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Time course of the left ventricular outflow tract (LVOT) obstruction on ultrasound echocardiography. (A) The LVOT obstruction had a pressure gradient of 156 mmHg after optimal medical therapy prior to dual-chamber pacing. (B) After 1 week of dual-chamber pacing, the LVOT pressure gradient decreased to 68 mmHg. (C) After 3 weeks of dual-chamber pacing, the LVOT pressure gradient decreased to 26 mmHg.
