Outcomes and Associated Factors of Pregnancy Related Acute Kidney Injury: A Retrospective Longitudinal Study

Abstract

Introduction: In developing countries, the incidence of Pregnancy-Related Acute Kidney Injury (PRAKI) has significantly decreased over the past three decades. However, it remains a major contributor to maternal and foetal morbidity and mortality. Aim: This retrospective longitudinal study aims to determine the aetiology, outcomes, and factors associated with maternalfoetal outcomes of PRAKI. Materials and Methods: The study was conducted at a tertiary care Medical College Hospital in Dharwad district, Karnataka, India. It included patients with AKI during pregnancy and the peripartum period, admitted between January 2014 and December 2021. A total of 156 subjects at risk of PRAKI were identified. Data was collected from the Medical Records Department (MRD), and three months of patient follow-up data were also collected. PRAKI diagnosis and staging were done using the Acute Kidney Injury Network (AKIN) criteria. Primary outcomes included the need for dialysis, renal recovery, renal biopsy findings, and development of CKD. Secondary outcomes were maternal and foetal mortality and birth weight. Data analysis was performed using Statistical Package for Social Sciences (SPSS) version 21.0. Results: The mean age of the participants was 26.34±4.67 years. The most common cause of PRAKI was Pregnancy Induced Hypertension (PIH) (75 cases, 48.1%), followed by sepsis (67 cases, 42.90%), and Haemolysis, Elevated Liver enzymes, Low Platelet count (HELLP) syndrome (32 cases, 20.50%). Out of the 156 PRAKI patients, one-fourth (42 cases, 26.92%) required haemodialysis, 126 (93%) achieved complete renal recovery, 12 (7.6%) required renal biopsy, 9 (6.6%) developed chronic kidney disease, and 3 (2.2%) developed end-stage renal disease (ESRD). Maternal mortality was observed in 21 patients (13.46%), and foetal mortality occurred in 47 patients (31%) out of 156 perinatal outcomes. Conclusion: PRAKI was associated with poor maternal and neonatal outcomes. PIH, followed by sepsis, remained the leading cause of PRAKI. Immediate referral of patients to a higher centre and comprehensive antenatal care in peripheral areas can reduce the overall health and economic burden.

Keywords

• maternal mortality
• perinatal mortality
• renal biopsy
• renal recovery