Tomos Walters, PhD, MD

Cardiologist and electrophysiologist

Dr. Tomos Walters is a cardiologist who specializes in the heart's electrical system, or cardiac electrophysiology. He cares for adults with rhythm disorders that may arise from any chamber of the heart and cause fast, slow or irregular heartbeats. He seeks to individualize care and to establish clear and open communication with his patients.

Walters has extensive training in catheter ablation, a minimally invasive procedure that can restore a regular heartbeat by destroying a small area of malfunctioning heart tissue. He also specializes in implanting and managing cardiac rhythm devices. These range from standard pacemakers to advanced implantable devices that monitor electrical activity, defibrillate the heart if a life-threatening arrhythmia occurs or improve pumping efficiency in patients with heart failure.

Walters' research investigates the causes of persistent atrial fibrillation &nash; characterized by irregular or rapid heartbeats – as well as the factors that worsen symptoms and affect quality of life for patients with the condition. He also studies factors that lead to heart failure in patients with ventricular premature beats, or extra heartbeats that originate in the lower chambers.

Walters earned his medical degree as well as a doctorate from the University of Melbourne. He then completed a fellowship in electrophysiology at Royal Melbourne Hospital, where he studied under Jonathan Kalman, one of the leading electrophysiologists in Australia. He also completed a fellowship in electrophysiology at UCSF. He belongs to the American Heart Association, Royal Australasian College of Physicians and Cardiac Society of Australia and New Zealand.


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.

More about Tomos Walters


University of Melbourne, MD, PhD 2003


Royal Melbourne Hospital, Electrophysiology 2015
UCSF, Electrophysiology 2017

Selected Research and Publications

  1. Stacy R, Huttner K, Watts J, Peace J, Wirta D, Walters T, Sall K, Seaman J, Ni X, Prasanna G, Mogi M, Adams C, Yan JH, Wald M, He Y, Newton R, Kolega R, Grosskreutz C. A randomized, controlled phase I/II study to evaluate the safety and efficacy of MGV354 for ocular hypertension or glaucoma. Am J Ophthalmol. 2018 May 23.
  2. McLellan AJA, Prabhu S, Voskoboinik A, Wong MCG, Walters TE, Pathik B, Morris GM, Nisbet A, Lee G, Morton JB, Kalman JM, Kistler PM. Isolation of the posterior left atrium for patients with persistent atrial fibrillation: routine adenosine challenge for dormant posterior left atrial conduction improves long-term outcome. Europace. 2017 Dec 01; 19(12):1958-1966.
  3. Pathik B, Kalman JM, Walters T, Kuklik P, Zhao J, Madry A, Sanders P, Kistler PM, Lee G. Absence of rotational activity detected using 2-dimensional phase mapping in the corresponding 3-dimensional phase maps in human persistent atrial fibrillation. Heart Rhythm. 2018 Feb; 15(2):182-192.

Publications are derived from MEDLINE/PubMed and provided by UCSF Profiles, a service of the Clinical & Translational Science Institute (CTSI) at UCSF. Researchers can make corrections and additions to their publications by logging on to UCSF Profiles.