# Clinical Cases: Post-Operative Care and Management

## Case 1: Managing Postoperative Ileus and Pain

### Patient Presentation
**Demographics:** 52-year-old female

**Chief Complaint:** POD 3 following open sigmoid colectomy for diverticular disease

**History of Present Illness:**
Ms. Rodriguez underwent an elective sigmoid colectomy with primary anastomosis for recurrent diverticulitis. She has been progressing slowly postoperatively with persistent nausea and abdominal distension. No flatus or bowel movement since surgery.

**Post-Operative Course:**
- POD 0-1: Stable, started on clear liquids per ERAS protocol
- POD 2: Nausea with attempted diet advancement, returned to NPO
- POD 3: Continued distension, complaining of diffuse crampy abdominal discomfort

**Current Medications:**
- Hydromorphone PCA 0.2mg q8min (using 15mg/day total)
- Ondansetron 4mg IV q8h PRN
- Enoxaparin 40mg SQ daily
- IV LR at 100 mL/hr

**Physical Examination:**
- Vitals: T 37.6C, HR 94, BP 118/72, RR 16
- Abdomen: Moderately distended, tympanic to percussion, diffusely tender without peritoneal signs, hypoactive bowel sounds, wound intact with staples
- JP drain: 25mL serosanguinous over 24h

**Laboratory Studies:**
- WBC: 11,200 (down from 13,000 POD 1)
- K: 3.2 mEq/L
- Mg: 1.6 mg/dL

**Imaging:**
- KUB: Dilated loops of small bowel with air-fluid levels, no free air, gas present in colon

### Clinical Questions

1. **Is this ileus or mechanical small bowel obstruction? How do you differentiate?**

   | Feature | Ileus | Mechanical SBO |
   |---------|-------|----------------|
   | Timing | Early postop (expected POD 1-5) | Later (often >POD 5-7) |
   | Bowel sounds | Absent or hypoactive | High-pitched, hyperactive |
   | Pain character | Diffuse, mild | Colicky, cramping |
   | Distension | Diffuse | May be localized |
   | Imaging | Diffuse dilation, no transition | Clear transition point |
   | Flatus | Absent | May have initially, then stops |

   **Assessment:** This is postoperative ileus
   - Timing appropriate (POD 3)
   - Diffuse dilation without transition point
   - Hypoactive bowel sounds
   - No peritoneal signs concerning for leak or obstruction

2. **What factors are contributing to her ileus, and what interventions can help?**

   **Contributing Factors & Interventions:**

   | Factor | Intervention |
   |--------|--------------|
   | High opioid use (15mg hydromorphone/day) | Transition to multimodal: scheduled acetaminophen, ketorolac if safe, gabapentin; reduce PCA demand dose |
   | Hypokalemia (K 3.2) | Replete K to >4.0 mEq/L |
   | Low magnesium (1.6) | Replete Mg to >2.0 mg/dL |
   | Limited mobility | Increase ambulation to QID with assistance |
   | Continued NPO | Continue NPO but consider NGT if worsening |

   **Additional Measures:**
   - Gum chewing (sham feeding stimulates motility)
   - Ensure SCDs on, not causing discomfort limiting mobility
   - Consider alvimopan (Entereg) if available and indicated

3. **Her pain is not well-controlled despite PCA. How do you optimize multimodal analgesia?**

   **Multimodal Pain Management Protocol:**

   | Agent | Dose | Mechanism | Notes |
   |-------|------|-----------|-------|
   | Acetaminophen | 1g IV/PO q6h scheduled | Central/peripheral | First-line, no GI effects |
   | Ketorolac | 15-30mg IV q6h x 48h | NSAID | Check renal function, avoid if Cr elevated |
   | Gabapentin | 100-300mg TID | Neuropathic | Reduces opioid requirements |
   | Lidocaine patch | 5% over incision | Local anesthetic | Non-systemic option |

   **Reduce PCA:**
   - Decrease demand dose to 0.15mg
   - Add 4-hour lockout maximum
   - Goal: 50% reduction in opioid use

4. **On POD 4, she develops tachycardia (HR 112) with a temperature of 38.6C. What is your differential and workup?**

   **Differential Diagnosis (5 W's + anastomotic leak):**
   1. **Anastomotic leak** (HIGH PRIORITY) - Tachycardia often first sign
   2. Wind - Pneumonia/atelectasis
   3. Water - UTI
   4. Wound - SSI (early for POD 4)
   5. Walking - DVT/PE
   6. Wonder drugs - Drug fever

   **Workup:**
   - CBC, BMP, lactate, procalcitonin
   - Blood cultures x 2
   - Urinalysis and culture
   - Chest X-ray
   - CT abdomen/pelvis with IV and oral contrast (rule out leak)
   - Consider lower extremity duplex if PE suspected

   **If CT shows anastomotic leak:**
   - NPO, IV fluids, broad-spectrum antibiotics
   - Surgical consultation for washout vs. IR drainage
   - Notify attending immediately

### Clinical Image

![Abdominal X-ray showing ileus](https://upload.wikimedia.org/wikipedia/commons/4/47/Ileus_X-ray.jpg)

*Image: Plain abdominal radiograph demonstrating dilated loops of small bowel consistent with ileus. Note the diffuse distribution of gas without a clear transition point. Source: Wikimedia Commons. License: CC BY-SA 3.0.*

**Image Attribution:** Ileus X-ray. Wikimedia Commons. CC BY-SA 3.0.

---

## Case 2: Post-Operative Respiratory Complications

### Patient Presentation
**Demographics:** 67-year-old male

**Chief Complaint:** Increasing oxygen requirement on POD 2 following open abdominal aortic aneurysm repair

**History of Present Illness:**
Mr. Davis underwent elective open AAA repair for a 6.2cm infrarenal aneurysm. The procedure took 4.5 hours with an estimated blood loss of 800mL. He was extubated in the OR and transferred to the surgical ICU. He has been requiring increasing supplemental oxygen.

**Past Medical History:**
- AAA (now s/p repair)
- COPD (FEV1 58% predicted, on tiotropium)
- Former smoker (quit 2 months ago, 45 pack-years)
- Hypertension
- Obesity (BMI 32)

**Post-Operative Course:**
- POD 0: Extubated, stable on 4L NC
- POD 1: Required 6L NC to maintain SpO2 >92%
- POD 2: Now on 10L high-flow NC, SpO2 90-92%, mildly dyspneic

**Physical Examination:**
- Vitals: T 38.0C, HR 102, BP 145/88, RR 24, SpO2 91% on 10L NC
- General: Alert, speaking in short sentences
- Lungs: Diminished breath sounds at bases bilaterally, scattered rhonchi
- Cardiovascular: Tachycardic, regular, no murmur
- Abdomen: Midline incision intact, soft, mildly distended
- Extremities: 1+ bilateral lower extremity edema, SCDs in place

**Laboratory Studies:**
- WBC: 14,500
- Hgb: 9.8 g/dL (from 11.2 pre-op)
- ABG on 10L NC: pH 7.38, pCO2 42, pO2 62, HCO3 24
- BNP: 450 pg/mL (mildly elevated)

**Imaging:**
- CXR: Bilateral lower lobe opacities, small bilateral pleural effusions, mild pulmonary vascular congestion

### Clinical Questions

1. **What is the differential diagnosis for his hypoxemia?**

   **Differential Diagnosis:**
   | Diagnosis | Supporting Features | Against |
   |-----------|--------------------|---------|
   | Atelectasis | Post-op, poor inspiration, basilar findings | Should improve with IS |
   | Pulmonary edema/fluid overload | Received blood products, elevated BNP, congestion on CXR | BNP only mildly elevated |
   | Pneumonia | Fever, leukocytosis, productive cough | Early for hospital-acquired PNA |
   | Pulmonary embolism | Post-op, tachycardia, hypoxemia | On prophylaxis, no pleuritic pain |
   | ARDS | High-risk surgery, bilateral infiltrates | P/F ratio ~62/0.5 = 124 (moderate ARDS criteria) |

2. **Calculate his P/F ratio. Does he meet ARDS criteria?**

   **P/F Ratio Calculation:**
   - PaO2 = 62 mmHg
   - FiO2 on 10L NC ~ 0.44-0.50 (estimate 0.50)
   - P/F ratio = 62/0.50 = 124

   **Berlin Criteria for ARDS:**
   - Timing: Within 1 week of insult - YES
   - Imaging: Bilateral opacities - YES
   - Origin: Not fully explained by cardiac failure - UNCLEAR (needs echo)
   - Severity: P/F 100-200 = Moderate ARDS

   **Assessment:** Meets criteria for moderate ARDS, but cardiogenic component must be excluded with echocardiogram

3. **What interventions should be implemented?**

   **Respiratory Support:**
   - Transition to high-flow nasal cannula (40-60 L/min, FiO2 titrated)
   - Aggressive pulmonary toilet: IS q1h, chest PT, early mobilization
   - Consider BiPAP if not improving on HFNC
   - Prepare for intubation if continued deterioration

   **Fluid Management:**
   - Assess volume status carefully (elevated BNP, edema, but major surgery)
   - Consider diuresis if truly fluid overloaded
   - Maintain euvolemia - avoid additional boluses

   **Other Interventions:**
   - Continue DVT prophylaxis
   - CT-PE if suspicion remains high
   - Echocardiogram to assess cardiac function
   - Sputum culture if productive cough
   - Bronchodilators for COPD component

4. **What are the principles of lung-protective ventilation if intubation becomes necessary?**

   **Lung-Protective Ventilation Settings:**
   | Parameter | Target | Rationale |
   |-----------|--------|-----------|
   | Tidal Volume | 6-8 mL/kg IBW | Prevents volutrauma |
   | Plateau Pressure | <30 cm H2O | Prevents barotrauma |
   | PEEP | 8-15 cm H2O | Maintains alveolar recruitment |
   | FiO2 | Lowest to achieve SpO2 >92% | Prevents oxygen toxicity |
   | pH | Accept >7.20 | Permissive hypercapnia |

   **Ideal Body Weight Calculation:**
   - Male: 50 + 2.3 (height in inches - 60)
   - If 5'10" = 70 inches: 50 + 2.3(10) = 73 kg IBW
   - Target TV: 6 mL/kg = 438 mL (round to 450 mL)

### Clinical Image

![Sequential compression devices on patient legs](https://upload.wikimedia.org/wikipedia/commons/thumb/4/4d/Human_leg_in_SCDS_cropped.jpg/800px-Human_leg_in_SCDS_cropped.jpg)

*Image: Sequential compression devices (SCDs) for DVT prophylaxis. These should be applied to all post-surgical patients and continued throughout hospitalization. Source: Wikimedia Commons. License: CC BY-SA 3.0.*

**Image Attribution:** Sequential compression device. Wikimedia Commons. CC BY-SA 3.0.

---

## Case 3: Discharge Planning and Post-Discharge Complications

### Patient Presentation
**Demographics:** 45-year-old female

**Chief Complaint:** POD 4 following laparoscopic cholecystectomy, ready for discharge

**History of Present Illness:**
Ms. Kim underwent uncomplicated laparoscopic cholecystectomy for symptomatic cholelithiasis. Her postoperative course was complicated by nausea requiring an extra day of IV hydration, but she is now tolerating regular diet, pain is controlled with oral medications, and she is ambulatory.

**Discharge Day Assessment:**
- Vitals: T 37.1C, HR 76, BP 122/74
- Abdomen: Port sites healing well, covered with steri-strips, no erythema or drainage
- Tolerating regular diet without nausea
- Pain 3/10, well-controlled on acetaminophen and ibuprofen
- Ambulating independently
- Voiding without difficulty

**Discharge Medications:**
- Acetaminophen 650mg PO q6h PRN pain
- Ibuprofen 400mg PO q8h PRN pain (with food)
- Oxycodone 5mg PO q6h PRN breakthrough pain (#15 tablets)

### Clinical Questions

1. **What discharge criteria have been met?**

   **Discharge Criteria Checklist:**
   | Criterion | Status |
   |-----------|--------|
   | Afebrile x 24h | Yes (T 37.1) |
   | Vital signs stable | Yes |
   | Pain controlled on oral meds | Yes (3/10) |
   | Tolerating oral diet | Yes |
   | Ambulatory | Yes |
   | Voiding spontaneously | Yes |
   | Wound without concerning findings | Yes |
   | Social support adequate | Verify |
   | Prescriptions provided | Yes |
   | Follow-up arranged | Arrange |

2. **What discharge instructions should be provided?**

   **Activity Instructions:**
   - No heavy lifting (>10 lbs) for 2 weeks
   - May shower after 48 hours; no baths or swimming for 1 week
   - May drive once off opioid medications and can brake safely
   - Return to work in 1-2 weeks depending on job demands
   - Gradual return to normal activity as tolerated

   **Diet Instructions:**
   - Regular diet as tolerated
   - Some patients have loose stools initially - expected
   - Avoid fatty foods for 1-2 weeks if GI upset occurs

   **Wound Care:**
   - Keep steri-strips in place until they fall off (7-10 days)
   - Port sites may have small amounts of serous drainage initially
   - No need for dressing changes unless drainage soaks through

   **Warning Signs - Return to ED or Call if:**
   - Fever >38.3C (101F)
   - Worsening abdominal pain not controlled by medications
   - Redness, swelling, or purulent drainage from incisions
   - Persistent nausea/vomiting
   - Jaundice (yellowing of skin or eyes)

3. **Three days after discharge, Ms. Kim calls reporting fever to 38.5C, RUQ pain, and mild jaundice. What is your concern and next steps?**

   **Differential Diagnosis:**
   - **Retained CBD stone** (choledocholithiasis) - most likely given RUQ pain, jaundice
   - Bile leak
   - Biliary injury
   - Surgical site infection
   - Cholangitis

   **Recommended Actions:**
   - Direct patient to ED for evaluation
   - Order: CBC, CMP (with LFTs and bilirubin), lipase
   - RUQ ultrasound to evaluate bile ducts
   - If dilated CBD or concern for choledocholithiasis: MRCP or ERCP
   - If cholangitis (Charcot's triad: fever, RUQ pain, jaundice): admit, IV antibiotics, urgent ERCP

   **Surgical Team Notification:**
   - Contact attending surgeon to inform of complication
   - Arrange for urgent evaluation

4. **Imaging shows a dilated CBD to 12mm with a 6mm distal stone. What is the management?**

   **Management of Retained CBD Stone:**
   - Admit to hospital
   - IV fluids, NPO
   - IV antibiotics if signs of cholangitis (fever, elevated WBC)
   - ERCP with sphincterotomy and stone extraction
   - This is not a surgical complication but rather a missed stone
   - Consider intraoperative cholangiogram discussion for future cases

### Clinical Image

![Post-operative wound care](https://upload.wikimedia.org/wikipedia/commons/thumb/8/85/Wound_healing_phases.png/800px-Wound_healing_phases.png)

*Image: Phases of wound healing. Understanding these phases helps recognize normal versus abnormal healing. Source: Wikimedia Commons. License: CC BY-SA 4.0.*

**Image Attribution:** Wound healing phases diagram. Wikimedia Commons. CC BY-SA 4.0.

---

## Summary Points

1. **Ileus vs. SBO:** Ileus is diffuse with hypoactive bowel sounds; SBO has transition point with hyperactive sounds
2. **Ileus management:** Correct electrolytes (K>4, Mg>2), reduce opioids, ambulate, gum chewing
3. **Multimodal analgesia:** Scheduled acetaminophen, NSAIDs (if safe), gabapentin reduce opioid requirements by 30-50%
4. **Postoperative fever workup:** Consider anastomotic leak when tachycardia + fever after bowel surgery
5. **ARDS recognition:** P/F ratio <300 with bilateral infiltrates; lung-protective ventilation with low TV (6 mL/kg IBW)
6. **Discharge criteria:** Afebrile, tolerating PO, pain controlled on oral meds, ambulatory, wound stable, support available
7. **Discharge instructions:** Activity restrictions, wound care, diet, and clear warning signs for when to return
8. **Post-discharge complications:** Low threshold for evaluation; retained CBD stone presents with RUQ pain, jaundice, fever