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Aim. To evaluate the survival and dynamics of clinical and instrumental data in patients with chronic heart failure (CHF), atrial fibrillation (AF) and cardiac contractility modulation (CCM).Methods. There were included 54 patients (40 men, median age 59.7 [56.6; 63.9] years) with signs of CHF II (n=27, 50%) functional class and III (n=27, 50%) NYHA functional class, significantly decreased left ventricular ejection fraction (LVEF=30 [24,7; 35,5]%), LV dilatation and paroxysmal (n=27, 50%) or permanent (n=27, 50%) AF. In all patients, devices for CCM were implanted. The dynamics of clinical and instrumental parameters were assessed in 2, 6, 12 and 24 months after implantation. The actual survival patients with CCM was compared with the predicted survival calculated using the Seattle model of heart failure and MAGGIC risk score.Results. In 14 (28%) of patients CCM resulted in significantly increased clinical, echocardiographic parameters (increase in LVEF by 15 [11; 20]%, decrease in end-systolic volume by 68,5[37.5;104.5] ml and end-diastolic volume by 44 [30,100] мл), increase in walking distance during 6-minute walking test and decrease of NT-proBNP. The only factor significant for maximal response was non-ischemic etiology of CHF (χ2=4.54, p=0.034). During 2 years 21 (42%) patients died. The all-cause mortality in patients with CCM to the first year of observation was 16%, two-year all-cause mortality - 40%. These figures turned out to be significantly higher than predicted according to the Seattle model (χ2=10.93, p=0.001). The predicted and actual risk of death at 12-month follow-up turned out to be comparable when assessing survival parameters according to the MAGGIC scale. (χ2=2.24, p=0.134).Conclusion. CCM therapy in some patients with CHF of non-ischemic etiology can lead to an improvement of all clinical and instrumental characteristics. At the same time, there is no effect of CCM on the prognosis of patients with CHF. This fact may suggest the need of additional studies with increased number of cases.
Aim. To evaluate the survival and dynamics of clinical and instrumental data in patients with chronic heart failure (CHF), atrial fibrillation (AF) and cardiac contractility modulation (CCM).Methods. There were included 54 patients (40 men, median age 59.7 [56.6; 63.9] years) with signs of CHF II (n=27, 50%) functional class and III (n=27, 50%) NYHA functional class, significantly decreased left ventricular ejection fraction (LVEF=30 [24,7; 35,5]%), LV dilatation and paroxysmal (n=27, 50%) or permanent (n=27, 50%) AF. In all patients, devices for CCM were implanted. The dynamics of clinical and instrumental parameters were assessed in 2, 6, 12 and 24 months after implantation. The actual survival patients with CCM was compared with the predicted survival calculated using the Seattle model of heart failure and MAGGIC risk score.Results. In 14 (28%) of patients CCM resulted in significantly increased clinical, echocardiographic parameters (increase in LVEF by 15 [11; 20]%, decrease in end-systolic volume by 68,5[37.5;104.5] ml and end-diastolic volume by 44 [30,100] мл), increase in walking distance during 6-minute walking test and decrease of NT-proBNP. The only factor significant for maximal response was non-ischemic etiology of CHF (χ2=4.54, p=0.034). During 2 years 21 (42%) patients died. The all-cause mortality in patients with CCM to the first year of observation was 16%, two-year all-cause mortality - 40%. These figures turned out to be significantly higher than predicted according to the Seattle model (χ2=10.93, p=0.001). The predicted and actual risk of death at 12-month follow-up turned out to be comparable when assessing survival parameters according to the MAGGIC scale. (χ2=2.24, p=0.134).Conclusion. CCM therapy in some patients with CHF of non-ischemic etiology can lead to an improvement of all clinical and instrumental characteristics. At the same time, there is no effect of CCM on the prognosis of patients with CHF. This fact may suggest the need of additional studies with increased number of cases.
Aim. Evaluate the overall effectiveness of cardiac contractility modulation (CCM) therapy in patients with chronic heart failure of various etiology.Methods. The study included 61 patients with chronic heart failure (NYHA class II-III), ejection fraction 20-40% and narrow QRS <130 ms, who were implanted the CCM devices. Depending on the etiology of heart failure, ischemic cardiomyopathy prevailed (41 patients). All patients were performed echocardiography, 6-min walk test and Minnesota Living with Heart Failure questionnaire (MHFLQ). Results. The observation period was 25 months. All 54 patients significantly improved left ventricular ejection fraction from 32.2% to 37.6% (р=0.026) and volume parameters (left ventricle end systolic volume from 150 to 137 ml (р=0.034), left ventricle end diastolic volume from 220 to 201 ml (р=0.044), reduced the heart failure NYHA class >1 in 29 (53.7%) patients (р=0.015), increased 6-min walk test from 265 to 343 m (р=0.029), and the MHFLQ improved from 46.1 to 35.8 (р=0.042). Non-ischemic cardiomyopathy was associated with significant improvement in MHFLQ (from 42.7 to 30.3, р=0.029) and lowering the heart failure NYHA class>1 (83.3%, vs 47.2%, p=0.012) compared to ischemic group. Conclusion. CCM is safe and effective in patients with chronic heart failure NYHA class II-III, ejection fraction 20- 40% and narrow QRS˂130 ms, who were implanted the CCM devices. Depending on the etiology of heart failure, ischemic cardiomyopathy prevailed (41 patients). All patients were performed echocardiography, 6-min walk test and Minnesota Living with Heart Failure questionnaire (MHFLQ).Results. The observation period was 25 months. All 54 patients significantly improved left ventricular ejection fraction from 32.2% to 37.6% (р=0.026) and volume parameters (left ventricle end systolic volume from 150 to 137 ml (р=0.034), left ventricle end diastolic volume from 220 to 201 ml (р=0.044), reduced the heart failure NYHA class >1 in 29 (53.7%) patients (р=0.015), increased 6-min walk test from 265 to 343 m (р=0.029), and the MHFLQ improved from 46.1 to 35.8 (р=0.042). Non-ischemic cardiomyopathy was associated with significant improvement in MHFLQ (from 42.7 to 30.3, р=0.029) and lowering the heart failure NYHA class>1 (83.3%, vs 47.2%, p=0.012) compared to ischemic group.Conclusion. CCM is safe and effective in patients with chronic heart failure NYHA class II-III, ejection fraction 20- 40% and narrow QRS˂130 ms. Non-ischemic etiology of cardiomyopathy was associated with significant improvement in MHFLQ and lowering the heart failure class.
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