Medical School · Year 3 · Family Medicine · includes a quiz and discussion video

Seminar 15: Office Procedures

Family Medicine Clerkship

Learning Objectives

By the end of this seminar, students will be able to:

1. Apply procedure selection principles including indication assessment, risk-benefit analysis, informed consent, and documentation standards
2. Administer local anesthesia safely using appropriate agents, techniques, and dosing calculations while recognizing complications
3. Perform skin lesion biopsies including shave, punch, and elliptical excision techniques with correct specimen handling
4. Execute cryotherapy and joint injections with proper technique, patient preparation, and post-procedure management
5. Assess wounds systematically and perform appropriate wound closure including suture selection, placement, and removal timing
6. Recognize procedural complications promptly and determine when specialist referral is indicated

Seminar Outline

Section 1: Principles of Office Procedures

The decision to perform an office procedure requires systematic evaluation of multiple factors to ensure patient safety and appropriate care. The indication for the procedure must be clearly established, whether diagnostic, therapeutic, or cosmetic, and the expected benefit must justify the inherent risks. A patient-specific risk assessment should consider comorbidities that may affect healing or increase complication risk, including diabetes, immunosuppression, anticoagulant use, and peripheral vascular disease. The clinician must honestly assess their own competency and experience with the planned procedure, recognizing that performing procedures beyond one's training level places patients at risk. Equipment availability and functionality must be confirmed before the procedure begins, including backup supplies for unexpected findings. The clinical setting must be appropriate, with adequate lighting, sterile supplies, and emergency equipment including epinephrine and resuscitation supplies. A contingency plan for complications, including arrangements for specialist consultation or emergency transfer, should be in place before any procedure is initiated.

Informed consent is both an ethical obligation and a legal requirement for all office procedures and must be obtained before beginning any intervention. The consent discussion should explain the nature of the procedure in language the patient can understand, avoiding excessive medical jargon while providing sufficient detail for genuine informed decision-making. The risks of the procedure, including both common minor complications and rare but serious ones, must be disclosed honestly, and the specific risks most relevant to the planned procedure should be emphasized. The expected benefits and realistic outcomes should be discussed, avoiding promises of specific results. Available alternatives, including the option of no intervention, must be presented so the patient can make a fully informed choice. The patient should be given the opportunity to ask questions and express concerns, and their questions should be answered thoroughly. Written consent documentation should be completed and signed by the patient, with the discussion noted in the medical record, and a copy of the consent form provided to the patient.

Universal precautions must be observed during all office procedures to protect both the patient and the healthcare team. Hand hygiene with soap and water or alcohol-based hand sanitizer should be performed immediately before and after every procedure, even when gloves are worn, as gloves may have microscopic defects that allow pathogen transmission. Appropriate gloves, sterile for procedures involving normally sterile tissue and clean for minor procedures, must be worn throughout. Eye protection with safety glasses or a face shield should be used whenever there is risk of splash or spray of blood or body fluids. Sharps safety is paramount, with all needles, blades, and sharp instruments disposed of immediately after use in puncture-resistant sharps containers without recapping needles. The exposure management protocol, including the location of post-exposure prophylaxis resources and the process for reporting needlestick injuries, should be known by all team members before beginning any procedure.

Thorough documentation of every office procedure serves both clinical and medicolegal functions and should be completed promptly while details are fresh. The documentation should record the indication that prompted the procedure, establishing the medical necessity for the intervention. The consent process should be documented, including a notation that risks, benefits, and alternatives were discussed and that the patient provided voluntary written consent. A description of the technique employed should include the type and amount of anesthetic used, the instruments and approach utilized, and a step-by-step account of the procedure itself. Findings during the procedure, including the appearance, size, and characteristics of any lesions or abnormalities, should be recorded. If specimens were obtained, the documentation should note that they were labeled, placed in appropriate fixative, and submitted for pathologic analysis with a completed requisition. Any complications or adverse events during or immediately after the procedure should be described with the response taken. Post-procedure instructions given to the patient, including wound care, activity restrictions, signs of complications to watch for, and follow-up timing, should be documented as having been provided and understood.

<image>Panel A: Procedure selection decision framework showing indication assessment, patient-specific risk factors (diabetes, immunosuppression, anticoagulation), clinician competency self-assessment, equipment checklist, setting appropriateness, and complication contingency planning. Panel B: Informed consent elements showing the nature of the procedure, risks (common and serious), benefits, alternatives including no treatment, patient questions opportunity, and written documentation requirements with sample consent form elements. Panel C: Universal precautions during office procedures showing hand hygiene technique and timing, glove selection (sterile versus clean), eye protection indications, sharps safety with no-recapping policy, and exposure management protocol steps. Panel D: Procedure documentation template showing indication, consent notation, anesthesia details, technique description, findings, specimen handling and pathology submission, complications with response, and patient instructions with follow-up plan.</image>

Section 2: Local Anesthesia

Local anesthetic agents differ in their onset of action, duration of effect, and maximum safe dosage, and selection should be matched to the specific procedural requirements. Lidocaine one percent, the most commonly used agent, has a rapid onset within one to two minutes and a duration of one to two hours without epinephrine, with a maximum dose of 4.5 milligrams per kilogram. The practical calculation for lidocaine is straightforward: a one percent solution contains ten milligrams per milliliter, so a seventy-kilogram patient can safely receive up to approximately thirty milliliters of one percent lidocaine without epinephrine. Lidocaine with epinephrine extends the duration to two to four hours, increases the maximum dose to seven milligrams per kilogram through reduced systemic absorption, and provides local hemostasis, making it the preferred formulation for most procedures. Bupivacaine 0.25 percent has a slower onset of approximately five to ten minutes but provides prolonged anesthesia lasting four to eight hours, making it suitable for procedures where extended post-procedural pain control is desired, with a maximum dose of 2.5 milligrams per kilogram. Mixing lidocaine and bupivacaine combines rapid onset with prolonged duration.

Epinephrine is commonly added to local anesthetics at a concentration of one to one hundred thousand and provides several important advantages. Its vasoconstrictive effect reduces bleeding at the operative site, improving visualization during the procedure. By decreasing the rate of systemic absorption, epinephrine both prolongs the duration of local anesthesia and increases the maximum safe dose that can be administered. The traditional teaching that epinephrine should be avoided in areas with end-arteries, specifically the fingers, toes, nose, ears, and penis, has been substantially reconsidered in recent years. Large observational studies and systematic reviews have demonstrated that low concentrations of lidocaine with epinephrine are safe for digital blocks, and this combination is now commonly used in emergency departments and hand surgery. However, epinephrine should be avoided in patients with severe peripheral vascular disease, in skin flaps with tenuous blood supply, and when tissue viability is already compromised.

Several injection techniques for local anesthesia are employed depending on the location and nature of the procedure. Local infiltration involves injecting the anesthetic directly into and around the tissue to be operated upon, and is the most commonly used technique for wound repair and lesion excision. A field block involves injecting anesthetic in a ring around the operative site rather than directly into it, which is useful when injection into the lesion itself might distort anatomy or introduce bacteria into a sterile field. Digital nerve blocks provide complete anesthesia of a finger or toe through injection at the base of the digit, blocking the two dorsal and two volar digital nerves, and are ideal for procedures involving the distal digit including nail procedures, laceration repair, and foreign body removal. Injection technique modifications that reduce patient discomfort include using the smallest gauge needle practical, injecting slowly with steady pressure, entering through existing wounds when possible, buffering lidocaine with sodium bicarbonate at a ratio of approximately one part bicarbonate to ten parts lidocaine to reduce the acidity that causes stinging, and warming the anesthetic to body temperature.

Complications of local anesthesia are uncommon but must be recognized and managed promptly. True allergic reactions to amide-type anesthetics such as lidocaine are extremely rare, and most reported allergies are actually reactions to preservatives, vasovagal episodes, or anxiety-related symptoms. Systemic toxicity from excessive dosing manifests initially with central nervous system symptoms including perioral numbness, metallic taste, tinnitus, visual disturbance, and agitation, progressing to seizures and cardiovascular collapse with severe overdose. Management involves immediate cessation of injection, airway management, benzodiazepines for seizures, and lipid emulsion therapy for severe cardiac toxicity. Vasovagal syncope is the most common adverse event during office procedures, presenting with lightheadedness, nausea, diaphoresis, and bradycardia, and is managed by placing the patient supine with legs elevated, applying cool compresses, and providing reassurance. Hematoma formation at the injection site is managed with direct pressure. Preventing complications through careful dose calculation, aspiration before injection to avoid intravascular delivery, slow injection technique, and maintaining a calm, communicative approach with the patient is far preferable to managing them after they occur.

<image>Panel A: Local anesthetic agent comparison showing lidocaine one percent (rapid onset, one-to-two-hour duration, 4.5 milligrams per kilogram maximum), lidocaine with epinephrine (two-to-four-hour duration, seven milligrams per kilogram maximum), and bupivacaine 0.25 percent (slower onset, four-to-eight-hour duration, 2.5 milligrams per kilogram maximum) with dose calculation examples. Panel B: Epinephrine benefits and considerations showing vasoconstriction for hemostasis, prolonged duration, increased safe dose, the reconsidered evidence for digital use, and remaining contraindications including severe PVD and compromised tissue viability. Panel C: Injection technique illustrations showing local infiltration around a wound, field block with circumferential injection, digital nerve block at the base of the finger with four-point injection anatomy, and pain-reduction strategies including small gauge needle, slow injection, bicarbonate buffering, and warming. Panel D: Complication recognition and management showing allergic reaction rarity, systemic toxicity progression from CNS symptoms to seizures and cardiovascular collapse with lipid emulsion therapy, vasovagal syncope management with supine positioning, and hematoma treatment with pressure.</image>

Section 3: Skin Lesion Removal

Skin biopsy techniques are selected based on the clinical indication, the suspected diagnosis, and the depth of tissue sampling required for accurate pathologic evaluation. Shave biopsy involves tangential removal of a raised or superficial lesion using a blade held parallel to the skin surface and is appropriate for raised benign lesions such as skin tags and seborrheic keratoses, as well as for superficial diagnostic biopsies where full-thickness sampling is not required. Punch biopsy uses a circular cutting instrument that penetrates through the full thickness of the dermis into the subcutaneous fat and provides excellent tissue architecture for histopathologic diagnosis; it is appropriate for flat or inflammatory lesions, suspected inflammatory dermatoses, and lesions where depth assessment is clinically important. Excisional biopsy involves complete removal of a lesion with surrounding margins using an elliptical incision and is the preferred technique when malignancy is suspected because it provides both a definitive diagnosis and, when margins are adequate, serves as definitive treatment. Incisional biopsy removes a representative portion of a larger lesion for diagnostic purposes and is used when the lesion is too large for complete excision in the office or when the diagnosis must be established before definitive surgical planning.

The shave biopsy technique begins with appropriate anesthesia, typically achieved by infiltrating local anesthetic beneath the lesion to elevate it from the surrounding skin, which simultaneously provides pain control and facilitates tangential removal. The instrument, which may be a number fifteen scalpel blade, a flexible dermablade, or a specialized shave blade, is held parallel to the skin surface and drawn through the base of the lesion in a smooth, controlled motion. The depth of the shave is adjusted based on the clinical scenario: a superficial shave for clearly benign lesions being removed for cosmetic reasons, and a deeper saucerized shave for diagnostic biopsies where adequate tissue depth is needed for histopathologic evaluation. Hemostasis is achieved with aluminum chloride solution applied with a cotton-tipped applicator, electrocautery, or ferric subsulfate depending on the amount of bleeding and available equipment. The specimen is placed in ten percent buffered formalin and submitted with a completed pathology requisition describing the clinical appearance, location, and differential diagnosis. Wound care consists of daily application of petrolatum ointment and a bandage until re-epithelialization is complete, typically within one to three weeks, and patients should be informed that the wound will heal with a slightly depressed or discolored scar.

Punch biopsy requires selection of an appropriately sized punch instrument, with three to four millimeter punches being most commonly used for diagnostic biopsies. After infiltrating anesthesia around but not directly into the lesion to avoid histologic artifact, the punch is placed perpendicular to the skin surface centered on the most representative area of the lesion, and firm downward pressure with a twisting motion is applied until the instrument is felt to penetrate through the dermis into subcutaneous fat. The cylindrical tissue core is grasped gently with fine forceps, avoiding crush artifact, and severed at its base with iris scissors. Hemostasis may be achieved by direct pressure alone for small biopsies, or a single interrupted absorbable suture may be placed for larger punch sites. For punch biopsies of four millimeters or larger, closure with suture is generally recommended to optimize cosmesis and reduce healing time. The tissue specimen is oriented if clinically relevant, placed in formalin, and submitted with clinical information.

Elliptical excision is the technique of choice when complete removal of a lesion with clear margins is the goal, such as for suspected melanoma, squamous cell carcinoma, or other malignancies. The excision margins are determined by the suspected diagnosis, with narrow margins of one to two millimeters for benign lesions and wider margins for suspected malignancies as guided by clinical practice guidelines. The ellipse is oriented along relaxed skin tension lines to optimize cosmetic outcome and is designed with a length-to-width ratio of three-to-one or four-to-one to prevent standing cutaneous deformities, commonly known as dog ears, at the ends of the closure. The excision extends to the depth of the subcutaneous fat, and undermining of the wound edges in the plane of the superficial subcutaneous fat may be necessary to reduce tension on the closure. Closure is performed in layers when the wound is deep, with buried absorbable sutures in the deep dermis to reduce dead space and tension, followed by skin closure with interrupted or running non-absorbable sutures or subcuticular absorbable sutures for optimal cosmesis. The specimen should be oriented with a marking suture and submitted with a diagram indicating the anatomic orientation for the pathologist.

<image>Panel A: Biopsy technique selection guide showing shave biopsy for raised and superficial lesions, punch biopsy for flat and inflammatory lesions requiring full-thickness analysis, excisional biopsy for suspected malignancy with margins, and incisional biopsy for large lesions requiring diagnostic sampling, with clinical examples for each. Panel B: Shave biopsy step-by-step showing sublesional anesthetic infiltration creating elevation, blade orientation parallel to skin surface, tangential removal technique, hemostasis with aluminum chloride, specimen placement in formalin, and wound care with petrolatum and bandage. Panel C: Punch biopsy procedure showing three-to-four-millimeter punch selection, perpendicular placement with twisting downward pressure, tissue retrieval with gentle forceps handling avoiding crush, base severance with scissors, suture closure for larger punches, and specimen submission with clinical information. Panel D: Elliptical excision principles showing margin determination by suspected diagnosis, orientation along relaxed skin tension lines, three-to-one length-to-width ratio design, full-thickness excision to subcutaneous fat, undermining technique, layered closure with deep absorbable and superficial non-absorbable sutures, and specimen orientation with marking suture.</image>

Section 4: Cryotherapy

Cryotherapy utilizes the tissue-destructive properties of extreme cold to treat a variety of benign and precancerous skin lesions in the office setting. Common indications include verrucae (warts) of all types including common, plantar, and flat warts, actinic keratoses that represent precancerous lesions on sun-exposed skin, seborrheic keratoses when symptomatic or cosmetically bothersome, small skin tags, and molluscum contagiosum. The mechanism of tissue destruction involves rapid freezing that creates intracellular and extracellular ice crystals, causing direct cell membrane damage, osmotic injury from the freeze-thaw cycle, and ischemic necrosis from microvascular thrombosis during thawing. The depth of tissue destruction is proportional to the duration and number of freeze-thaw cycles. Cryotherapy is contraindicated in areas with compromised circulation, in patients with cryoglobulinemia or cold urticaria, and should be used with caution on lesions overlying superficial nerves.

The technique of liquid nitrogen cryotherapy requires attention to several parameters to achieve adequate tissue destruction while minimizing collateral damage. Liquid nitrogen at a temperature of negative one hundred ninety-six degrees Celsius may be applied using a spray device, which allows precise targeting and is preferred for most lesions, or a cotton-tipped applicator, which provides less precise application but is adequate for small superficial lesions. The freeze time varies by lesion type and thickness, generally ranging from ten to thirty seconds, with warts and actinic keratoses typically requiring longer freeze times than seborrheic keratoses. One to two freeze-thaw cycles are standard, with two cycles providing deeper destruction for thicker lesions. A margin of one to two millimeters of frozen tissue surrounding the lesion ensures treatment of the visible and microscopic edges. The endpoint of adequate treatment is the development of a white, frozen halo extending slightly beyond the lesion margins. Patients should be instructed not to break or unroof any blisters that form, and those with multiple or recurrent lesions may need repeat treatments at two to four week intervals.

The expected clinical course following cryotherapy follows a predictable progression that should be communicated to patients before treatment to set appropriate expectations. Immediately after treatment, the patient experiences stinging or burning that typically resolves within minutes. Over the following twenty-four to forty-eight hours, an edematous response develops, frequently progressing to blister formation, which may be clear or hemorrhagic and represents the inflammatory response to tissue destruction. The blister dries and forms an eschar over one to two weeks, and the treated tissue separates and sloughs over two to four weeks, revealing new epithelium underneath. Complete healing may take several weeks, and for some lesions, particularly thicker warts and actinic keratoses, multiple treatment sessions at two to four week intervals may be necessary to achieve complete resolution. Patients should be counseled that the goal is controlled tissue destruction, and the expected clinical course, while sometimes appearing concerning, is the normal healing process.

Complications of cryotherapy are generally minor but should be discussed during informed consent. Pain during and shortly after the procedure is the most common side effect and is usually brief and tolerable; patients with low pain thresholds may benefit from pre-treatment with topical anesthetic cream, though this is rarely necessary. Blister formation is an expected effect rather than a complication, though hemorrhagic blisters can be alarming to patients and should be anticipated in the consent discussion. Hypopigmentation at the treatment site is the most significant cosmetic concern and is more likely to occur in patients with darker skin tones due to melanocyte destruction; this risk should be explicitly discussed with patients of color, and alternative treatment modalities may be preferred. Temporary hyperpigmentation may also occur and usually resolves over months. Nerve damage is rare but can occur when treating lesions overlying superficial nerves, particularly along the lateral digits and the ulnar nerve at the elbow, producing temporary or rarely permanent numbness. Scarring is possible, particularly with aggressive treatment, prolonged freeze times, or multiple treatment sessions.

<image>Panel A: Cryotherapy indications showing warts (common, plantar, flat), actinic keratoses, seborrheic keratoses, skin tags, and molluscum with contraindications including compromised circulation, cryoglobulinemia, and cold urticaria, plus the mechanism of tissue destruction through ice crystal formation and microvascular thrombosis. Panel B: Liquid nitrogen application technique showing spray device aimed at lesion with one-to-two-millimeter margin, cotton-tipped applicator alternative, freeze time ranges by lesion type (ten to thirty seconds), one-to-two freeze-thaw cycles, and the white frozen halo endpoint of adequate treatment. Panel C: Expected clinical course timeline showing immediate stinging, twenty-four to forty-eight-hour blister formation (clear or hemorrhagic), one-to-two-week eschar formation, two-to-four-week tissue separation, and complete healing with indication for repeat treatment at two-to-four-week intervals if needed. Panel D: Complications including expected pain management, hemorrhagic blister reassurance, hypopigmentation risk particularly in darker skin with pre-treatment discussion recommendations, hyperpigmentation resolution timeline, nerve damage risk near superficial nerves, and scarring potential with aggressive treatment.</image>

Section 5: Joint and Soft Tissue Injections

Joint and soft tissue corticosteroid injections are among the most commonly performed office procedures in primary care and provide targeted anti-inflammatory relief for a variety of musculoskeletal conditions. The knee joint is the most frequently injected site, with indications including osteoarthritis flare, inflammatory arthritis, and bursitis. The subacromial space is injected for subacromial bursitis, rotator cuff tendinopathy, and adhesive capsulitis. Lateral epicondyle injection treats lateral epicondylitis when conservative measures have failed. The wrist is injected for de Quervain tenosynovitis at the first dorsal compartment and for carpal tunnel syndrome at the carpal tunnel. Trigger finger injection targets the flexor tendon sheath at the A1 pulley. Greater trochanteric bursa injection treats trochanteric bursitis. Each injection site has specific anatomic landmarks, approach angles, and depth considerations that must be understood before the procedure is attempted, and landmark-guided injection remains the standard technique in primary care, though ultrasound guidance is increasingly available and improves accuracy for difficult injections.

The knee joint injection is one of the most straightforward and commonly performed procedures in primary care. The patient is positioned supine or seated with the knee extended or in slight flexion. The superolateral approach, entering one centimeter above and one centimeter lateral to the superior-lateral pole of the patella, is the most commonly used entry point, directing the needle at a forty-five-degree angle toward the intercondylar notch. An alternative inferomedial approach enters at the midpoint of the medial border of the patella, directing the needle horizontally beneath the patella. A twenty-two-gauge, one-and-a-half-inch needle is typically used. If joint effusion is present, aspiration should be performed before injection to remove excess fluid for both diagnostic and therapeutic purposes, with the fluid sent for cell count, crystal analysis, Gram stain, and culture when infection is a diagnostic consideration. The injection typically consists of a combination of one to two milliliters of corticosteroid (such as triamcinolone acetonide forty milligrams per milliliter or methylprednisolone acetate forty milligrams per milliliter) with one to three milliliters of lidocaine one percent for immediate pain relief.

The subacromial injection targets the space between the acromion and the rotator cuff and is performed for subacromial bursitis and rotator cuff tendinopathy. The patient is seated with the arm relaxed at the side or resting on the lap. The posterior approach enters two to three centimeters below and medial to the posterolateral corner of the acromion, directing the needle anteriorly and slightly superiorly toward the subacromial space. The lateral approach enters approximately two centimeters below the lateral edge of the acromion, directing the needle medially and slightly superiorly. A twenty-two-gauge, one-and-a-half-inch needle is used, and the needle should pass smoothly into the subacromial space without encountering significant resistance; bony resistance indicates contact with the acromion or humeral head and requires repositioning. The injection contains one milliliter of corticosteroid combined with two to three milliliters of lidocaine. The relief of pain immediately following injection with lidocaine serves as a diagnostic confirmation that the corticosteroid was correctly delivered into the subacromial space.

General principles applicable to all corticosteroid injections ensure safety, efficacy, and appropriate follow-up. Sterile technique must be maintained throughout, with the skin prepared using alcohol or chlorhexidine and allowed to dry before needle insertion. Aspiration before injection is recommended to confirm the needle is not positioned intravascularly, with repositioning required if blood is aspirated. The frequency of injections should be limited to three to four per year per site, as repeated corticosteroid exposure can cause tendon weakening, cartilage damage, and subcutaneous fat atrophy. Patients should be counseled about the possibility of a post-injection flare, a transient increase in pain occurring twelve to thirty-six hours after injection that resolves within forty-eight hours and is managed with ice and analgesics. Although infection following corticosteroid injection is rare, occurring in fewer than one in ten thousand procedures, patients should be instructed to seek evaluation for worsening pain, fever, warmth, or swelling after the first forty-eight hours, as these symptoms may indicate septic arthritis requiring urgent drainage and antibiotics. Patients with diabetes should be warned that corticosteroid injection may transiently elevate blood glucose levels for several days.

<image>Panel A: Common injection sites with indications showing knee (osteoarthritis, bursitis), shoulder subacromial space (bursitis, rotator cuff tendinopathy), lateral epicondyle (lateral epicondylitis), wrist (de Quervain, carpal tunnel), trigger finger (flexor sheath at A1 pulley), and greater trochanter (bursitis). Panel B: Knee injection technique showing superolateral approach landmarks (one centimeter above and lateral to patella), needle angle toward intercondylar notch, aspiration technique for effusion with fluid analysis considerations, and injection mixture of corticosteroid plus lidocaine with specific dosing. Panel C: Subacromial injection showing posterior and lateral approach landmarks, needle direction toward subacromial space, bony resistance as a repositioning indicator, injection contents, and immediate lidocaine relief as diagnostic confirmation of correct placement. Panel D: General injection principles showing sterile skin preparation, aspiration before injection, frequency limit of three to four per year per site, post-injection flare counseling with ice and analgesics, infection warning signs (worsening pain, fever after forty-eight hours), and diabetic blood glucose elevation warning.</image>

Section 6: Wound Care

Systematic wound assessment guides all subsequent management decisions and must be thorough and methodical. The mechanism of injury determines the likelihood of contamination, tissue damage, and associated injuries: sharp wounds from knives or glass are typically clean-cut with minimal tissue destruction, crush injuries produce more devitalized tissue and have higher infection risk, and bite wounds introduce polymicrobial flora and carry specific infection concerns. The anatomic location affects both cosmetic and functional considerations, with facial wounds requiring meticulous closure for cosmesis and wounds near tendons, nerves, and vessels requiring careful exploration for deep structure injury. The degree of contamination, ranging from clean surgical wounds to heavily soiled traumatic wounds, influences the decision to close primarily versus allowing secondary healing. Wound depth must be assessed by exploring the wound under adequate anesthesia and lighting to identify involvement of subcutaneous tissue, fascia, muscle, tendon, nerve, or vessel. The time since injury affects tissue viability and infection risk, with longer delays reducing the safety of primary closure. Patient factors including immunocompromise, diabetes, vascular disease, and nutritional status influence healing potential and infection risk.

Wound preparation is essential for reducing infection risk and optimizing healing outcomes. Anesthesia should be administered before wound cleaning, as adequate pain control allows thorough irrigation and exploration that might otherwise be limited by patient discomfort. High-volume irrigation with normal saline or tap water under moderate pressure, delivered through a thirty-five-milliliter syringe with an eighteen-gauge needle or splash shield, is the most effective method for reducing bacterial contamination and is superior to soaking, scrubbing, or low-pressure irrigation. A minimum of one hundred fifty to two hundred milliliters of irrigant is recommended for most wounds, with larger or more contaminated wounds requiring proportionally more. Debridement of devitalized, crushed, or necrotic tissue removes the substrate for bacterial growth and creates wound edges that can be accurately approximated for closure. Wound exploration under adequate anesthesia and lighting should be performed to identify foreign bodies, tendon lacerations that may require surgical repair, and neurovascular injury. Hemostasis is achieved through direct pressure as the first-line technique, with electrocautery or suture ligation reserved for persistent bleeding from identifiable vessels.

The decision between primary closure, delayed primary closure, and secondary intention healing is guided by wound characteristics, time since injury, and infection risk. Primary closure, the immediate approximation of wound edges with sutures, staples, or adhesive, is appropriate for clean wounds presenting within the generally accepted time window of six to twelve hours for body wounds and up to twenty-four hours for facial wounds, which benefit from the rich blood supply of the face. Delayed primary closure, in which the wound is left open, packed with moist gauze, and closed three to five days later after confirming the absence of infection, is appropriate for contaminated wounds where immediate closure would trap bacteria. Secondary intention healing, in which the wound is allowed to heal by granulation, contraction, and epithelialization without surgical closure, is appropriate for infected wounds, certain anatomic locations where cosmesis is less critical, and small superficial wounds that will heal satisfactorily without closure. Bite wounds are generally left open due to their high bacterial burden, with the notable exception of facial bite wounds, which may be closed after thorough irrigation due to cosmetic concerns and the excellent vascularity of the face.

Tetanus prophylaxis is required for wound management and should be assessed for every patient presenting with a wound. The tetanus vaccination status determines the need for tetanus toxoid-containing vaccine and tetanus immune globulin. For clean, minor wounds, patients who have received fewer than three doses of tetanus toxoid should receive Tdap or Td vaccine, while those with three or more doses need a booster only if it has been more than ten years since their last dose. For all other wounds, including those that are contaminated, puncture, avulsive, or contain devitalized tissue, patients with fewer than three doses should receive both Tdap and tetanus immune globulin, while those with three or more doses need a booster if more than five years have elapsed since their last dose. Tdap is preferred over Td when the patient has not previously received Tdap, providing the additional benefit of pertussis protection. Documentation of the tetanus prophylaxis administered, or the rationale for deferral, should be included in the wound care record.

<image>Panel A: Wound assessment systematic approach showing mechanism evaluation (sharp, crush, bite), anatomic location functional and cosmetic considerations, contamination degree classification, depth exploration for deep structure injury, time-since-injury impact, and patient healing risk factors (diabetes, immunosuppression, vascular disease). Panel B: Wound preparation steps showing anesthesia-first approach, high-volume irrigation technique with syringe and needle pressure specifications, minimum irrigation volume, debridement of devitalized tissue, wound exploration for foreign bodies and tendon injury, and hemostasis methods from direct pressure to electrocautery. Panel C: Closure decision algorithm showing primary closure criteria (clean wounds, six-to-twelve-hour window, twenty-four hours for face), delayed primary closure for contaminated wounds (open three-to-five days then close), secondary intention for infected wounds, and bite wound management with the facial exception for primary closure after thorough irrigation. Panel D: Tetanus prophylaxis decision matrix showing clean minor wounds versus all other wounds, vaccination status (fewer than three doses versus three or more doses), Tdap or Td vaccine indications, tetanus immune globulin criteria, and time-since-last-dose thresholds of ten years and five years respectively.</image>

Section 7: Suturing

Suture material selection is guided by the tissue layer being closed, the required tensile strength and duration, and the cosmetic demands of the wound location. Absorbable sutures including polyglactin (Vicryl) and poliglecaprone (Monocryl) are used for deep dermal layers, subcutaneous tissue, and mucous membranes where suture removal would be impractical or unnecessary. Non-absorbable sutures including nylon (Ethilon) and polypropylene (Prolene) are the standard choice for skin surface closure because they provide predictable tensile strength, cause minimal tissue reaction, and are easily removed at the appropriate time. Suture size is selected based on the anatomic location and the tension on the wound: three-zero to five-zero sutures are appropriate for most body and extremity wounds, while six-zero suture is used for facial wounds where minimal scarring is the priority. Needle selection follows the tissue type, with cutting needles that have a sharp triangular cross-section used for skin, and taper-point needles with a smooth round cross-section used for fascia and deeper soft tissues where tearing is undesirable.

Multiple suture techniques are available, each suited to specific clinical situations and wound characteristics. The simple interrupted suture is the most versatile and commonly used technique, providing precise wound edge approximation with each individually placed and tied suture functioning independently so that removal of one does not affect the others. The horizontal mattress suture provides excellent wound edge eversion and is particularly useful for wounds under tension, on the scalp, and on the back of the hand. The vertical mattress suture combines deep and superficial tissue approximation in a single suture, providing both eversion and tension relief, and is useful when layered closure is not feasible. The simple running or continuous suture provides rapid closure for long wounds under minimal tension, with the limitation that disruption of any portion of the suture compromises the entire closure. The subcuticular running suture provides the best cosmetic result for linear wounds, as there are no visible surface suture marks, and is often used for facial wounds and in cosmetically sensitive areas. Deep or buried dermal sutures placed in the dermis with the knot buried in the deep tissue provide tension relief for the superficial closure and reduce dead space.

Proper tissue handling during suturing directly impacts wound healing and scar formation. The fundamental goal is eversion of the wound edges, meaning the edges should be slightly raised above the surrounding skin surface, as this compensates for the natural tendency of wounds to contract and flatten during healing, ultimately producing a flat scar. Each bite of the suture should be equal in depth and width on both sides of the wound to achieve symmetric approximation, and the needle should enter and exit the skin perpendicular to the surface to achieve adequate depth. Dead space within the wound should be eliminated through layered closure, as fluid collections in dead space serve as a medium for bacterial growth and impede healing. Tissue should be handled gently, using fine-toothed forceps to grasp the dermis rather than the epidermis, and avoiding excessive crushing or tearing that devitalizes tissue. Suture tension should approximate the wound edges without strangulating the tissue, as excessive tension causes tissue ischemia, necrosis, and increased scarring, while insufficient tension allows wound edge separation and poor cosmesis.

Suture removal timing is determined by the anatomic location and the expected rate of wound healing at that site. Facial sutures are removed earliest, at three to five days, because the excellent blood supply of the face allows rapid healing and prolonged suture retention causes visible suture marks that detract from cosmesis. Scalp sutures are removed at seven to ten days. Trunk and upper extremity sutures are removed at seven to ten days. Lower extremity sutures, where blood supply is relatively poorer and wounds heal more slowly, are removed at ten to fourteen days. Wounds that cross joints require longer suture retention of approximately fourteen days due to the mechanical stress of joint movement. For longer wounds, alternate suture removal, in which every other suture is removed first with wound integrity assessed before removing the remaining sutures, reduces the risk of wound dehiscence from premature removal. Adhesive wound closure strips applied after suture removal provide additional wound support during the early remodeling phase and are particularly useful for wounds under tension.

<image>Panel A: Suture material selection showing absorbable options (Vicryl, Monocryl) for deep layers and mucosa, non-absorbable options (nylon, Prolene) for skin closure, suture size by anatomic location (three-zero to five-zero for body, six-zero for face), and needle type selection (cutting for skin, taper for fascia). Panel B: Suture technique illustrations showing simple interrupted with individual placement, horizontal mattress for eversion and tension, vertical mattress combining deep and superficial, running continuous for rapid low-tension closure, subcuticular for cosmesis, and buried dermal for tension relief and dead space elimination. Panel C: Tissue handling principles showing wound edge eversion goal with cross-sectional diagram, equal depth and width bite technique, perpendicular needle entry, dead space elimination through layered closure, gentle tissue handling with forceps, and appropriate tension avoiding strangulation. Panel D: Suture removal timing by anatomic location showing face at three to five days, scalp at seven to ten days, trunk at seven to ten days, lower extremity at ten to fourteen days, over joints at fourteen days, alternate removal technique for longer wounds, and adhesive strip application after removal.</image>

Section 8: Other Common Procedures

Abscess incision and drainage is the definitive treatment for cutaneous abscesses and should be performed whenever a fluctuant collection is identified. The procedure begins with establishing a sterile field and providing adequate anesthesia, typically through a field block around the abscess periphery rather than directly into the inflamed tissue, which is poorly responsive to local anesthesia due to the acidic environment. A linear incision is made over the point of maximal fluctuance, extending the full length of the abscess cavity to ensure adequate drainage. After the initial purulent material is expressed, the cavity is explored with a hemostat to break up any loculations or septations that could harbor undrained pockets of infection. The cavity is irrigated with sterile saline to remove residual purulent material. For larger or deeper abscesses, gauze packing is inserted to prevent premature closure of the skin incision and to promote drainage from the base of the cavity outward. Follow-up for packing removal and wound reassessment should be scheduled within twenty-four to forty-eight hours, with repacking as needed until the cavity has contracted sufficiently to heal by secondary intention.

Management of ingrown toenails ranges from conservative measures for mild cases to partial or total nail avulsion with matricectomy for recurrent disease. A digital block using lidocaine without epinephrine (or with epinephrine, given current evidence supporting its safety in digits) provides complete anesthesia of the affected toe. For partial nail avulsion, the ingrown portion of the nail is separated from the nail bed using a nail elevator and then cut longitudinally from the distal edge to the nail matrix using nail-splitting scissors, with the separated segment removed. Chemical matricectomy with eighty-nine percent phenol applied to the exposed nail matrix for thirty to sixty seconds destroys the germinal tissue and prevents regrowth of the offending nail edge, significantly reducing recurrence rates from approximately eighty percent with avulsion alone to approximately five percent with phenol matricectomy. Aftercare includes daily warm soaks, application of topical antibiotic ointment, and appropriate wound dressing until healed. Systemic antibiotics are indicated only when concurrent cellulitis or significant infection is present.

Cerumen removal is indicated when impacted cerumen causes hearing loss, otalgia, tinnitus, or prevents adequate visualization of the tympanic membrane for otoscopic examination. Curette removal under direct visualization is the most controlled method, using a cerumen loop or spoon inserted along the canal wall under otoscopic guidance to scoop or pull the cerumen outward. Irrigation with body-temperature water delivered through a specialized ear syringe or electronic irrigator is effective for soft cerumen but is contraindicated in patients with tympanic membrane perforation, pressure equalization tubes, or suspected otitis externa. Suction removal using specialized microsuction equipment provides precise removal under direct visualization and is the safest method for patients with perforated eardrums. Cerumen-softening agents such as mineral oil, hydrogen peroxide, or commercial preparations may be instilled for several days before removal to soften hard, impacted cerumen and improve the success of subsequent removal. Patients should be counseled to avoid insertion of cotton-tipped applicators or other objects into the ear canal, as these typically push cerumen deeper and can damage the canal or tympanic membrane.

Subungual hematoma drainage provides immediate relief of the severe throbbing pain caused by blood trapped beneath the toenail or fingernail following trauma. The procedure involves trephination, the creation of a hole through the nail plate to allow the trapped blood to drain. The traditional technique uses a heated paper clip or cautery device held perpendicular to the nail surface and gently melted or burned through the nail at the point of maximum discoloration, with cessation of downward pressure immediately upon penetration through the nail, evidenced by sudden release of blood and immediate pain relief. An eighteen-gauge needle may alternatively be used with a twisting motion to bore through the nail. No anesthesia is required when using the thermal technique, as the nail plate is insensate. The procedure is indicated when the hematoma involves more than twenty-five to fifty percent of the nail surface and the patient is experiencing significant pain. If the nail margins are intact and the nail plate is not avulsed, trephination alone is adequate. However, if a subungual laceration is suspected based on nail plate disruption, nail avulsion and direct repair of the nail bed may be necessary and should be performed by or in consultation with a hand surgeon.

<image>Panel A: Abscess incision and drainage showing field block anesthesia around the periphery, linear incision over fluctuant point, hemostat exploration to break loculations, saline irrigation, gauze packing insertion for deeper cavities, and twenty-four to forty-eight-hour follow-up for packing removal and reassessment. Panel B: Ingrown toenail management showing digital block technique, partial nail avulsion with nail elevator and splitting scissors, phenol matricectomy at eighty-nine percent concentration for thirty to sixty seconds to prevent regrowth, aftercare with soaks and topical antibiotic, and recurrence rate reduction from eighty percent to five percent. Panel C: Cerumen removal methods showing curette technique under otoscopic visualization, irrigation with body-temperature water and contraindications (perforation, tubes, otitis externa), suction removal for perforated eardrums, softening agents pre-treatment, and patient counseling against cotton-tipped applicator use. Panel D: Subungual hematoma trephination showing heated paper clip technique perpendicular to nail surface, immediate cessation upon blood release, eighteen-gauge needle alternative, no-anesthesia advantage with thermal method, indications based on hematoma size and pain, and nail bed laceration assessment criteria for possible surgical repair.</image>

Section 9: Electrocardiogram and Spirometry

Systematic ECG interpretation follows a structured approach that ensures no abnormality is overlooked. Rate assessment determines whether the heart rate falls within the normal range of sixty to one hundred beats per minute, with bradycardia below sixty and tachycardia above one hundred. Rhythm assessment evaluates regularity of the QRS complexes and identifies the presence and relationship of P waves to QRS complexes, distinguishing sinus rhythm from atrial fibrillation, atrial flutter, and other arrhythmias. Axis determination places the mean QRS vector in one of four quadrants: normal (negative thirty to positive ninety degrees), left axis deviation (more negative than negative thirty degrees), right axis deviation (more positive than positive ninety degrees), or extreme axis deviation. Interval assessment measures the PR interval (normal 120 to 200 milliseconds), the QRS duration (normal less than 120 milliseconds), and the corrected QT interval (prolonged if greater than 450 milliseconds in men or 460 milliseconds in women). Segment and wave analysis evaluates for ST elevation or depression suggesting ischemia or infarction, pathologic Q waves indicating prior myocardial infarction, and T wave abnormalities including hyperacute peaks, inversions, and flattening.

Several common ECG findings encountered in primary care have important clinical implications. Sinus tachycardia, while not a primary cardiac abnormality, should prompt evaluation for underlying causes including fever, dehydration, pain, anxiety, hyperthyroidism, anemia, and heart failure. Atrial fibrillation, characterized by an irregularly irregular rhythm with absent P waves and a variable ventricular rate, is the most common sustained arrhythmia encountered in primary care and requires assessment for anticoagulation using the CHA2DS2-VASc score and rate or rhythm control based on symptoms and clinical circumstances. Left ventricular hypertrophy, identified by voltage criteria such as the Sokolow-Lyon index, suggests chronic pressure or volume overload and should prompt evaluation for hypertension and consideration of echocardiography. Pathologic Q waves greater than forty milliseconds wide and one-third the height of the R wave in the same lead indicate prior transmural myocardial infarction. ST segment changes, including elevation suggesting acute injury and depression suggesting ischemia or reciprocal changes, may also be caused by non-ischemic conditions including pericarditis, early repolarization, and electrolyte abnormalities.

Spirometry interpretation is based on three primary patterns that distinguish normal pulmonary function from obstructive and restrictive abnormalities. The normal pattern demonstrates an FEV1-to-FVC ratio of 0.70 or greater, with both FEV1 and FVC at or above eighty percent of predicted values based on age, sex, height, and ethnicity. The obstructive pattern, characteristic of asthma and chronic obstructive pulmonary disease, shows a reduced FEV1-to-FVC ratio below 0.70, indicating that a disproportionately small fraction of the total lung volume can be exhaled in the first second due to airflow limitation. FVC may be normal or reduced, and FEV1 is reduced, with the degree of FEV1 reduction determining severity classification. The restrictive pattern demonstrates a preserved or increased FEV1-to-FVC ratio of 0.70 or greater with a reduced FVC, indicating that total lung capacity is diminished but the airways themselves are not obstructed, as seen in interstitial lung disease, chest wall disorders, and neuromuscular disease. A mixed pattern shows features of both obstruction and restriction with a reduced ratio and disproportionately reduced FVC.

Spirometry is utilized in primary care for both diagnostic and monitoring purposes across a range of respiratory conditions. For asthma diagnosis, spirometry demonstrates reversible airflow obstruction with an improvement in FEV1 of twelve percent or greater and at least two hundred milliliters following bronchodilator administration. For COPD diagnosis, post-bronchodilator spirometry showing persistent airflow obstruction with an FEV1-to-FVC ratio below 0.70 confirms the diagnosis, with disease severity graded by the degree of FEV1 reduction. Monitoring disease progression through serial spirometry allows detection of accelerated lung function decline and assessment of treatment response. Pre-bronchodilator and post-bronchodilator testing together characterize both the baseline degree of obstruction and its reversibility. Quality spirometry requires good patient coaching with clear, enthusiastic instructions, at least three acceptable and reproducible efforts, and technician assessment of effort quality, as poor technique produces unreliable results that may lead to misdiagnosis or inappropriate treatment changes.

<image>Panel A: Systematic ECG interpretation steps showing rate assessment (bradycardia-normal-tachycardia), rhythm analysis (P wave presence, regularity), axis determination in four quadrants, interval measurement (PR, QRS, QTc) with normal values, and ST segment and wave analysis for ischemia, infarction, and T wave abnormalities. Panel B: Common ECG findings showing sinus tachycardia with differential diagnosis, atrial fibrillation with irregular rhythm and absent P waves, LVH voltage criteria, pathologic Q waves indicating prior MI, and ST changes distinguishing ischemic from non-ischemic causes. Panel C: Spirometry pattern interpretation showing normal (ratio at or above 0.70, FEV1 and FVC at or above eighty percent), obstructive (ratio below 0.70, reduced FEV1), restrictive (ratio at or above 0.70, reduced FVC), and mixed (reduced ratio with disproportionate FVC reduction) with flow-volume loop shapes for each. Panel D: Spirometry clinical applications showing asthma diagnosis with bronchodilator reversibility criteria (twelve percent and two hundred milliliters), COPD diagnosis with persistent obstruction, disease monitoring with serial testing, pre and post-bronchodilator testing protocol, and quality assurance with coaching technique and reproducibility standards.</image>

Section 10: Complications and When to Refer

Recognition of procedural complications requires vigilance during and after every office procedure, as early identification allows prompt intervention that minimizes morbidity. Wound infection, the most common post-procedural complication, manifests as increasing pain beginning two to three days after the procedure, progressive erythema extending beyond the wound margins, warmth, swelling, and purulent drainage, and may be accompanied by fever and regional lymphadenopathy. Hematoma formation presents as a firm, tender swelling at or beneath the wound closure, with discoloration of the surrounding skin, and may compromise wound healing by separating tissue planes and serving as a culture medium for bacteria. Wound dehiscence, the partial or complete separation of a previously closed wound, results from excessive tension, premature suture removal, infection, or inadequate tissue handling during closure. Nerve damage presents as numbness, paresthesias, or weakness in the distribution of the affected nerve and may result from direct injury during the procedure, local anesthetic injection, or compression from hematoma. Vascular injury manifests as persistent bleeding, expanding hematoma, or distal ischemic changes including pallor, pain, pulselessness, and coolness.

Management of complications should follow established protocols appropriate to the severity of the problem. Wound infection treatment includes opening the wound to allow drainage if there is a suspected underlying collection, irrigating the wound bed, initiating oral antibiotics directed at likely pathogens (staphylococcal and streptococcal species for most skin procedures), and scheduling close follow-up for reassessment. Small hematomas may be observed with compression and cold application, while larger hematomas should be evacuated by removing one or two sutures, expressing the collection, irrigating, and reclosing. Wound dehiscence management depends on the timing and extent: early partial dehiscence may be re-approximated with new sutures or adhesive strips, while complete dehiscence or dehiscence in the setting of infection should be managed with wound care and healing by secondary intention. Allergic reactions to local anesthesia or procedural materials are managed with antihistamines for mild reactions, intramuscular epinephrine for anaphylaxis, and documentation of the allergen for future avoidance.

Referral to a specialist is appropriate when a procedure exceeds the clinician's training or experience, when a complication arises that requires specialized management, or when the clinical findings during a procedure reveal pathology requiring advanced surgical expertise. Complex wounds involving tendons, nerves, vessels, or joints should be referred to plastic surgery, orthopedic surgery, or hand surgery depending on the structures involved and the anatomic location. Nerve or tendon lacerations require surgical repair by a specialist experienced with microsurgical or tendon repair techniques, as inadequate repair leads to permanent functional deficits. Suspected cutaneous malignancy, particularly melanoma, should be referred to dermatology or surgical oncology for definitive excision with appropriate margins and sentinel lymph node evaluation when indicated. Failed initial procedures, including incomplete excisions with positive margins, should be referred for re-excision by a specialist. The decision to refer is not an admission of inadequacy but rather a recognition that patient outcomes are optimized when procedures are performed by practitioners with the appropriate training and experience.

Quality improvement in office procedures requires ongoing self-assessment, outcome tracking, and commitment to maintaining and expanding procedural skills. Tracking complication rates for each procedure type allows identification of patterns that may indicate a technique problem, equipment issue, or patient selection concern that can be addressed through targeted improvement. Review of complications, ideally through a structured morbidity and mortality discussion format, promotes learning from adverse events and near-misses without a blame-focused culture. Continuing education through procedural workshops, simulation training, and proctored practice maintains and enhances skills, with particular attention to new techniques and evolving evidence about existing procedures. Recognizing the boundaries of one's competence and knowing when to refer rather than proceeding with a procedure beyond one's skill level is perhaps the most important quality measure. Patient feedback regarding their experience, including pain management, communication, and outcomes, provides valuable information for improving the procedural environment and patient satisfaction.

<image>Panel A: Complication recognition showing wound infection signs (increasing pain, progressive erythema, purulent drainage, fever), hematoma presentation (firm swelling, discoloration), dehiscence appearance (wound separation), nerve damage symptoms (numbness, paresthesias, weakness), and vascular injury signs (persistent bleeding, ischemic changes). Panel B: Complication management protocols showing wound infection treatment (open, irrigate, antibiotics, follow-up), hematoma management (observe small versus evacuate large), dehiscence approaches (re-approximate early versus secondary intention with infection), and allergic reaction treatment ladder from antihistamines to epinephrine. Panel C: Referral criteria showing complex wounds with deep structure involvement, nerve and tendon laceration requiring microsurgical repair, suspected malignancy requiring specialist excision and staging, failed initial procedures with positive margins, and the principle that referral optimizes patient outcomes. Panel D: Quality improvement framework showing complication rate tracking by procedure type, structured morbidity review process, continuing education activities (workshops, simulation, proctored practice), competency boundary awareness, and patient feedback integration for process improvement.</image>

Summary

• Informed consent requires discussion of the nature, risks, benefits, and alternatives of every procedure with documentation
• Lidocaine one percent contains ten milligrams per milliliter with a maximum dose of 4.5 milligrams per kilogram without epinephrine and seven milligrams per kilogram with epinephrine
• Shave biopsy is appropriate for raised lesions with tangential removal and aluminum chloride hemostasis
• Punch biopsy at three to four millimeters provides full-thickness dermis sampling with possible suture closure
• Cryotherapy with liquid nitrogen uses ten to thirty second freeze times and patients should expect blister formation
• Joint injections require sterile technique with aspiration before injection and a frequency limit of three to four per year per site
• Primary wound closure is appropriate for clean wounds within six to twelve hours, with thorough irrigation as the critical preparatory step
• Suture removal timing is site-specific: face at three to five days, trunk and scalp at seven to ten days, extremities at ten to fourteen days
• Abscess incision and drainage requires adequate incision length, exploration of loculations, and packing for deep cavities
• Complications including infection, hematoma, and dehiscence should be recognized promptly, with referral when findings exceed primary care scope

Key Terms

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