Alternative Therapy With Ivabradine in Patients With Functional Class III Chronic Heart Failure

Aim of the study - to determine efficacy of therapy with the use of ivabradine in patients with functional class (FC) III chronic heart failure (CHF) on the basis of assessment of its action on regulatory adaptive status (RAS). We included into the study 100 patients with FC III CHF at the background of ischemic heart disease (IHD) and/or stage III hypertensive disease (HD) receiving complex therapy (quinapril, torasemide, spironolactone). After randomization group 1 comprised 56 patients (age 62.9 +/- 1.8 years) who were prescribed slow release metoprolol succinate (59.1 +/- 4.5 mg/day). Group 2 comprised 44 patients (age 59.4 +/- 1.3 years) who were prescribed If channel inhibitor ivabradine (12.1 +/- 2.3 mg/day) if beta-blocker use was not possible. Examination at baseline and in 6 months included treadmillometry with assessment of maximal oxygen consumption (VO2 max) at exercise, echocardiography, 24-hour blood pressure monitoring, measurement of N-terminal pro-brain natriuretic peptide (NT-proBNP) in blood plasma. For objective qualitative assessment of the state of RAS we uased a test of cardiorespiratory synchronism. Therapy with the use of ivabradine improved structural and functional state of the myocardium, elevated tolerance to exercise, caused positive changes of NT-proBNP concentration in blood plasma and VO2 max at exercise. Thus ivabradine probably can serve as alternative to beta-adrenoblockers when their use is not possible patients with FC III CHF at the background of IHD and/or stage III HD.