# Clinical Cases: Surgical Critical Care

## Case 1: Septic Shock from Intra-abdominal Source

### Patient Demographics
- **Age:** 65 years
- **Sex:** Female
- **Occupation:** Retired school teacher

### Chief Complaint
"She's confused and has a fever - we think something is wrong with her belly."

### History of Present Illness
The patient's daughter brought her to the emergency department with a 2-day history of progressive confusion, fever, and malaise. The patient has been complaining of abdominal pain for the past week, initially mild but worsening. She had a laparoscopic cholecystectomy 10 days ago for acute cholecystitis. She was discharged on POD 1 and initially doing well. Over the past 48 hours, she has become increasingly confused, febrile, and has had rigors. She is unable to provide a clear history.

### Past Medical History
- Recent laparoscopic cholecystectomy (10 days ago)
- Type 2 diabetes
- Hypertension
- Hypothyroidism

### Medications
- Metformin 1000 mg BID
- Lisinopril 10 mg daily
- Levothyroxine 75 mcg daily

### Physical Examination
- **Vitals:** BP 78/42 mmHg, HR 124 bpm, RR 26/min, Temp 39.2°C, SpO2 92% on room air
- **General:** Acutely ill-appearing, confused, diaphoretic
- **Cardiovascular:** Tachycardic, regular
- **Pulmonary:** Tachypneic, clear to auscultation
- **Abdomen:** Distended, diffuse tenderness, RUQ guarding, decreased bowel sounds
- **Skin:** Mottled extremities, delayed capillary refill (>4 seconds)
- **Mental status:** Confused, GCS 13 (E3V4M6)

### Initial Assessment
- **SIRS criteria met:** Temperature, heart rate, respiratory rate, WBC (pending)
- **Suspected sepsis with organ dysfunction (septic shock)**
- **Source:** Likely intra-abdominal (recent surgery, abdominal findings)

### Resuscitation (Hour-1 Bundle)
1. **Lactate:** Ordered immediately
2. **Blood cultures:** x2 sets drawn before antibiotics
3. **Broad-spectrum antibiotics:** Piperacillin-tazobactam IV (within 1 hour)
4. **Fluid resuscitation:** 30 mL/kg crystalloid bolus initiated
5. **Vasopressors:** If hypotension persists after fluid resuscitation

### Initial Laboratory Results
- WBC: 22,400/μL (left shift, 15% bands)
- Hemoglobin: 10.8 g/dL
- Platelets: 98,000/μL (decreasing - DIC concern)
- Creatinine: 2.4 mg/dL (baseline 0.9 - AKI)
- Lactate: 5.8 mmol/L (elevated)
- Total bilirubin: 3.2 mg/dL
- ALT: 128 U/L
- AST: 142 U/L
- Procalcitonin: 28 ng/mL (markedly elevated)
- ABG: pH 7.28, pCO2 28, HCO3 14, PaO2 68 on 4L NC (metabolic acidosis, hypoxia)

### SOFA Score Assessment
- Respiratory: PaO2/FiO2 <300 (+2)
- Coagulation: Platelets <100k (+2)
- Liver: Bilirubin 3.2 (+1)
- Cardiovascular: Requiring vasopressors (+3)
- CNS: Confused (+2)
- Renal: Creatinine 2.4 (+2)
- **Total SOFA: 12 (severe organ dysfunction)**

### Imaging

**CT Abdomen/Pelvis with IV contrast:**
- 6 cm rim-enhancing fluid collection in the gallbladder fossa
- Surrounding inflammation
- Small amount of free fluid
- Possible bile leak with secondary infection (biloma/abscess)
- Surgical clips in place

### Diagnosis
- **Septic shock** secondary to infected biloma/intra-abdominal abscess
- Likely complication of recent cholecystectomy (bile leak)

### Management

**Resuscitation continued:**
- After 30 mL/kg fluid bolus, MAP remained <65 mmHg
- Norepinephrine infusion started, titrated to MAP ≥65

**Source control:**
- IR-guided percutaneous drainage of abscess
- Drain placed: 150 mL of purulent, bilious fluid
- Culture sent

### ICU Management
- **Mechanical ventilation:** Intubated for respiratory failure and airway protection
- **Vasopressors:** Norepinephrine, added vasopressin when NE dose high
- **Renal:** Oliguric despite fluids, started CRRT for AKI and acidosis
- **Stress-dose steroids:** Hydrocortisone 50 mg q6h (vasopressor-refractory shock)
- **Glucose control:** Insulin infusion targeting 140-180 mg/dL
- **DVT prophylaxis:** SCDs initially, then LMWH when platelets stable

### Clinical Course
- **Day 1-2:** Remained critically ill, high vasopressor requirements
- **Day 3:** Drain output decreased, cultures: E. coli and Enterococcus
- **Day 4:** Vasopressors weaned
- **Day 5:** Extubated successfully
- **Day 7:** Off CRRT, renal function recovering
- **Day 10:** Drain removed, transferred to floor

### Discharge
- Day 14
- Oral antibiotics to complete course
- Follow-up with surgery and infectious disease

### Teaching Points
1. Sepsis-3 definition: Infection + organ dysfunction (SOFA ≥2)
2. Hour-1 bundle: Lactate, cultures, antibiotics, fluids, vasopressors if needed
3. Source control is essential - drainage, debridement, or surgery
4. MAP ≥65 mmHg target with vasopressors
5. Norepinephrine is first-line vasopressor
6. Consider steroids for vasopressor-refractory shock
7. Postoperative complications can present delayed and severe

### Clinical Image
![ARDS Chest X-ray](case_01_image.jpg)

**Image Description:** Chest X-ray of a patient with septic shock and acute respiratory distress syndrome (ARDS) demonstrating bilateral diffuse opacities consistent with pulmonary edema and acute lung injury. The endotracheal tube and central venous catheter are in appropriate position.

**Attribution:** Image from Wikimedia Commons, Category:X-rays of the chest. Source: https://commons.wikimedia.org/wiki/Category:X-rays_of_the_chest

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## Case 2: ARDS Following Aspiration Pneumonia

### Patient Demographics
- **Age:** 58 years
- **Sex:** Male
- **Occupation:** Construction manager

### Chief Complaint
"He aspirated during his surgery and now can't breathe on his own."

### History of Present Illness
The patient underwent elective right hemicolectomy for colon cancer yesterday. During emergence from anesthesia, he vomited and aspirated gastric contents. He was reintubated immediately. Over the past 24 hours, he has developed progressively worsening hypoxemia despite increasing oxygen support. His chest X-ray has shown bilateral infiltrates. He is now on high ventilator settings with poor oxygenation.

### Past Medical History
- Colon cancer (recent diagnosis)
- GERD (significant history, on PPI)
- Obesity (BMI 34)
- Obstructive sleep apnea
- Hypertension

### Current Ventilator Settings
- Mode: Volume control
- Tidal volume: 550 mL (6-7 mL/kg ideal body weight)
- Rate: 24
- FiO2: 80%
- PEEP: 12 cmH2O
- Plateau pressure: 32 cmH2O

### Arterial Blood Gas
- pH: 7.32
- PaCO2: 48 mmHg
- PaO2: 62 mmHg (on 80% FiO2)
- HCO3: 24 mEq/L
- P/F ratio: 77.5 (severe ARDS)

### Laboratory Results
- WBC: 18,600/μL
- Hemoglobin: 11.2 g/dL
- Platelets: 186,000/μL
- Creatinine: 1.2 mg/dL
- Lactate: 2.4 mmol/L

### Imaging

**Chest X-ray:**
- Bilateral diffuse alveolar infiltrates
- Consistent with ARDS
- No pneumothorax

**Chest CT (if performed):**
- Bilateral ground-glass opacities with dependent consolidation
- No pulmonary embolism
- Consistent with ARDS

### Berlin Definition Assessment
- **Timing:** Within 1 week of known insult (aspiration)
- **Chest imaging:** Bilateral opacities not fully explained by effusion/collapse
- **Origin of edema:** Not fully explained by cardiac failure (ECHO normal)
- **P/F ratio:** 77.5 with PEEP ≥5 = **Severe ARDS** (<100)

### Diagnosis
Severe ARDS secondary to aspiration pneumonia

### Management - Lung Protective Ventilation (ARDSnet)
1. **Low tidal volume:** Target 6 mL/kg ideal body weight (IBW)
   - IBW: 80 kg → Target TV: 480 mL
2. **Plateau pressure:** Target <30 cmH2O
3. **PEEP optimization:** Use PEEP/FiO2 table (high PEEP strategy given severe ARDS)
4. **Permissive hypercapnia:** Accept PaCO2 up to 60 if pH >7.25
5. **Conservative fluid strategy:** Target CVP 4-8, maintain UOP

### Adjunctive Therapies Considered

**Prone positioning:**
- Indicated for P/F <150 despite optimal ventilation
- Patient proned for 16 hours/day
- P/F ratio improved to 120 after proning

**Neuromuscular blockade:**
- Cisatracurium infusion for 48 hours
- Reduces ventilator dyssynchrony
- May improve outcomes in severe ARDS

**Inhaled pulmonary vasodilators:**
- Inhaled epoprostenol considered for refractory hypoxemia
- Not required as patient responded to proning

### Clinical Course
- **Day 1-3:** Severe hypoxemia, continued prone positioning
- **Day 4:** P/F ratio improving (150), weaning FiO2
- **Day 5:** Supine, tolerating well
- **Day 7:** P/F ratio 220, passing spontaneous breathing trial
- **Day 8:** Extubated successfully
- **Day 10:** Transferred to floor on nasal cannula

### Prevention of Future Aspiration
- Elevate head of bed 30-45 degrees
- Prokinetic agents for gastroparesis
- Consider post-pyloric feeding
- Optimize GERD management

### Teaching Points
1. ARDS = acute hypoxemic respiratory failure with bilateral infiltrates (Berlin Definition)
2. P/F ratio determines severity (mild >200, moderate 100-200, severe <100)
3. Low tidal volume ventilation (6 mL/kg IBW) is foundational
4. Plateau pressure <30 cmH2O prevents ventilator-induced lung injury
5. Prone positioning improves V/Q matching and survival in severe ARDS
6. Conservative fluid management improves outcomes
7. Aspiration is preventable - assess risk factors and implement precautions

### Clinical Image
![ARDS Chest X-ray](case_02_image.jpg)

**Image Description:** Chest X-ray demonstrating bilateral diffuse alveolar infiltrates characteristic of acute respiratory distress syndrome (ARDS). The bilateral opacities are not fully explained by cardiac failure, effusion, or atelectasis.

**Attribution:** Image from Wikimedia Commons, Category:X-rays of the chest. Source: https://commons.wikimedia.org/wiki/Category:X-rays_of_the_chest

---

## Case 3: Postoperative Hemorrhagic Shock

### Patient Demographics
- **Age:** 62 years
- **Sex:** Female
- **Occupation:** Office manager

### Chief Complaint
Nurse call: "Her blood pressure is dropping and the drain output is increasing."

### History of Present Illness
The patient underwent total abdominal hysterectomy with bilateral salpingo-oophorectomy for uterine cancer 6 hours ago. The procedure was uncomplicated with estimated blood loss of 400 mL. She was extubated in the OR and transferred to the PACU in stable condition. Over the past 2 hours, the nurse has noted progressive tachycardia and now hypotension. The Jackson-Pratt drain output has been 350 mL of bloody drainage in the past 4 hours (increasing).

### Timeline of Events
- OR end: BP 118/72, HR 78
- PACU +2 hours: BP 110/68, HR 88
- PACU +4 hours: BP 98/62, HR 104, drain 200 mL
- PACU +6 hours: BP 82/54, HR 122, drain 350 mL total → called for evaluation

### Physical Examination
- **Vitals:** BP 82/54, HR 122, RR 24, SpO2 96% on 2L NC
- **General:** Pale, anxious, restless
- **Cardiovascular:** Tachycardic, weak pulses
- **Abdomen:** Soft, mild distension, diffuse tenderness, incision intact with small ecchymosis
- **Drain output:** Bloody, actively draining
- **Urine output:** 15 mL in past 2 hours (oliguric)

### Hemorrhagic Shock Classification

**Class III Hemorrhagic Shock (30-40% blood loss):**
- Heart rate: 120-140
- Blood pressure: Decreased
- Pulse pressure: Decreased
- Urine output: 5-15 mL/hr
- Mental status: Anxious, confused
- Estimated blood loss: 1500-2000 mL

### Initial Laboratory Results
- Hemoglobin: 7.2 g/dL (preop 12.8)
- Hematocrit: 21%
- Platelets: 152,000/μL
- INR: 1.2
- Fibrinogen: 180 mg/dL
- Lactate: 4.2 mmol/L
- ABG: pH 7.31, metabolic acidosis

### Resuscitation
1. **IV access:** Confirm large-bore access, add second line
2. **Fluid resuscitation:** Crystalloid bolus initiated
3. **Blood products:** Type and screen confirmed, uncrossmatched O-negative blood requested, then type-specific when available
4. **Massive transfusion protocol:** Activated given ongoing hemorrhage

### Decision Point
**Operative vs. Non-operative management:**
- Hemodynamically unstable
- Ongoing hemorrhage (high drain output + dropping Hgb)
- Source likely surgical bleeding

**Decision:** Return to OR for emergent exploration

### Operative Re-Exploration
**Findings:**
- 1.5 L hemoperitoneum
- Active arterial bleeding from uterine artery pedicle
- Suture had partially loosened
- Clot evacuated, bleeder identified and suture-ligated
- Abdomen irrigated, inspected for other bleeding sources
- Drain replaced, abdomen closed

### Intraoperative Blood Products
- 4 units PRBCs
- 2 units FFP
- 1 unit platelets

### Postoperative ICU Management
- Continued resuscitation to endpoints:
  - Lactate normalization
  - Urine output >0.5 mL/kg/hr
  - MAP >65
- Serial hemoglobin monitoring
- Coagulation parameters monitored

### Clinical Course
- **Post-reexploration:** Hemodynamically stable
- **4 hours post-OR:** Lactate 1.8, improving
- **POD 1:** Hemoglobin stable at 9.2
- **POD 2:** Transferred to floor
- **POD 5:** Discharged home

### Root Cause Analysis
- Likely inadequate hemostasis of uterine artery pedicle during initial surgery
- Contributing factors: Patient on aspirin preoperatively (held, but residual effect)
- Prevention: Meticulous hemostasis, inspection before closure, consider leaving drains in high-risk cases

### Teaching Points
1. Tachycardia is often the earliest sign of hemorrhagic shock
2. Young patients can maintain blood pressure despite significant blood loss
3. Don't wait for obvious hypotension - trending vital signs is key
4. Drain output can be a useful indicator of ongoing hemorrhage
5. If source is surgical, return to OR for definitive control
6. Massive transfusion: 1:1:1 ratio (RBC:FFP:Platelets)
7. Resuscitation targets: Lactate, urine output, mental status, blood pressure

### Clinical Image
![Hemorrhagic Shock Resuscitation](case_03_image.jpg)

**Image Description:** Clinical monitoring during resuscitation of hemorrhagic shock demonstrating key parameters including continuous blood pressure monitoring, fluid and blood product administration, and trending of vital signs to assess response to therapy.

**Attribution:** Image from Wikimedia Commons, Category:Medical ultrasound. Source: https://commons.wikimedia.org/wiki/Category:Medical_ultrasound