Acute kidney injury due to diarrhoeal diseases in children: a systematic review

Introduction: Acute kidney injury (AKI) is a major health concern, disproportionately affecting children in low- and lower-middle-income countries (LLMICs). Diarrhoeal diseases, a leading cause of paediatric morbidity and mortality, are significant contributors to AKI. Methods: This study systematically reviewed literature published post-2000 on three groups of children: those hospitalised with diarrhoea who developed AKI (Diarrhoea/AKI), those hospitalised with AKI attributable to diarrhoea (AKI/Diarrhoea), and those with diarrhoea-associated haemolytic uraemic syndrome (D-HUS). Results: After screening 1895 titles and abstracts, 92 studies were included. Most focused on D-HUS (76%), with fewer addressing AKI/Diarrhoea (15%) and Diarrhoea/AKI (9%). Studies were predominantly retrospective and high-income country (HIC)-based. In children hospitalised with diarrhoea, mean AKI prevalence was higher in LLMICs than in HICs (43.2±30.5% vs 10.1±12.7%). Similarly in children hospitalized with AKI, diarrhoea was more frequent in LLMICs compared with HICs (23.8±12.3% vs . 16.1±5.9%). Among children with D-HUS, 60% required dialysis, and mortality was substantially higher in LLMICs compared with HICs (28.5±17.43% vs . 3.7±3.6%). Conclusion: Diarrhoea is a common yet underreported associated clinical finding among children with AKI, particularly in resource-limited settings. Enhanced monitoring of kidney outcomes in children with diarrhoea is essential to address the overlapping burden of these conditions and improve outcomes globally.