Arrhythmia Service (Electrophysiology)

Dr.George Thomas

Arrhythmia and Electrophysiology

Arrhythmia is an irregular or improper beating of the heart. Our team specializes in diagnosing and treating this condition using the most advanced equipment and techniques. With early detection and diagnosis, arrhythmias can be successfully treated. The goal of treatment is to relieve uncomfortable symptoms and prevent severe complications. 

Since the Cardiac Electrophysiology Laboratory at Weill Cornell Medical Center first opened its doors in 1987, it has grown into one of the busiest and most experienced laboratories in the country. Our electrophysiologists have been recognized nationally as leaders in the field through engagement in important research.


Electrophysiology Expertise at Weill Cornell Medicine 

Electrophysiology (EP) studies are used to diagnose arrhythmias. During this procedure, catheters (wires) are placed in the heart with X-ray guidance. The heart rhythm is then carefully studied and, if necessary, treated with ablation. Learn more about EP procedure

Your cardiologist will discuss the diagnosis procedure and all treatments available with you to determine the best option for you. 

If you are at risk for arrhythmias (for example, if you have advanced heart disease or coronary artery disease), you may benefit from implantation of electronic devices (implantable cardioverter-defibrillator, cardiac resynchronization devices and pacemakers) into the body to improve the function of the heart and protect against sudden cardiac problems (including death).

The Arrhythmia Service provides: 

  • Diagnostic cardiac electrophysiology studies
  • Catheter ablation of arrhythmias (including atrial fibrillation, ventricular tachycardia, premature ventricular contractions and supraventricular tachycardia)
  • Pacemaker implantation
  • Implantable cardioverter-defibrillator implantation (ICD)
  • Cardiac resynchronization therapy (bi-ventricular pacing)
  • Pacemaker and ICD lead removal
  • Insertable loop recorder (ILR) implantation
  • Electrical cardioversion
  • Tilt table testing
  • Left atrial appendage occlusion and ligation (for stroke prevention in atrial fibrillation patients)
  • Pacemaker and ICD follow-up clinic
  • Office consultation for evaluation and management of arrhythmias
  • Access to research protocols for innovative treatment of heart rhythm disorders

Information for New Patients 

To help you and your physician prepare for your visit, please provide the following before scheduling your appointment:

  • Copies of cardiac-related medical records such as EKGs, Holter or event monitor reports, echocardiograms, stress test, catheterization reports, any MRI or CT scan reports and imaging discs, and any previously performed electrophysiologic procedures. You may also sign this Medical Records Release Form.pdf,and our office will request the records directly.
  • Completed New Patient Questionnaire.pdf

Our Physicians

Faculty Title Phone
Headshot of Steven Markowitz
Steven M. Markowitz, M.D.
Professor of Medicine, Director Cardiac Electrophysiology Laboratories 646-962-3421
Jim W. Cheung, M.D.
Jim Cheung, M.D.
Professor of Medicine, Director Cardiac Electrophysiology Fellowship Program, Director Clinical Electrophysiology Research 646-962-3421
Headshot of James Ip
James Ip, M.D.
Professor of Clinical Medicine 646-962-3421
Christopher Liu
Christopher F. Liu, M.D.
Associate Professor of Medicine, Medical Director Electrophysiology Services NYP Weill Cornell Sphere 646-962-3421
Headshot of George Thomas
George Thomas, M.D.
Assistant Professor of Medicine, Director Lead and Device Extraction 646-962-3421

Make an Appointment

(646) 962-3421

Weill Cornell Medical College
Division of Cardiology
520 East 70th Street
Starr 443
New York, NY 10021