Incidence and histological outcomes of appendectomies in a South African regional hospital, 2022 - 2023: A retrospective study.

Abstract

Background: Acute appendicitis is one of the most common surgical emergencies in South Africa (SA), yet local histopathological data on appendectomies remain limited.

Objective: To determine the incidence and histological patterns of appendicitis at an SA regional hospital over a 2-year period.

Methods: A retrospective review was conducted on all appendectomies performed at Tambo Memorial Hospital (TMH) in Boksburg, SA, from 1 January 2022 to 31 December 2023. Histological data, using Gomes score, which was correlated with microscopy and macroscopy from the SA National Health Laboratory Service, as well as patient demographics, were analysed. Logistic regression and χ2 tests were used to assess associations between variables.

Results: A total of 283 appendectomies were reviewed. None was excluded. The cohort was predominantly male (64%), with a mean age of 26.99 years. Histologically normal appendices (grade 0) were found in 25.4% of cases. Grade 4 appendicitis (gangrenous/perforated) was the most prevalent pathological finding (39.9%). Males were significantly more likely to present with appendicitis, particularly advanced grades of appendicitis (p=0.00005; odds ratio (OR) 3.305, 95% confidence interval (CI) 1.869 - 5.915). Lymphoid hyperplasia was significantly associated with grade 0 appendices (p=0.00205; OR 0.282, 95% CI 0.125 - 0.631), suggesting possible alternative diagnoses such as gastroenteritis, mesenteric adenitis or pelvic inflammatory disease. Appendicular neoplasms (2.1%), faecoliths (17.3%) and parasites (1.4%) were not uncommon. No significant monthly variation was observed. The overall negative predictive value of clinician-directed appendectomy at TMH was 25.4%, in keeping with or better than rates reported at various tertiary hospitals - despite TMH lacking afternoon sonography and having no after-hours sonographic or radiological reporting services.

Conclusion: Appendicitis at TMH showed a high rate of complicated cases, especially among males. Male sex was a significant predictor of appendicitis, whereas lymphoid hyperplasia was associated with negative histology and may represent an important clinical differential diagnosis. Other findings included benign neoplasms, faecoliths and parasites. These findings highlight clinical acumen in a resource- limited setting and the value of histological confirmation in appendicitis diagnoses.