Decreasing the Pressure Gradient of the Left Ventricular Outflow Tract by Single-lead VDD Pacing in a Patient with Hypertrophic Obstructive Cardiomyopathy

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A 59-year-old woman with hypertrophic cardiomyopathy of 8 years duration, who had been taking ﾎｲ-blocker, was admitted to our hospital for exertional dyspnea and previous syncope. Cardiac catheterization showed a prominent left-ventricular outflow tract (LVOT) pressure gradient, and hypertrophic obstructive cardiomyopathy (HOCM) was diagnosed. To reduce LVOT obstruction, we implanted a single-lead VDD-mode pacemaker. Cardiac catheterization after the implantation revealed a remarkable decrease in the LVOT pressure gradient with short atrioventricular delay, 80 msec, and her symptoms disappeared. A singlelead VDD pacemaker is also a useful treatment for an HOCM patient due to the relative ease with which it can be implanted.

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