File:Brockenbrough-Braunwald-Morrow sign.jpg

English⧼Colon⧽ Concurrent measurement of left ventricular and aortic pressures after isoproterenol administration exhibiting evidence of 120 mm Hg gradient (blue oval at lower panel). Also, an intensified left ventricular-aortic gradient (red oval at lower panel) was noted after premature ventricular contraction (green oval at upper panel). A case of a 77-year-old woman with a history of hypertrophic cardiomyopathy (HCM). Cardiac catherterisation: A left ventricular and aortic pressure gradient is recognized during isoproterenol administration. An intensified gradient was observed after a premature ventricular contraction (PVC) that is distinguished as the Brockenbrough-Braunwald-Morrow sign substantiating confirmation of left ventricular outflow tract (LVOT) obstruction.