Contact Memorial Cardiac and Vascular Institute This contact page is not intended for any emergency purpose. If you are in need of emergency assistance, please call 911. Please be aware that Memorial Cardiac and Vascular Institute cannot provide any emergency assistance or medical diagnosis via this online contact. We review and respond to questions and comments during regular business hours, Monday through Friday (with the exception of holidays). Messages sent to this site may be unread for extended periods of time. To speak to a Memorial Cardiac and Vascular Institute operator, please call 855-400-6284.