Chronic systolic heart failure: association of remodeling of the right heart and renal dysfunction with cardiac arrhythmias

Introduction. Ischemic (ICMP) and dilated cardiomyopathy (DCMP) are the leading causes of chronic heart failure (CHF) with the most frequent indication for heart transplantation. The similarity of these diseases consists in the widespread and high mortality rate due to pathological remodeling of both the left and right chambers of the heart, which is accompanied by the progression of CHF, increasing the risk of sudden cardiac death. The purpose of the study . To study the relationship of systolic function of the left ventricle (LV) with remodeling of the right heart, renal dysfunction and their relationship with cardiac arrhythmia. Materials and methods . The study included 72 patients with CHF with reduced ejection fraction (CHFrEF), who were being treated at the N. V. Sklifosovsky Scientific Research Institute of EM in connection with worsening CHF. Group I consisted of 48 patients with DCMP; group II – 24 patients with ICMP. Results . LV ejection fraction (LV EF) in patients of both groups was <30 %, but it was significantly lower in group I (p=0.001). The EF of the right ventricle (RV) in group I was low and amounted to 24.6 [19.5; 28.5]%. In group I, the volume of the right atrium (PP) and the size of the pancreas correlated with LV EF (r= –0.489, p=0.015 and r= –0.410, p=0.005, respectively); each subsequent increase in the volume of right atrium (RA) by 1 ml increased the likelihood of atrial fibrillation (AF) by 1.018 times (OR: 1.018, 95 % CI: 1.0042–1.033, p=0.011). The estimated glomerular filtration rate (eGFR) <60 ml/min/1.73 m 2 increased the chances of ventricular tachycardia (VT) by 9.5 times (OR: 9.5, 95 % CI: 2.32–38.87, p=0.002). Each subsequent decrease in eGFR by 1 ml/min/1.73 m 2 increased the chances of developing VT by 1.03 times (OR: 0.967, 95 % CI: 0.937–0.988, p=0.036)]. Conclusions . In patients with CHFrEF, regardless of the etiology, a decrease in LV EF leads to structural and functional changes in the right parts of the heart. In individuals with DCMP, an increase in RA volume by 1 ml increases the likelihood of AF by 1.018 times; a decrease in eGFR by 1 ml/min/1.73 m 2 increases the chances of developing VT by 1.03 times.