Electrophysiology & Arrhythmia Service

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The UCSF Cardiac Electrophysiology and Arrhythmia Service is known worldwide for the evaluation and treatment of patients with a variety of cardiac arrhythmias, or abnormal heart rhythms. Electrophysiology, a subspecialty of cardiology, is a rapidly growing field on the forefront of discovering cures and new treatments for all forms of arrhythmias.

Over the past two decades, tremendous advances have been made in understanding the mechanisms of cardiac arrhythmias. The Electrophysiology Service has a history of innovation and is a leader in advancing the assessment of the heart's electrical functions. In the 1980s, doctors at UCSF Medical Center pioneered the use of catheter ablation, a treatment that destroys or disrupts parts of the electrical pathways causing arrhythmias. Today, we use this technique to successfully treat a variety of cardiac arrhythmias.

Our team of experienced electrophysiologists, nurses and technicians is devoted to the care of patients with abnormal heartbeats. We perform over 900 procedures a year, including 400 catheter ablation procedures. This high volume ensures efficiency and expertise in the treatment of arrhythmias.

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Cardiac Electrophysiology and Arrhythmia Service maintains a vigorous research program. The service develops and participates in clinical trials, research studies involving experimental therapies, with the National Institutes of Health (NIH) and the Food and Drug Administration (FDA) as well as pharmaceutical and device companies to discover better treatments. These trials give patients access to many new investigative therapies, devices and medications that may be more effective than traditional treatment methods. In turn, this research and the development of new technologies and treatments allow the Electrophysiology Service to provide specialized and personalized care for our patients.

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You'll need a referral from your primary care provider or specialist to make an appointment. Once you have the referral, please call the number below.

Getting Here

Cardiac Electrophysiology and Arrhythmia Service
400 Parnassus Ave., Fifth Floor
San Francisco, CA 94143
Phone: (415) 353-2554
Fax: (415) 353-2528

Hours: Monday to Friday
8 a.m. – 5 p.m.

What to Bring

    Proof of authorization from insurance provider, if applicable

Access Your Health Information Online

This clinic uses UCSF MyChart, an online patient service. Message your provider, request medication refills, view some test results and more.

Learn more about UCSF MyChart

Research and Clinical Trials


Parking at Parnassus

Public parking for an hourly fee at UCSF Medical Center is available in the seven-level Millberry Union Garage at 500 Parnassus Ave. There are two garage entrances — one on the north side of Parnassus Avenue and another on Irving Street, just east of Third Avenue.

Another garage with an hourly fee, at 350 Parnassus Ave., is open Monday to Friday from 6 a.m. to 10 p.m.

Metered street parking is rarely available.

Patients being admitted to the hospital may be dropped off at the circular driveway leading to the main entrance at 505 Parnassus Ave. This area also may be used to pick up patients who are being discharged.

For more information about parking at Parnassus, call Campus Parking Services at 476-2566.

Valet Parking Service

Valet parking service is available at the Ambulatory Care Center (ACC) at 400 Parnassus Ave. from 8 a.m. to 3 p.m. The valet service is free but patients must pay regular parking fees. For more information about the valet service, call (415) 476-6200.

A UCSF "greeter" also is available at the ACC from 8 a.m. to 5 p.m. to assist patients find their way.

Public Transportation


UCSF Medical Center is accessible via Muni streetcar line N-Judah*, which stops at Second Avenue and Irving Street, and the following Muni bus lines, which stop in front of the hospital:

  • 43-Masonic*
  • 6-Parnassus

For more information about Muni visit, www.sfmuni.com.

* Wheelchair accessible bus routes

Related Information

Ways to Give

Our Team

Edward Gerstenfeld
Edward Gerstenfeld, MD
Cardiologist and electrophysiologist
Henry Hsia
Henry Hsia, MD
Cardiologist and electrophysiologist
Byron K. Lee
Byron K. Lee, MD
Cardiologist and electrophysiologist
Randall Lee
Randall Lee, PhD, MD
Cardiologist and electrophysiologist
Gregory Marcus
Gregory Marcus, MD
Cardiologist and electrophysiologist
Joshua Moss
Joshua Moss, MD
Cardiologist and electrophysiologist
Jeffrey Olgin
Jeffrey Olgin, MD
Cardiologist and electrophysiologist
Melvin Scheinman
Melvin Scheinman, MD
Cardiologist and electrophysiologist
Zian Tseng
Zian Tseng, MD
Cardiologist and electrophysiologist
Vasanth Vedantham
Vasanth Vedantham, MD, PhD
Cardiologist and electrophysiologist
Tomos Walters
Tomos Walters, PhD, MD
Cardiologist and electrophysiologist