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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

Phone Number: 727-490-2100

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.



Languages Spoken




Cardiac Electrophysiology

Procedures & Conditions

Cardiac Electrophysiology, Cardiovascular Diseases

Medical Education & Training

Medical School: Memorial University of Newfoundland
Internship: Memorial University of Newfoundland
Residency: Queen's University; University of Toronto
Fellowship: University of Pennsylvania

Certifications & Memberships

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

Office Locations and Office Hours

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