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Impact of optimal heart rate on left ventricular reverse remodeling and functional improvement in patients with systolic heart failure

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Abstract

Heart rate modulation therapy using ivabradine reduces mortality and morbidity in patients with systolic heart failure, whereas too reduced heart rate seems to worsen the clinical outcome. The optimal heart rate during heart rate modulation therapy remains unknown. Consecutive patients with left ventricular ejection fraction < 50% who received echocardiographic assessments and simultaneous heart rate measurements were retrospectively investigated. Theoretically ideal heart rate was calculated using a previously proposed formula: 93 − 0.13 × (deceleration time [msec]). Impacts of heart rate on the 1-year echocardiographic left ventricular reverse remodeling were compared among the three groups stratified by the heart rate status: optimal heart rate group (within 10 bpm of ideal heart rate), below-optimal heart rate group (< 10 bpm of ideal heart rate), and above-optimal heart rate group (> 10 bpm of ideal heart rate). A total of 75 patients (70 years old, 60 men) were included. There were no significant differences in the baseline characteristics among the three groups, except for the higher prevalence of tolvaptan use and higher plasma B-type natriuretic peptide level in the below-optimal heart rate group. Left ventricular end-diastolic diameter (from 55 to 54) and left ventricular ejection fraction (from 39 to 46) improved significantly only in the optimal heart rate group at 1-year follow-up (p < 0.05 for both). Optimal heart rate, which was calculated using a formula consisting of deceleration time, was associated with cardiac reverse remodeling in patients with systolic heart failure. Prospective study to investigate the implication of deceleration time-guided aggressive heart rate optimization is the next concern.

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TI receives grant support from JSPS KAKENHI: JP20K17143.

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Correspondence to Teruhiko Imamura.

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Izumida, T., Imamura, T., Ueno, Y. et al. Impact of optimal heart rate on left ventricular reverse remodeling and functional improvement in patients with systolic heart failure. Heart Vessels 36, 1688–1693 (2021). https://doi.org/10.1007/s00380-021-01864-5

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