Short- and long-term prognosis of glycemic control in COVID-19 patients with type 2 diabetes

Background and aim To systematically evaluate the associations between glycemic control and short- to long-term outcomes in coronavirus disease 2019 (COVID-19) patients with type 2 diabetes (T2D). Design and methods A multi-center prospective cohort study including 574 COVID-19 patients with T2D was conducted in Wuhan, China. All patients were followed-up 1 year after hospital discharge using a uniformed questionnaire including self-reported symptoms, and the chronic obstructive pulmonary disease assessment test items. Results Of the 574 patients, 443 (77.2%) had well-controlled blood glucose. Glycemic control was significantly associated with decreased risk of death [odds ratio (OR) 0.24, 95% confidence interval (CI) 0.10-0.57], intensive care unit admission (OR 0.22, 95% CI 0.10-0.49), invasive mechanical ventilation (OR 0.25, 95% CI 0.08-0.72), disease progression (OR 0.25, 95% CI 0.11-0.55), and composite outcome (OR 0.26, 95% CI 0.14-0.49). The top five long-term sequelae include fatigue (31.5%), sweating (21.2%), chest tightness (15.1%), anxiety (12.2%), myalgia (10.6%) and short breath (6.4%). Glycemic control was associated with decreased risk of respiratory sequelae (OR 0.42, 95% CI 0.18-0.99; P = 0.048). Conclusions Glycemic control was significantly associated with short-term outcomes in COVID-19 patients with T2D and showed a significant association with long-term respiratory sequelae. The management and control of blood glucose has a positive impact on prognosis of COVID-19.