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Complex Arrhythmia Center

The Complex Arrhythmia Center at Memorial Hermann Heart & Vascular Institute-Texas Medical Center provides the advanced management and treatment of heart rhythm abnormalities, or arrhythmias including atrial fibrillation which is the most common type of arrhythmia.


The Center provides access to a highly skilled and experienced team specializing in:

  • Cardiac VT ablations (a procedure that eliminates the tissue in the heart causing the abnormal heartbeat)
  • Lead extractions
  • Cardiac resynchronization therapy (CRT)
  • Implantation of other rhythmic management devices such as a pacemaker,implantable cardioverter-defibrillator (ICD) or biventricular ICD

Number of Cases

Each year, the affiliated physicians at the Complex Arrhythmia Center perform over 250 atrial fibrillation ablations, 1,400 complex procedures, 700 device implantations, 700 ablations and 50 ventricular tachycardia ablations.

Continuum of Care

The cohesive and collaborative nature of our affiliated specialists and nurses allows the Center to provide patients a seamless continuum of care from initial evaluation through discharge, which is unique to arrhythmia treatment in the Gulf Coast region.

Physicians & Staff

Dr. Ramesh Hariharan MD

Dr. Ramesh Hariharan

Ramesh Hariharan, M.D., is the medical director of the Complex Arrhythmia Center. He is board certified in cardiac electrophysiology, cardiology and internal medicine. Dr. Hariharan has an array of clinical and research interests which range from device management of congestive heart failure to the ablation of atrial and ventricular arrhythmias. He has performed numerous complex and sophisticated catheter ablation procedures for the treatment of life-threatening arrhythmias in patients with cardiomyopathy.

Dr. Hematpour

Dr. Khashayar Hematpour

Khashayar Hematpour, M.D., is board certified in Internal Medicine, Cardiology, Echocardiography, Nuclear Cardiology, and Cardiac Electrophysiology. His clinical and research interests are in cardiac resynchronization, atrial fibrillation, ventricular arrhythmias, and left atrial appendage closure devices. Dr. Hematpour is the author of several manuscripts and book chapters in clinical cardiology. He finished his training in Internal Medicine at St Luke’s Roosevelt Hospital of Columbia University.  After finishing his cardiology training at University of Texas Medical Branch, Dr. Hematpour did his cardiac electrophysiology fellowship at Boston Medical Center of Boston University.
Dr. Saumya Sharma MD

Dr. Saumya Sharma

Saumya Sharma, M.D., is board certified in cardiac electrophysiology, cardiology and internal medicine. He has done extensive research in congestive heart failure and received several honors, including the prestigious American College of Cardiology Young Investigator Award. Dr. Sharma’s clinical and research interests focus on device management for congestive heart failure and catheter ablation of atrial fibrillation.

Appointments and More Information

For more information on our services for patients with arrhythmia and atrial fibrillation, or for a referral to an affiliated physician, call (713) 704-2221.

Complex Arrhythmia Center

Memorial Hermann Heart & Vascular Institute-Texas Medical Center
Memorial Hermann Medical Plaza
6400 Fannin, Suite 2500
Houston, TX 77030