Hello,

You can pursue an MD after earning a B.Sc. in cardiology.

The Bachelor of Science in Cardiology or Cardiac Technology prepares you for entry-level technician positions in the medical industry, but if you want to become a doctor, you must continue your education by earning an MSc and eventually an MD in Cardiology. A higher-level degree, such as an MD with a specialty in cardiology or an MSc in cardiology combined with a master's degree, is required to become a cardiologist.

Here is a link to the article which might be helpful if you wish to know more about Cardiology -

https://www.careers360.com/courses/cardiology-and-thoracic-science-course