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2. 設定された15 回のATP が作動せず6 回でATP が毎回中断した1 例
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JPY
Abstract
Case:We experienced 49 year‒old Japanese male with hypertrophic cardiomyopathy and sustained ventricular tachycardia. He was treated with VT ablation and ICD (Boston Scientific, INCEPTA). The therapy of VT‒1 zone above 140 bpm was ATP Burst 10 times and ATP Ramp 5 times. The therapy of VT zone above 180 bpm was ATP Bust twice, Ramp twice, and Cardioversion. This patient experienced palpitation and ICD shock, which analysis revealed a repeated inappropriate cessation of ATP therapy. He had VT three times detected at VT‒1 zone. During every VT therapy, ATP was terminated at sixth ATP every time, although ATP was supposed to be conducted 15 times(Burst 10 times and Ramp 5 times). ICD of Boston Scientific have time limit of ATP therapy, called ATP timeout, which default setting is one minute. Because of the ATP timeout setting, this patient had ATP therapy stopped at sixth ATP which reached one minute every time. We elongated ATP timeout setting from one minute to ten minutes. Since ICD of Boston Scientific has ATP timeout set one minuet by default, we should be careful when we set multiple ATPs.
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