TRANS-SEPTAL CATHETERIZATION AND SELECTIVE ANGIOCARDIOGRAPHY BY RETROGRADE ARTERIAL ROUTE IN THE DIAGNOSIS OF MITRAL VALVULOPATHY
EL CATETERISMO TRANSEPTAL Y LA ANGIOCARDIOGRAF'IA SELECTIVA POR V'IA ARTERIAL RETR'OGRADA EN EL DIAGN'OSTICO DE LA VALVULOPAT'IA MITRAL