Diabetes and COVID-19: analysis of the clinical outcomes according to the data of the Russian Diabetes Registry.

BACKGROUND : Data on the national level and worldwide show a higher rate of mortality in patients with diabetes mellitus (DM) due to COVID-19, which determines the high relevance of risk factor analysis for outcomes in DM patients to substantiate the strategy for this category of patients. AIM : To assess the effect of clinical and demographic parameters (age, gender, body mass index (BMI), glycemic control (HbA 1c ), and antidiabetic and antihypertensive drugs, including ACE inhibitors and ARBs) on clinical outcomes (recovery or death) in patients with type 2 DM. MATERIALS AND METHODS : A retrospective analysis of the Russian Register of Diabetes database was performed, including patients with type 2 DM ( n =309) who suffered pneumonia/COVID-19 in the period from 01.02.2020 to 27.04.2020 and the indicated outcome of the disease (recovery or death) RESULTS : The percentage of lethality was determined to be 15.2% (47 of 309 people). The degree of lethality was found to be significantly higher in males (OR=2.08; 95% CI 1.1–3.9; p =0.022) and in patients on insulin therapy (OR=2.67; 95% CI; 1.42–5.02; p =0.002), while it was significantly lower in patients with an age <65 years (OR=0.34; 95% CI 0.18–0.67; p =0.001) and in patients receiving metformin (OR=0.26; 95% CI 0.14–0,5; p <0.0001), antihypertensive therapy (OR=0.43; 95% CI 0.22–0.82; p =0.009), β-blockers (OR=0.26; 95% CI 0.08–0.86; p =0.018), diuretics (OR=0.4; 95% CI 0.17–0.93; p =0.028) and renin-angiotensin system blockers (ACE inhibitors or ARBs) (OR=0.36; 95% CI 0.18–0.74; p =0.004). A tendency to an increase in lethality at higher rates of HbA 1c and BMI was present, but it did not reach a statistical significance. Differences between patients receiving insulin therapy and those who were not receiving the insulin therapy were observed as follows: a significantly longer duration of type 2 DM (13.4 vs. 6.8 years, respectively; p <0.0001), worse overall glyacemic control (HbA 1c : 8.1% vs. 7.0%, resp.; p <0.0001), and three times more frequent failure to achieve the HbA 1c goal by more than 2.5% (14.7% vs. 5.9%, resp.; p =0.04). CONCLUSION : The identified risk factors for lethality in patients with type 2 DM indicate that good glycemic control and previous treatment with metformin and antihypertensive drugs (including RAS blockers) could reduce the frequency of deaths. In patients on insulin therapy, a higher lethality degree was associated with worse glycemic control.