Invasive hemodynamic tracings of left ventricular and aortic pressures in hypertrophic cardiomyopathy and left ventricular outflow tract obstruction

Invasive hemodynamic tracings obtained during cardiac catheterization showing simultaneous left ventricular (LV) and aortic pressures in a patient with hypertrophic cardiomyopathy (HCM) and left ventricular outflow tract (LVOT) obstruction. During the first five heart beats, with one catheter in the LV and another catheter in the aorta, there is an 80 mmHg gradient across the left ventricular outflow tract. Following the fifth heart beat, the LV catheter is pulled back into the aorta, where both catheters are now measuring aortic pressure, and no gradient is present.