# Medical Emergencies in the Oral Surgery Office

## Introduction

Medical emergencies, though infrequent, can occur in any oral surgery practice. The OMFS surgeon must be prepared to recognize, manage, and stabilize patients experiencing acute events. A well-trained team, regularly rehearsed emergency protocols, and proper equipment are the foundations of emergency preparedness.

## Epidemiology

Syncope accounts for approximately 50% of all office emergencies. Allergic reactions, hyperventilation, and hypoglycemia constitute the next most common events. Life-threatening emergencies such as anaphylaxis, cardiac arrest, and airway obstruction are rare but carry high mortality if not managed promptly. Incidence increases with sedation and general anesthesia, medically complex patients, and longer procedures.

## Emergency Preparedness

### Personnel and Training

All clinical staff must maintain current Basic Life Support (BLS) certification. OMFS surgeons administering sedation or anesthesia must hold Advanced Cardiovascular Life Support (ACLS) certification, and if treating pediatric patients, Pediatric Advanced Life Support (PALS) as well. Emergency drills should be conducted at least quarterly with documentation.

### Equipment and Medications

The emergency drug kit must be checked and restocked regularly, and medications must not be expired. An automated external defibrillator (AED) or manual defibrillator is required. A positive-pressure oxygen delivery system with a full E-cylinder backup, suction, airway adjuncts (OPA, NPA, LMA), bag-valve-mask, IV access supplies, pulse oximeter, capnograph, and blood pressure monitor must all be available.

## Specific Medical Emergencies

| Emergency | Key Presentation | First-Line Treatment | Critical Drug/Dose |
|---|---|---|---|
| Syncope | Pallor, bradycardia, LOC | Supine, legs elevated | Atropine 0.5 mg IV (if persistent bradycardia) |
| Anaphylaxis | Urticaria, angioedema, hypotension | Epinephrine IM | Epinephrine 0.3-0.5 mg IM (1:1000) |
| Airway obstruction (foreign body) | Choking, stridor, cyanosis | Heimlich / Magill forceps | Succinylcholine 0.1-0.5 mg/kg IV (laryngospasm) |
| Acute coronary syndrome | Chest pain, diaphoresis | Aspirin + nitroglycerin + EMS | Aspirin 325 mg PO; NTG 0.4 mg SL |
| Cardiac arrest | Unresponsive, no pulse | CPR + defibrillation | Epinephrine 1 mg IV q3-5 min |
| Hypoglycemia | Tremor, confusion, diaphoresis | Oral glucose (conscious) | D50W 25-50 mL IV (unconscious) |
| Seizure | Tonic-clonic activity | Protect patient, suction | Midazolam 5 mg IM/IV |
| Hypertensive crisis | SBP >180, end-organ symptoms | Stop procedure, reassure | Labetalol 20 mg IV |
| Adrenal crisis | Hypotension refractory to fluids | Hydrocortisone IV + fluids | Hydrocortisone 100 mg IV bolus |
| LAST | Perioral numbness, seizures, arrhythmia | Stop injection, lipid emulsion | 20% Intralipid 1.5 mL/kg IV bolus |

### Syncope (Vasovagal Episode)

Syncope is the most common office emergency. It is triggered by anxiety, pain, and orthostatic changes and presents with pallor, diaphoresis, bradycardia, and loss of consciousness. Management consists of placing the patient in a supine position with legs elevated, applying a cold compress, and using an ammonia inhalant. Atropine 0.5 mg IV is given for persistent bradycardia. Cardiac syncope must be distinguished from vasovagal syncope by history and recovery pattern.

### Anaphylaxis

Anaphylaxis is a severe, potentially fatal IgE-mediated hypersensitivity reaction. Common triggers in OMFS include latex, antibiotics (penicillin), local anesthetics (rarely), and NSAIDs. Signs include urticaria, angioedema, bronchospasm, hypotension, and tachycardia. Management centers on epinephrine 0.3 to 0.5 mg IM (anterolateral thigh), repeated every 5 to 15 minutes as needed, along with IV fluids, diphenhydramine 50 mg IV, methylprednisolone 125 mg IV, and albuterol nebulizer for bronchospasm. Epinephrine is the only first-line treatment, and its administration should not be delayed.

### Airway Obstruction

Causes include foreign body aspiration (tooth, crown, implant component), laryngospasm, and angioedema. For foreign body obstruction, abdominal thrusts (Heimlich maneuver) are performed if the patient is conscious, and direct laryngoscopy with Magill forceps extraction is performed if the patient is unconscious. Laryngospasm is treated with positive pressure ventilation, jaw thrust, and succinylcholine 0.1 to 0.5 mg/kg IV if refractory. All aspirated objects require a chest radiograph to rule out bronchial aspiration.

![Illustration of emergency drug kit contents and organization for an OMFS office](images/emergency-drug-kit.jpg)

### Acute Coronary Syndrome

Acute coronary syndrome presents with chest pain, dyspnea, diaphoresis, and radiating arm or jaw pain. Management includes stopping the procedure, administering aspirin 325 mg chewed, nitroglycerin 0.4 mg sublingual (up to 3 doses), supplemental oxygen if SpO2 is less than 94%, and activating EMS. Morphine 2 to 4 mg IV is given for pain unresponsive to nitroglycerin. Nitroglycerin should not be administered if systolic blood pressure is less than 90 mmHg or if a phosphodiesterase inhibitor has been used within 24 to 48 hours.

### Cardiac Arrest

Cardiac arrest is managed following current AHA ACLS algorithms. High-quality CPR is performed at a rate of 100 to 120 per minute, a depth of 5 to 6 cm, with full recoil and minimal interruptions. Shockable rhythms (VF/pVT) receive defibrillation as soon as possible. Non-shockable rhythms (asystole/PEA) receive CPR and epinephrine 1 mg IV every 3 to 5 minutes. Reversible causes are identified and treated using the H's and T's framework.

### Hypoglycemia

Hypoglycemia is defined as blood glucose less than 70 mg/dL and presents with diaphoresis, tremor, confusion, tachycardia, and seizures. A conscious patient receives oral glucose 15 to 20 g, while an unconscious patient receives dextrose 50% at 25 to 50 mL IV or glucagon 1 mg IM. Diabetic patients on insulin or sulfonylureas are at highest risk, and fasting instructions should be confirmed preoperatively.

### Seizures

The patient is protected from injury without restraint or placing objects in the mouth. Airway patency is ensured and secretions suctioned. Midazolam 5 mg IM or IV is the first-line treatment for prolonged seizures lasting greater than 5 minutes. EMS is activated if the seizure does not resolve or the patient does not regain consciousness.

![Flowchart for managing anaphylaxis in the dental office with stepwise treatment protocol](images/anaphylaxis-management-flowchart.jpg)

### Hypertensive Crisis

Hypertensive crisis is defined as systolic blood pressure greater than 180 mmHg and/or diastolic greater than 120 mmHg with end-organ symptoms. The procedure is stopped, the patient reassured, and labetalol 20 mg IV or esmolol infusion administered. EMS is activated for hypertensive emergency.

### Adrenal Crisis

Adrenal crisis occurs in patients on chronic corticosteroids with a suppressed HPA axis. It presents with hypotension refractory to fluids, weakness, nausea, and altered mental status. Management consists of hydrocortisone 100 mg IV bolus, aggressive fluid resuscitation, and vasopressors if needed.

## Local Anesthetic Toxicity (LAST)

Local anesthetic systemic toxicity is dose-dependent and affects the CNS and cardiovascular system. Early signs include perioral numbness, tinnitus, metallic taste, and agitation. Severe signs include seizures, arrhythmias, and cardiovascular collapse. Management involves stopping the injection, managing the airway, administering benzodiazepines for seizures, and giving 20% lipid emulsion (Intralipid) as a 1.5 mL/kg IV bolus followed by infusion. Prevention strategies include aspirating before injection, using the lowest effective dose, and adhering to maximum recommended doses.

![Diagram showing maximum recommended local anesthetic doses and early signs of toxicity](images/local-anesthetic-toxicity.jpg)

## Clinical Pearls

Syncope is the most common emergency, but the surgeon must always consider more serious etiologies. Epinephrine is the cornerstone of anaphylaxis treatment, and antihistamines and steroids are adjuncts, not substitutes. The emergency drug kit must be maintained and regularly checked, as expired medications are a liability risk. Every team member should know their role in an emergency, and drills should be conducted with debriefing after real events. Twenty percent lipid emulsion must be stocked in every office where local anesthetics are administered in significant volumes.

## References

1. Malamed SF. *Medical Emergencies in the Dental Office*. 8th ed. Elsevier; 2022.
2. American Heart Association. *ACLS Provider Manual*. 2020 Guidelines Update.
3. Haas DA. "Management of Medical Emergencies in the Dental Office." *Anesthesia Progress*. 2021;68(3):153-164.
4. Neal JM, et al. "American Society of Regional Anesthesia and Pain Medicine Checklist for Managing Local Anesthetic Systemic Toxicity." *Regional Anesthesia and Pain Medicine*. 2018;43(2):150-153.