File:Brockenbrough-Braunwald-Morrow sign.jpg

English: 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.