Where do you check to verify if cardiologistor vascular sergon has large or extensive experience in robotic cardiac surgery.?

Websites nowdays: First to your states dept. Of professional regulation for license/disciplinary actions. Then to a health grading site called "healthgrades.Com" among others. Finally called the hospital to ask for outcome/rankings from surgery; they compare to other community hospitals.!

Checking experience: Your own doc may be a good source for that info. There are also lots of websites that report on docs like healthgrades etc.

Robotic surgery: Ask the surgeon how many robotic cases he/she has done and how his robotic complication rates compare to his/her non-robotic complication rates.