Irritable bowel syndrome and negative appendectomy: a prospective multivariable investigation

Ching-Liang Lu; Chun-Chu Liu; Jong-Ling Fuh; Pei-Yi Liu; Chew-Wun Wu; Full-Young Chang; Shou-Dong Lee
May 2007
Gut;May2007, Vol. 56 Issue 5, p655
Academic Journal
Objective: To examine prospectively whether irritable bowel syndrome (IBS) or other variables-that is, psychiatric profiles, health-related quality of life (HRQoL) and clinical features-are associated with negative appendectomy (NA). Design: Longitudinal study. Setting: Inpatient and emergency service in a university-affiliated teaching hospital. Patients: 430 consecutive patients underwent emergent surgery for suspected appendicitis. Main outcome measures: Rome-II IBS questionnaire; the Hospital Anxiety and Depression Scale; the Short-Form 36 survey; the clinical, pathological and CT findings. Results: The NA group (n = 68, 15.8%) was younger, with female predominance, higher prevalence of Rome-II IBS, higher anxiety/depression scores and lower levels of HRQoL than the positive appendectomy group. The patients with NA tended to have atypical presentations (absence of migration pain/fever/muscle guarding), lower white cell count and percentage of polymorphonuclear cells (PMNC) and lower rate of CT scan usage than the positive group. After multiple logistic regression, IBS (OR 2.17; 95% CI 1.14 to 4.24), degree of anxiety (OR 1.12; 95% CI 1.02 to 1.49), absence of migrating pain (OR 3.43; 95% CI 1.90 to 5.95)/muscle guarding (OR 3.72; 95% CI 2.07 to 6.70), a lower PMNC percentage (<75%; OR 3.05; 95% CI 1.69 to 5.51) and no CT scan usage (OR 2.32; 95% CI 1.27 to 4.26) were found to be the independent factors in predicting NA. Conclusion: Both patient (IBS, anxiety, atypical presentation) and physician (low CT scan usage) factors are the independent determinants predicting NA. Physicians should be cautious before operating on or referring patients with IBS for appendectomy. CT scan should be considered in patients with suspected appendicitis, particularly in those with IBS and atypical clinical presentations.


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