Exercise-induced left bundle branch block and subsequent mechanical left ventricular dyssynchrony -resolved with pharmacological therapy
نویسندگان
چکیده
A 53-year-old man with depressed ejection fraction (EF) of 35% and QRS width of 88 ms at rest was admitted to our institution with a complaint of exertional chest discomfort and dyspnea. During treadmill exercise, left bundle-branch block (LBBB) with a QRS width of 152 ms occurred at a heart rate of 100 bpm. During LBBB, the patient showed significant mechanical dyssynchrony as evidenced by a two-dimensional speckle tracking radial strain of 260 ms (≥ 130 ms), defined as the time difference between anterior-septum and posterior wall. Five-month after carvedilol and candesartan administration, EF had improved to 49% and LBBB did not occur until a heart rate of 126 bpm was attained during treadmill exercise. It appears that pharmacological therapy may be useful for patients with heart failure and exercise-induced LBBB.
منابع مشابه
Author's response to reviews Title: Exercise-Induced Left Bundle Branch Block and Subsequent Mechanical Left Ventricular Dyssynchrony -Resolved with Pharmacological Therapy- Authors:
Hidekazu Tanaka ([email protected]) Mana Hiraishi ([email protected]) Tatsuya Miyoshi ([email protected]) Takayuki Tsuji ([email protected]) Akihiro Kaneko ([email protected]) Keiko Ryo ([email protected]) Kohei Yamawaki ([email protected]) Yuko Fukuda ([email protected]) Kazuko Norisada ([email protected]) Kazuhiro Tatsumi (kt...
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