Intrathoracic Impedance Changes Reflect Reverse Left Ventricular Remodeling in Response to Cardiac Resynchronization Therapy in Chronic Heart Failure Patients
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概要
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Intrathoracic impedance monitoring has been reported to be useful for prediction of worsening chronic heart failure (CHF). However, it has not revealed the relation between changes in intrathoracic impedance and improvement of cardiac function in CHF patients with cardiac resynchronization therapy (CRT) implantation. Therefore, we investigated whether intrathoracic impedance change reflects reverse left ventricular (LV) remodeling in response to CRT in patients with CHF. The study subjects consisted of 29 CHF patients (23 males, mean age 64 ± 12 years) with CRT-defibrillator (CRT-D) implantation. The patients were divided into two groups based on whether the Opti-vol Fluid Index® reached over 60 ohms (group A, n = 7) or not (group B, n = 22) within 6 months of observation after CRT-D implantation. Levels of plasma B-type natriuretic peptide (BNP) were measured, and LV end-diastolic volume (LVEDV), LV end-systolic volume (LVESV), and LV ejection fraction (LVEF) were evaluated before and 6 months after CRT-D implantation. In group B, BNP (556 ± 88 pg/mL versus 330 ± 70 pg/mL, P < 0.05), LVEDV (177 ± 18 mL versus 149 ± 14 mL, P < 0.01), and LVESV (128 ± 14 mL versus 100 ± 12 mL, P < 0.01) were significantly decreased 6 months after CRT-D implantation. LVEF (28 ± 2% versus 35 ± 2%, P < 0.01) was significantly increased after CRT-D implantation. On the other hand, no significant changes were detected in any parameters in group A. These data showed intrathoracic impedance changes reflected reverse LV remodeling in response to CRT in patients with CHF. Therefore, the monitoring of changes in intrathoracic impedance is useful for predicting CRT responders in patients with CHF.
著者
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Yamada Shinya
Department Of Applied Biological Chemistry Faculty Of Agriculture Tohoku University
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Suzuki Hitoshi
Department Of Animal Science Faculty Of Agriculture Tohoku University
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SAITOH Shu-ichi
Department of Cardiology and Hematology, Fukushima Medical University
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Takeishi Yasuchika
Department Of Advanced Cardiac Therapeutics Fukushima Medical University
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Kamiyama Yoshiyuki
Department of Cardiology and Hematology Fukushima Medical University
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Kaneshiro Takashi
Department of Cardiology and Hematology, Fukushima Medical University
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