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Pressure tracings show a sharp rise in LV outflow gradient that follows the pause associated with PVC. A dynamic obstruction leads to a concomitant fall in aortic pressure and a disproportionate (46 to 130 mmHg) increase in gradient. This phenomenon, known as the Brockenbrough-Braunwald-Morrow sign, is part of the classical description of hypertrophic obstructive cardiomyopathy. Ao: aorta; ECG: electrocardiogram; LV: left ventricle; PVC: premature ventricular complex.
