The Electrophysiology (EP) Lab in the Heart & Vascular Institute at Santa Rosa Memorial Hospital is one of the longest running and most highly experienced programs in Northern California for the evaluation and management of heart rhythm disturbances.

Our dedicated and highly trained EP team is committed to getting the heart rhythm - and the lives of our patients back to normal through comprehensive evaluation, treatment and follow-up care. We perform a range of specialized services, including electrophysiology studies, pacemaker and defibrillator implantations, and ablation procedures.

Since its 1991 inception as the first electrophysiology lab in the North Bay, the Santa Rosa Memorial Hospital EP Lab has been on the forefront of new procedures and technologies in heart rhythm management. Under the leadership of EP Lab Director Peter Chang-Sing, M.D., F.A.C.C. our program actively participates in clinical trials that often provide patients with early access to new treatment options.

Electrophysiology Studies (EPS)

Electrophysiology studies (EPS) are tests that help doctors understand the nature of arrhythmias (abnormal heart rhythms). The results assist our specialists and electrophysiologist determine the best treatment options available. Learn more about EPS from the American Heart Association.

MAZE for Atrial Fibrillation

Maze is an open heart procedure used to treat Atrial Fibrillation (A-Fib). During the procedure, a number of incisions are made on the left and right atrium of the heart to form scar tissue, which does not conduct electricity and disrupts the path of abnormal electrical impulses. The scar tissue also prevents erratic electrical signals from recurring.

Hybrid MAZE

The hybrid maze is a minimally invasive procedure for treatment of atrial fibrillation (A-Fib). It is performed in two stages, both of which create scar lines in specific places in and around the heart. These scars disrupt abnormal electrical signals that cause atrial fibrillation and redirect them, restoring your heart's rhythm and normal blood flow. The hybrid maze procedure does offer shorter recover times.

Loop Recorder

A loop recorder is a small device implanted under the skin to monitor arrhythmias via Bluetooth technology.

3-D Mapping

3-D Mapping is used to create a, much-improved, three-dimensional model of the heart, without X-rays. Catheters with small electromagnetic sensors in their tips allow the electrophysiologists to create and manipulate a computerized 3-D map of the patient's heartbeat. This gives the electrophysiologist the ability to track the electrical activity of the heart in real time.


Cryoablation is used to restore normal heart rhythm by disabling heart cells that create an irregular heartbeat. During this minimally invasive procedure, a thin flexible tube called a balloon catheter is used to locate and freeze the heart tissue that triggers an irregular heartbeat. This is used primarily for atrial fibrillation (a-fib).

Temporary & Permanent Devices

  • Temporary Pacemaker
  • Permanent Pacemaker
  • Implantable Cardioverter Defibrillator (ICD) - Also known as Cardiac Resynchronization Therapy, The EP Lab was one of the first 25 facilities in the U.S. to participate in clinical trials for Bi-ventricular ICDs. These devices are designed to treat patients with Congestive Heart Failure by re-synchronizing the heart’s pumping action. We are one of the nation’s most experienced EP facilities in the implantation of Biventricular ICDs.
  • Reveal LINQ - Insertable Cardiac Monitoring System revolutionizes cardiac monitoring and empowers impactful diagnostic and treatment solutions.
  • Micra® Transcatheter Pacing System (TPS)

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