echocardiography: calculated systolic peak flow gradient of Blalock-Taussig shunt
echocardiography: calculated systolic peak flow gradient of blalock-taussig shunt
echocardiography: calculated systolic peak flow gradient of Blalock-Taussig shunt (procedure)
echocardiography: calculated systolic peak flow gradient of blalock-taussig shunt (procedure)