echocardiography: calculated systolic mean flow gradient of left ventricular outflow tract after amyl nitrite
echocardiography: calculated systolic mean flow gradient of left ventricular outflow tract after amyl nitrite
echocardiography: calculated systolic mean flow gradient of left ventricular outflow tract after amyl nitrite (procedure)
echocardiography: calculated systolic mean flow gradient of left ventricular outflow tract after amyl nitrite (procedure)