Background
In high resource settings, even mild anaemia is associated with an increased risk of postoperative complications. Whether this is true in low resource settings is unclear. We aimed to evaluate the effect of anaemia on surgical outcomes in the Republic of Congo and Madagascar.
Method
Retrospective chart review of 2064 non-pregnant patients undergoing elective surgery with Mercy Ships. Logistic regression was used to determine the association between pre-operative anaemia and predefined surgical complications, and adjusted for age, gender, surgical specialty, and country.
Results
The average age of patients was 27.2 years; 56.7% were male. 62% of patients were not anaemic, and 22.7%, 13.9% and 1.4% met sex-related criteria for mild, moderate and severe anaemia. In adjusted analyses, the severe anaemia group had an 8.58 [3.65, 19.49] higher odds of experiencing any surgical complication (p < 0.001) compared to non-anaemic patients. Analysis of each complication showed a 33.13 [9.57, 110.39] higher odds of unexpected ICU admission (p<0.001); a 7.29 [1.98, 21.45] higher odds of surgical site infection (p<0.001); and 7.48 [1.79, 25.78] higher odds of requiring hospital readmission (p<0.001). Evaluating other anaemia categories, only those with moderate anaemia had a higher risk of requiring ICU admission (odds ratio 2.75 [1.00, 7.04], (p = 0.04) compared to those without anaemia.
Conclusion
Our results indicate that in low income settings, severe anaemia is associated with an increased risk of postoperative complications including unexpected ICU admission, surgical site infection, and hospital readmission, whereas mild anaemia was not associated with increased postoperative complications.