Blown Wide Open: An Unusual Case of Torrential Mitral Regurgitation Resolving With a Cough

Mitral regurgitation can have varying hemodynamic parameters dependent on factors such as pressure gradients, exercise, and/or provocative maneuvers. We present a case of unusual dynamic mitral regurgitation resolved by coughing in a patient with hypertrophic cardiomyopathy. (Level of Difficulty: Intermediate.).