Outcomes of HIV-exposed infected and HIV-exposed uninfected children admitted to two paediatric intensive care units in South Africa: A retrospective analytical cohort study

Background. Reduced vertical transmission of HIV has led to an increased proportion of HIV-exposed uninfected children (HEU) in South Africa. Increased infective morbidity and mortality creates a need to better understand outcomes and morbidity in this population. Objectives. To describe and compare critical care outcomes in terms of survival and disease severity between HIV-unexposed children (HUU), HIV-exposed infected children (HEI) and HEU. Methods. A retrospective analytical cohort study was carried out from 1 January 2017 to 31 December 2021. Paediatric intensive care unit admissions of children aged 1 month - 5 years were included. Outcomes for HEU and HEI were compared with those of HUU, with a significance threshold set at p=0.05. Multivariate logistic regression analysis was conducted. Results. Of 1 015 children, 633 (62.4%) were HUU, 318 (31.3%) were HEU and 64 (6.3%) were HEI. Mortality was higher in HEU (15.8%; p=0.1) and HEI (17.2%; p=0.4) compared with HUU (11.4%), but this was not statistically significant. HEU and HEI were younger (p<0.001) and more frequently underweight (p<0.001). HEU (and HEI) had an increased risk of acute kidney injury (AKI) (odds ratio 1.19; 95% confidence interval 1.07 - 1.81; p=0.014) and a lower minimum estimated glomerular filtration rate (p<0.001) compared with HUU. Septic shock was more frequent in HEU (28.6%; p=0.001) and HEI (43.8%; p<0.001) compared with HUU (20.1%). HEI had more frequent mechanical ventilation (p=0.003), more prolonged mechanical ventilation (p<0.001) and lower admission haemoglobin concentrations (p<0.001) than HUU. Conclusion. Compared with HUU, both HEU and HEI demonstrated a trend towards increased mortality, but this was not statistically significant. HEU and HEI experienced increased AKI and other morbidity.