Provider facility background
Dennis M Cassidy, MD

Dennis M Cassidy, MD

Clinical Cardiac Electrophysiology
Dennis Cassidy, MD, FACC, FHRS 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.

Accepts most insurances. Please call the office to confirm your specific plan.


Ablation for Treatment of Cardiac Arrhythmias


Angina and Acute Coronary Syndrome

Ankle Disorders

Aortic Aneurysm

Aortic Dissection

Aortic Ectasia

Aortic Stenosis

Aortic Valve Disease

Aortic Valve Regurgitation


Atrial Fibrillation

Atrial Flutter

Atrioventricular Block

Automatic Implantable Cardioverter Defibrillator (ICD) Implantation

Autonomic Disorders

Cardiac Catheterization

Cardiac Catheterization (incl. Coronary Angiography)

Cardiac Electrophysiology

Cardiac Imaging




Cardiovascular Defibrillator Implantation and Follow Up

Cardiovascular Pacemaker Implantation and Follow Up


Cardioverter-Defibrillator or Pacemaker Insertion, Removal or Repair

Carotid Artery Disease

Chest CT (incl. Heart and Lungs)

Chest Pain

Chronic Pulmonary Heart Diseases (incl. Pulmonary Hypertension)

Complete Heart Block

Congenital Aortic Valve Disorders

Congenital Heart Defects

Congenital Heart Disease

Congestive Heart Failure

Coronary Angioplasty, Atherectomy and Stent

Coronary Artery Disease (CAD)

CT Imaging

Defibrillator Implantation


Electrocardiogram (EKG)

Electrophysiological Study


Emergency Cardioversion


Event Monitoring

Healthcare Exchange

Heart Attack (Acute Myocardial Infarction)

Heart Disease

Heart Disease Prevention

Heart Palpitations

Heart Surgery

Heart Tumors, Benign



Hypertensive Chronic Kidney Disease

Hypertensive Heart and Chronic Kidney Disease

Hypertensive Heart Disease


Insertion of Left Ventricular Lead for Pacemaker or Cardioverter and-or Defibril

Insertion of Left Ventricular Lead for Pacemaker or Cardioverter/ Defibrillator

Left Bundle Branch Block

Limb Swelling

Limb Swelling Caused by Fluid Overload

Long QT Syndrome



Mitral Valve Disease

Mitral Valve Regurgitation

Mitral Valve Stenosis

Mobitz, Type 2, Heart Block

Nuclear Cardiology

Pacemaker Insertion or Replacement

Peace of Mind

Pericardial Disease

Peripheral Artery Catheterization

Peripheral Vascular Disease - Vascular PVD

Preventive Medicine

Pulmonary Disease

Pulmonary Edema

Pulmonary Hypertension

Pulmonary Valve Disease

Removal or Revision of Pacemaker or Cardioverter and-or Defibrillator

Rheumatic Aortic Valve Disorders

Right Bundle Branch Block

Seasonal Resident

Septal Defect

Stress Test


Tetralogy of Fallot



Tilt Table

Tilt Table Testing