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St. Petersburg General Hospital

Dennis Cassidy, MD

Cardiac Electrophysiology

The Heart Institute

6006 49th St N, Suite 200
St. Petersburg, FL 33709

About Dennis Cassidy

Dr. Cassidy received his medical degree and completed his internship at Memorial University in St. Johns, Newfoundland, Canada. He completed his internal medicine training at the University of Toronto, Toronto, Ontario, Canada and his cardiology residency at Queen’s University in Kingston, Ontario, Canada. He then specialized in clinical cardiac electrophysiology at the Hospital of the University of Pennsylvania in Philadelphia, Pennsylvania.

Dr. Cassidy is board certified in Internal Medicine, Cardiology, and Clinical Cardiac Electrophysiology. He specializes in the field of cardiac electrophysiology, which deals with disorders of the electrical system of the heart. He has expert training in the area of implantation and management of pacemakers, cardiac defibrillators, electrophysiology, and catheter ablation procedures. He is a member of the American Heart Association and a Fellow of the American College of Cardiology and Heart Rhythm Society.


Medical School
Memorial University of Newfoundland

Memorial University of Newfoundland

Queen's University; University of Toronto

University of Pennsylvania

Certifications & Memberships

American Board of Internal Medicine (Clinical Cardiac Electrophysiology); American Board of Internal Medicine (Sub: Cardiovascular Disease)



Languages Spoken


Procedures & Conditions

Cardiac Electrophysiology, Cardiovascular Diseases


Cardiac Electrophysiology

Office Locations

The Heart Institute
6006 49th St N
Suite 200
St. Petersburg, FL 33709
Phone: 727-490-2100

Office Hours

Monday - Friday, 9:00am - 5:00pm

Accepted Insurance

•Humana •AvMed •Aetna •Health Options •HIP •Cigna •WellCare •Medicaid •United Health Care