Cardiac Electrophysiology

Wendy Tzou

Wendy Tzou, MD

Director, Cardiac Electrophysiology Program

The University of Colorado Cardiac Electrophysiology Section continues to undergo its expansion of faculty expertise, clinical services, research areas, educational programs, and facilities. The section is the largest group of its kind in the region taking on the most challenging cases with our faculty utilizing the latest advancements in the treatment of arrhythmia. As the only academic program in the region, we are training the next generation of physicians, moving medical science forward with groundbreaking research, and serving the Rocky Mountain community with patient and continuing medical education programs.

The section has relationships with other UC Health, Denver Health Medical Center and Denver Veterans Administration Medical Center, including cardiac surgeons, heart failure specialists, and medical geneticists, to offer the full complement of arrhythmia management services at University of Colorado. These services include a broad range of diagnostic and therapeutic procedures, inpatient and outpatient consultations, and specialized clinics for patients with arrhythmias, defibrillators or pacemakers. The University electrophysiology group also maintains clinical and academic relationships with hospitals throughout the region to add to its clinical, educational, and research programs.

The facilities at the Cardiac and Vascular Center at UCHealth Hospital are second to none. There are four suites exclusively dedicated to electrophysiology, including those fitted with biplane fluoroscopic imaging, intracardiac echocardiography, cryoablation, electroanatomical mapping, stereotaxis magnetic navigation, laser technology, and advanced signal processing equipment to assist in the full complement of catheter and device based therapies. Similar state-of-the-art facilities have be constructed at Denver Health Medical Center and the Denver Veterans Administration Medical Center as part of the integrated cardiac electrophysiology program.
  • Advanced Atrial Fibrillation Therapies
  • Autonomic Nervous System Dysfunction
  • Implanted Cardiac Devices for Management of Heart Failure & Arrhythmias
  • Left Atrial Appendage Closure
  • Complex Ventricular Arrhythmias
  • Implanted Lead Extraction
  • Robotic/Magnetic Navigation
  • Personalized Medicine
  • Cardiac Sarcoidosis Clinic


For more information regarding the clinic, please contact our patient access representatives at 720-848-6510 and you will be directed toward the appropriate faculty member.


An active cardiac electrophysiology research program is in place to evaluate all aspects of arrhythmia management. Researchers at the University of Colorado have contributed significantly to the advancement of the field with investigations evaluating new  implantable devices for management of congestive heart failure and prevention of sudden cardiac death, as well as catheter ablation of arrhythmias. The University of Colorado's research program in arrhythmias related to sarcoidosis is internationally recognized as pioneering. The hallmark of arrhythmia research at University of Colorado is a high level of collaboration with with overlapping interests. These investigators include other Colorado-based researchers involved in other areas of medicine as well as those electrophysiologists based at other institutions where effective collaboration is critical for investigating rare arrhythmogenic diseases.

Every aspect of arrhythmias research is explored in our section from basic cellular mechanisms and pre-clinical translational work to multi-center observational studies and outcomes research affecting clinical practice, protocols and policies. University of Colorado researchers are frequently cited in peer-reviewed literature in all of these areas. 


The cardiac electrophysiology section maintains an active ACGME accredited fellowship with a focus on training physicians in understanding basic electrophysiologic principles and techniques for ablation of complex arrhythmias applied to arrhythmia management. Two cardiology fellows per year are invited to participate in this training program with an emphasis on establishing a career in academic medicine. Cardiac Electrophysiology fellows are given the opportunity to participate in all aspects of the training program including device implantation and management, cardiac ablation, and arrhythmia research. In addition to the fellowship, the cardiac electrophysiology section participates in the teaching and training of medical students, internal medicine residents, and cardiology fellows. 

A continuing medical education program is held annually in Boulder where renowned faculty provide updates in research and best practices for the treatment of atrial fibrillation and ventricular arrhythmias.

Patient educational symposia occur frequently throughout the year with the establishment of support groups and an annual symposium focused on atrial fibrilation.

Meet our Team

Lohit Garg



Lohit Garg, MBBS 

Assistant Professor, Medicine-Cardiology




Matthew Zipse, MD 

Associate Professor, Medicine-Cardiology




Alexis Tumolo, MD 

Associate Program Director, Fellowship in Cardiac Electrophysiology



Paul Varosy, MD 

Director of Cardiac Electrophysiology,

VA Eastern Colorado Health Care System




Amneet Sandhu, MD

Assistant Professor, Medicine-Cardiology






Michael Rosenberg, MD 

Associate Professor, Medicine-Cardiology


Get with the Guidelines -- Afib Silver


The American Heart Association and American Stroke Association have recognized UCHealth University of Colorado Hospital for its continued success in using the Get With the Guidelines – AFIB program and applying the most up-to-date, evidence-based treatment guidelines to improve patient care and outcomes.


Silver EP
To make an appointment with a Cardiologist:

Contact the Heart Center
Phone: (720) 848-5300


Physician Profiles can be found at CU Doctors.


Referring Physicians:

If you are a referring physician, call the 24 hour

UCHealth Docline: 1-844-285-4555


EP Office
Phone: (720) 848-6510

Cardiology (SOM)

CU Anschutz

Anschutz Inpatient Pavilion 1

12605 East 16th Avenue

3rd Floor

Aurora, CO 80045


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