## Analysis of Pathophysiology and Clinical Signs in Acute Appendicitis ### Correct Answer: "Positive Rovsing's sign indicates peritoneal irritation and suggests perforation has already occurred" **Key Point:** Rovsing's sign is a clinical indicator of peritoneal irritation but does NOT necessarily indicate perforation. It can be positive in uncomplicated acute appendicitis with localized peritonitis. **Clinical Pearl:** Rovsing's sign (pain in the RLQ when the LLQ is palpated) reflects visceral peritoneal irritation from the inflamed appendix, not necessarily transmural inflammation or perforation. Many patients with uncomplicated appendicitis (no perforation) have a positive Rovsing's sign. ### Why the Other Options Are Correct | Feature | Truth | Explanation | |---------|-------|-------------| | Fecoliths as initiating factor | TRUE | Fecoliths obstruct the appendiceal lumen in ~40% of cases; lymphoid hyperplasia (viral), strictures, and Crohn's disease are other causes. Obstruction → increased intraluminal pressure → mucosal ischemia → bacterial invasion. | | Visceral pain pathway | TRUE | Appendiceal visceral afferents travel with sympathetic fibers via the superior mesenteric plexus to T10 spinal segments, causing referred pain at the umbilicus in early appendicitis. Somatic pain (from parietal peritoneum) is later and localizes to RLQ. | | Inflammatory markers | TRUE | CRP and procalcitonin are elevated in appendicitis and correlate with severity and risk of perforation. CRP typically rises within 6–8 hours; procalcitonin is more specific for bacterial infection. | **High-Yield:** The progression of pain (umbilical → RLQ) is a classic teaching point and reflects the transition from visceral to somatic innervation. **Warning:** Do not confuse "positive Rovsing's sign" with "perforation." Perforation is a complication, not a prerequisite for the sign. [cite:Sabiston Textbook of Surgery 21e Ch 51]
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