Impact of COVID-19 on nephropathy in diabetes mellitus type-II patients: a systematic literature review and meta-analysis.

Background: Recent reports have revealed that nephropathy leading to kidney injury (KI) is a prevalent complication of COVID-19 and is linked to high mortality and morbidity in diabetes mellitus type II (DM-T-II) patients. This systematic literature review and meta-analysis aimed to critically analyze existing studies and evidence on the impact of COVID-19 on nephropathy and kidney injury in diabetes mellitus type II (DM-T-II) patients.

Method: A systematic search was conducted in the Web of Science (WoS), PubMed and Cochrane databases for relevant studies published between March 2020 and July 2023. To ensure the integrity of the systematic literature review and meta-analysis, observational studies that specifically reported post-COVID-19 kidney injury in DM-T2 patients were included, whereas we did not include articles in the press, meta-analyses, case reports, case series, Diabetes Type-I articles or non-English papers. The primary outcome was kidney injury in patients with type II diabetes after contracting COVID-19. The protocol for this study was published on PROSPERO (registration number CRD42023413887).

Results: Initially, 6,339 articles were included in the search, from which only 6 observational studies were selected by following the 2020 PRISMA statement. The quality of the evidence was assessed by a tool provided by the National Institutes of Health (observational studies). The total number of participants included in the studies was 14,723. Our systematic literature review and meta-analysis provide compelling evidence that kidney injury is a prevalent complication of COVID-19 infection in the type II diabetes population, with a pooled odds ratio of 2.27 (95% CI: 2.05-2.51; p < 0.00001), often necessitating hospitalization and hemodialysis in severe cases.

Conclusion: Covid-19 is associated with a two-fold increase in nephropathy and acute kidney injury in diabetes mellitus type 2 patients compared to non-diabetic patients. This implies that kidney injury is more likely to occur in diabetes mellitus type 2 patients post Covid infection.