Left ventricular outflow tract obstruction provoked during dobutamine stress echocardiography predicts future chest pain, syncope, and near syncope

This is the first prospective study to identify the differential prognostic implications of the site of dynamic obstruction noted during DSE. Our results demonstrate that DSE-provoked LVOT obstruction is an independent positive predictor of future episodes of chest pain and syncope and/or near syncope. These findings warrant larger studies addressing treatment options to ameliorate symptoms in this subgroup of patients.