## Acute Cholecystitis: Pathophysiology and Evidence-Based Management ### Pathophysiology of Acute Calculous Cholecystitis **Key Point:** Cystic duct obstruction by a gallstone is the primary mechanism in 90% of acute calculous cholecystitis. This leads to: 1. Bile stasis within the gallbladder 2. Increased intraluminal pressure 3. Release of phospholipase A2 from the gallbladder mucosa 4. Chemical inflammation (even without bacterial infection initially) 5. Secondary bacterial infection (E. coli, Klebsiella, Clostridium in 50–80% of cases) ### Acalculous Cholecystitis | Feature | Details | | --- | --- | | Incidence | 5–10% of acute cholecystitis | | Risk factors | Prolonged fasting, critical illness, sepsis, major surgery, trauma, TPN, vasculitis | | Mechanism | Bile stasis, ischemia, increased viscosity, secondary infection | | Prognosis | Worse than calculous cholecystitis (higher morbidity/mortality) | **High-Yield:** Acalculous cholecystitis is more common in ICU patients and carries higher morbidity. ### Timing of Cholecystectomy in Acute Cholecystitis **Clinical Pearl:** Early laparoscopic cholecystectomy (within 72 hours of symptom onset) is the **RECOMMENDED** approach and is NOT contraindicated. #### Evidence for Early Cholecystectomy 1. **Lower morbidity:** Early surgery (within 72 hours) has lower rates of conversion to open surgery, bile duct injury, and mortality compared to delayed surgery. 2. **Reduced hospital stay:** Early cholecystectomy shortens total hospital stay. 3. **Prevents complications:** Avoids progression to gangrenous cholecystitis, perforation, and sepsis. 4. **Cost-effective:** Reduces overall healthcare costs. 5. **Guideline recommendation:** Both American College of Surgeons and European guidelines recommend early laparoscopic cholecystectomy as the gold standard. ```mermaid flowchart TD A[Acute Cholecystitis Diagnosed]:::outcome --> B{Time since onset?}:::decision B -->|< 72 hours| C[Early Laparoscopic Cholecystectomy]:::action B -->|> 72 hours, stable| D[Medical management + delayed surgery]:::action C --> E[Lower morbidity, shorter stay]:::outcome D --> F[Inflammation resolves, then elective cholecystectomy]:::outcome B -->|Unfit for surgery| G[Percutaneous cholecystostomy]:::action G --> H[Definitive cholecystectomy when fit]:::action ``` **Mnemonic: EARLY** (reasons for early cholecystectomy in acute cholecystitis) - **E** — Evidence-based; guideline-recommended - **A** — Avoids complications (gangrene, perforation) - **R** — Reduces conversion rate to open surgery - **L** — Lower morbidity and mortality - **Y** — Yields shorter hospital stay ### Why Option 2 Is Incorrect The statement "Early laparoscopic cholecystectomy is contraindicated" is **FALSE**. Early cholecystectomy (within 72 hours) is the **standard of care** and is associated with better outcomes. This is the correct answer to the EXCEPT question. **Warning:** Delayed cholecystectomy (after 6–8 weeks) was historically recommended but is now outdated. Modern evidence strongly favors early intervention. [cite:Sabiston Textbook of Surgery Ch 51]
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