Diagnostic value of biochemical markers in prediction of perforation in acute appendicitis: a cross-sectional study.

Background: Acute appendicitis, despite being the most common surgery, can result in increased morbidity and mortality in the case of perforated appendicitis. Identifying a perforation early can reduce the impact on the patient. Bilirubin, C-reactive protein (CRP), and white blood cell (WBC) count have been shown to indicate perforation in appendicitis.

Methods: A cross-sectional analytical study was conducted to observe the association between preoperative bilirubin, CRP, and white cell count with the histological findings of either the presence or absence of perforation of the appendix. The eligibility criteria included all patients above 18 years with appendicitis who were managed surgically in the study hospital, Shree Birendra Hosptial, between 1 December 2021 to 30 May 2022. The study was conducted after the approval from the ethics committee.

Results: Out of 150 patients, 112 had open surgery and 38 underwent laparoscopic appendectomy. One hundred thirty-four had non-perforated appendix and 16 cases had perforated appendix. The older age group was associated with appendiceal perforation more than the younger age group. Patients with a duration of symptoms less than 24 h and more than 72 h developed perforated appendicitis less frequently. The odds of encountering perforated appendicitis increased by 2.644 times per 0.972 rise in total bilirubin (P= 0.004) and the odds of encountering perforated appendicitis increased by 6.474 times per 1.868 rise in conjugated bilirubin (P= 0.003). There was no significant difference in total leucocyte count and neutrophil percentage among perforated and non-perforated groups.

Conclusion: The diagnostic value of the CRP, total bilirubin, and conjugated bilirubin levels was strong and significant when used in combination rather than their individual performance in the diagnosis of perforated acute appendicitis.