So very sorry to hear that but yet again was for the best I am sure. I never had to have cardiologist clearance prior to surgery. I did, however, need to have an EKG done with the other preop testing. Not sure of your age but I do know a lot of the preop testing used to be different depending on your age.
I am sure you are crushed but YOU ARE ALIVE! Good luck at the cardiologist and keep your chin up.