PMC5412635_01
A: During infusion of dobutamine (5 mcg/kg/min) with a rate just under 1-bpm, a mid left ventricular gradient >100mm Hg is noted by continuous wave Doppler. B: During ventricular pacing at 100 bpm, there is complete resolution of the midventricular gradient.
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During dobutamine infusion of 5 mug/kg/min, a 118 mm Hg dynamic gradient was recorded (Figure 1A). Atrioventricular pacing at 100 beats per minute immediately and completely abolished this gradient (Figure 1B).