COVID-19 in people with diabetes: understanding the reasons for worse outcomes

Matteo Apicella, Maria Cristina Campopiano, Michele Mantuano, Laura Mazoni, Alberto Coppelli, Stefano Del Prato, Matteo Apicella, Maria Cristina Campopiano, Michele Mantuano, Laura Mazoni, Alberto Coppelli, Stefano Del Prato

Abstract

Since the initial COVID-19 outbreak in China, much attention has focused on people with diabetes because of poor prognosis in those with the infection. Initial reports were mainly on people with type 2 diabetes, although recent surveys have shown that individuals with type 1 diabetes are also at risk of severe COVID-19. The reason for worse prognosis in people with diabetes is likely to be multifactorial, thus reflecting the syndromic nature of diabetes. Age, sex, ethnicity, comorbidities such as hypertension and cardiovascular disease, obesity, and a pro-inflammatory and pro-coagulative state all probably contribute to the risk of worse outcomes. Glucose-lowering agents and anti-viral treatments can modulate the risk, but limitations to their use and potential interactions with COVID-19 treatments should be carefully assessed. Finally, severe acute respiratory syndrome coronavirus 2 infection itself might represent a worsening factor for people with diabetes, as it can precipitate acute metabolic complications through direct negative effects on β-cell function. These effects on β-cell function might also cause diabetic ketoacidosis in individuals with diabetes, hyperglycaemia at hospital admission in individuals with unknown history of diabetes, and potentially new-onset diabetes.

Copyright © 2020 Elsevier Ltd. All rights reserved.

Figures

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Figure
Synopsis of the reciprocal effects of diabetes and COVID-19 The relationship between diabetes and COVID-19 is biunivocal. On one hand, people with diabetes have worse outcomes because of multiple associated conditions enhancing the risk. On the other hand, SARS-CoV-2, because of its tropism for the β-cell, might cause new-onset diabetes or sustain hyperglycaemia at hospital admission. The impairment of β-cell function along with the inflammatory cytokine storm and counter-regulatory hormonal responses can precipitate further acute metabolic complications (DKA or HHS). New-onset diabetes, hyperglycaemia at admission, and acute metabolic deterioration, in turn, can further worsen COVID-19 outcomes. DKA=diabetic ketoacidosis. HHS=hyperglycaemic hyperosmolar syndrome.

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