Abstract
Abstract Background Limited studies have focused on diagnosing type 2 diabetes mellitus (T2DM) and prediabetes in hospitalized patients with cardiovascular diseases (CVD) with their different phenotypes. In addition, HbA1c levels in patients admitted for cardiovascular reasons may be lower than in patients with symptoms of hyperglycemia. Purpose To assess the incidence of newly and previously diagnosed T2DM and prediabetes among patients hospitalized with CVD, depending on the reasons for admission. Methods In the single-center prospective study (registry) we enrolled 773 patients ≥40 years with established CVD and arterial hypertension (HTN) without type 1 diabetes mellitus, except for previously diagnosed T2DM and prediabetes who were admitted to the City Clinical hospital. We also assessed the reasons for admission. From 06.01.2018 to 03.01.2020 275 (35.6%) patients hospitalized with acute coronary syndrome (ACS), 163 (21.1%) with acute decompensated heart failure (ADHF), 157 (20.3%) with HTN, 75 (9.7%) with atrial fibrillation or flutter (AF), 67 (8.7%) with chronic coronary syndrome (CCS) and 36 (4.7%) with newly diagnosed T2DM. All of them screened for T2DM and prediabetes using HbA1c and fasting plasma glucose by ADA Guidelines. Results Screening results are shown in Picture 1. The overall incidence of T2DM or prediabetes in hospitalized patients with CVD was 55.9%, and before the screening, only 25.7% were diagnosed with T2DM or prediabetes. The highest incidence of T2DM or prediabetes, including previously diagnosed, was among patients admitted with ADHF – 71.2%, and the lowest, 46.2%, in those hospitalized with ACS. Picture 2 presents mean levels of HbA1c in patients with newly and previously diagnosed T2DM, depending on the reasons for admission. The highest HbA1c levels were identified in patients with CVD who were hospitalized with symptoms of hyperglycemia and in whom the diagnosis of T2DM was confirmed (р<0,001). However, patients hospitalized with ADHF, AF and CCS had a HbA1c level almost twice lower than in patients hospitalized with newly diagnosed T2DM and lower than in those hospitalized with ACS and HTN (р<0,001). At the same time, HbA1c levels in previously diagnosed T2DM did not differ significantly between groups. Conclusion Thus, about 1 out of 2 patients hospitalized with CVD have a T2DM or prediabetes, and more than a third of patients without a T2DM or prediabetes (41%) were previously undiagnosed. In addition, patients admitted with ADHF, AF, and CCS with newly diagnosed T2DM had lower levels of baseline HbA1c than patients with overt symptoms of hyperglycemia, ACS, and HTN. All this has a potential impact on the target groups of screening and initial therapy of T2DM, including new classes of drugs.Picture 1Picture 2