Antibiotic use practice and predictors of hospital outcome among patients with systemic bacterial infection: Identifying targets for antibiotic and health care resource stewardship

Abstract

Background Malpractice and excess use of antimicrobials have been associated with multiple costs, including the development of resistant bacteria, which has become a threat to the human health. The aim of this study, therefore, was to assess the antibiotic use practice and to identify predictors of hospital outcome to uncover targets for stewardship. Methods An Institution-based prospective observational study was performed from 9 April to 7 July 2014 in the internal medicine wards of Tikur Anbessa Specialized Hospital. Patients with suspected systemic bacterial infections during this period were strictly followed and data were abstracted using data abstraction format. Descriptive statistics and binary logistic regression were used for statistical analysis. Results About half of the attended patients had suspected systemic bacterial infections, in which pneumonia is the most common. Cephalosporins were the most widely prescribed class of drugs in all the wards. Initial antibiotics were empiric in almost all of the cases. About 28% of the ward and 59% of the ICU patients died during the in-hospital stay. The mean length of stay (LoS) was 18.5+12.2 in the wards and 8.9+4.9 days in the ICU. Whilst digestive disease (AOR = 6.94, 95% CI: 2.24, 21.49), different signs and symptoms of disease (AOR = 2.43, 95% CI: 1.30, 4.56), sepsis (AOR = 2.59, 95% CI: 1.12, 5.99) and vancomycin use (AOR = 2.60, 95% CI: 1.30, 5.21) were independent positive predictors, antibiotic days (> 10) (AOR = 0.37, 95% CI: 0.20, 0.70) was a negative predictor for mortality. On the other hand, hospital-acquired infection (AOR = 3.01, 95% CI: 1.05, 8.62), beyond the median antibiotic days (> 10) (AOR = 4.05, 95% CI: 1.96, 8.37) and agent days beyond 21 days (AOR = 2.18, 95% CI: 1.01–4.68) were independently associated with prolonged LoS. Conclusion Generally, this observation entails an appropriate infection management and antimicrobial use policy. Any future policy should better start by addressing cases like pneumonia, and sepsis and drugs like cephalosporins.