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  • Insignificant increase...

Insignificant increase in A1C in those with and without diabetes after COVID-19 infection

Medha BaranwalWritten by Medha Baranwal Published On 2022-03-23T10:00:34+05:30  |  Updated On 23 March 2022 4:23 AM GMT
Insignificant increase in A1C in those with and without diabetes after COVID-19 infection

There is statistically significant but clinically insignificant increase in A1c in people following COVID-19 infection in both those with and without diabetes, according to a new retrospective, observational, case-control study of more than 20,000 people from a single US medical center.

The study has shown a statistically significant but clinically insignificant increase in A1c in people following COVID-19 infection, in both those with and without diabetes. Further after receiving a diagnosis of COVID-19 infection patients were 40% more likely to also receive a diagnosis of type 2 diabetes compared with people who tested negative for COVID-19, a difference that was significant and could be explained by the increased medical care received by people who test positive for COVID-19. The study published in medRxiv.org further found that risk of incident diabetic ketoacidosis (DKA) among people who tested positive for COVID-19 was significantly higher among those with preexisting type 2 diabetes, those using insulin, and among Black individuals.

Until now the impact of COVID-19 infection on A1c remained unclear. Results from previous studies indicated that COVID-19 infection may increase A1c levels, but the studied cohorts were small and lacked uninfected controls.

In the study researchers retrospectively selected patients with an A1c recorded within 12 months before their COVID-19 test as well as a second A1c value recorded within 12 months after COVID-19 testing. This produced a study cohort of 8755 COVID-positive people and 11,998 matched people who tested negative for COVID-19. Thea data came from a Cleveland Clinic registry that included 81,093 people who tested positive for COVID-19 between March 2020 and May 2021 and 153,034 matched individuals who tested negative for COVID-19 during the same period. The authors identified two sub-cohorts that excluded those with a history of DKA. The sub-cohorts were 701 people with type 1 diabetes, and 21,830 with type 2 diabetes to evaluate risk of DKA.

The investigators found a statistically significant but clinically insignificant A1c increase following a positive COVID-19 test in people with and without type 2 diabetes prior to infection, an average A1c increase of 0.06 percentage points. Those who tested negative for COVID-19 had a clinically insignificant change in their average A1c level that was of borderline statistical significance, an average increase of 0.02 percentage points, P = .0. The researchers saw significant positive associations between higher A1c levels before infection and time to hospitalization (hazard ratio, 1.07), need for assisted breathing (HR, 1.06), and ICU admission (HR, 1.07) in patients with type 2 diabetes who became infected with COVID-19.

Among the 21,830 people with preexisting type 2 diabetes, the DKA risk was a significant 35% greater for those who were infected with COVID-19 compared with those who were uninfected. The magnitude of this increased relative risk was even higher among the patients with type 2 diabetes who used insulin as part of their treatment. The difference in DKA risk didn't differ between Black and White patients who were not infected with COVID-19, but among those infected by COVID-19, Black patients were more than twice as likely to be diagnosed with DKA compared with White patients, a significant difference. Blacks diabetics with COVID-19 infection had a significant 63% increased rate of DKA compared with Black patients with type 2 diabetes who remained uninfected.

The clinical interpretation of the study is that DKA risk is increased in T2D patients on insulin and in Black patients with T2D after COVID-19 infection.T2D risk is greater in COVID-19(+) patients for the same HbA1c increase in COVID-19(-) patients, indicating that T2D risk attributed to COVID-19 may be due to increased recognition during COVID-19 management.

For further reference log on to:

doi: https://doi.org/10.1101/2022.03.08.22272041

COVID-19 type 2 diabetes diabetic ketoacidosis glycemia medRxiv 
Source : medRxiv.org
Medha Baranwal
Medha Baranwal

    MSc. Biotechnology

    Medha Baranwal joined Medical Dialogues as an Editor in 2018 for Speciality Medical Dialogues. She covers several medical specialties including Cardiac Sciences, Dentistry, Diabetes and Endo, Diagnostics, ENT, Gastroenterology, Neurosciences, and Radiology. She has completed her Bachelors in Biomedical Sciences from DU and then pursued Masters in Biotechnology from Amity University. She has a working experience of 5 years in the field of medical research writing, scientific writing, content writing, and content management. She can be contacted at  editorial@medicaldialogues.in. Contact no. 011-43720751

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