Cardiology is a broad field and includes several subspecialties including adult cardiology, heart failure, interventional cardiology and electrophysiology. There are also cardiovascular pediatric/congenital and cardiothoracic surgery specialties.
Those who pursue cardiology as a specialty have opportunities in research and science, as well as working with patients in clinical settings. In fact, many physicians find themselves dedicating portions of their time to both academia and clinical work!
With the many career options, you can have a challenging career and fulfilling personal life. As your life changes, you can expand into different fields within cardiology that fit your changing lifestyle.