Association between Statin Use and Poor Outcomes in COVID-19 Patients with Diabetes Mellitus: A Systematic Review

BACKGROUND AND AIMS: Diabetes mellitus, cardiovascular diseases, obesity, and dyslipidaemia are considered risk factors for more severe forms of COVID-19 infection. Statins have been widely used in such patients to prevent the occurrence of cardiovascular events and the associated mortality. However, statin use has been suggested to promote a more severe form of infection. This review aims to investigate the association between statin use and poor outcomes in COVID-19 patients with diabetes. METHODS: Literature search was performed in PubMed, CENTRAL, Scopus, and pre-print databases (MedRxiv and BioRxiv), and studies published up to March 6th, 2021 have been reviewed. Selected studies were then assessed for risk of bias with the Newcastle Ottawa Scale. RESULT: Four studies were included in the final analysis; all were retrospective studies. Two studies reported a decreased risk of mortality with statin use, while one study reported opposite findings. The other one did not find a significant association between statin use and poor COVID-19 outcomes. CONCLUSION: Available data suggest that statins may be safely administered to diabetic COVID-19 patients as the majority of evidence signifies statins to confer benefits and improve clinical outcomes in COVID-19 patients.