echocardiography: systolic flow velocity V1/V2 ratio of prosthetic pulmonary valve with stress
echocardiography: systolic flow velocity v1/v2 ratio of prosthetic pulmonary valve with stress
echocardiography: systolic flow velocity V1/V2 ratio of prosthetic pulmonary valve with stress (procedure)
echocardiography: systolic flow velocity v1/v2 ratio of prosthetic pulmonary valve with stress (procedure)