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Meet Your Valve Disease Team

Adventist Health St. Helena is well-known as one of the region’s most active and historic innovators in cardiac care, and the Valve Clinic continues that tradition by bringing together the most advanced technology and some of the most recognized providers in the field into a single resource. The Valve Clinic’s greatest strength isn’t in its cutting-edge technology, however, but instead rests in the hands of its team of talented, accomplished, and dedicated surgeons, cardiologists, and specialist providers, working with nurses and technicians who are experienced specialists in cardiovascular care. Together, they offer a full spectrum of adult, pediatric, and geriatric cardiac care, with special emphasis on non-invasive and minimally-invasive techniques. And according to their patients, they combine this mastery of cutting edge medicine with extraordinary personal warmth and compassion. Meet the physicians of our Valve Team:

Stewart Allen

Stewart Allen, MD, FACC

General & Interventional Cardiologist

Medical Director of Cardiology for the Adventist Heart Institute, Dr. Allen is a board certified interventional cardiologist who is highly skilled in interventions, including transcatheter aortic valve replacement (TAVR). He earned his medical degree from Wake Forest University School of Medicine. He completed his internship and residency in internal medicine at Medical University of South Carolina and continued his medical training at Thomas Jefferson University. Dr. Allen went on complete fellowship programs in clinical cardiology, cardiovascular research and interventional cardiology. He is board certified in Internal Medicine, Cardiovascular Disease, and Interventional Cardiology.

In addition to practicing as an interventional cardiologist, Dr. Allen has a strong interest in a patient specific, preventative approach. Dr. Allen, who lectures on preventive health and risk factor modification, has been a spotlight speaker on prevention for the American Heart Association, and has been designated as a specialist in clinical hypertension by the American Society of Hypertension.

Monica S. Divakaruni

Monica S. Divakaruni, MD

General & Interventional Cardiologist

Dr. Divakaruni is a board certified cardiologist with vast experience in interventional cardiology, specializing in the most advanced cardiac catheterization techniques available including transcatheter aortic valve replacement (TAVR). She earned her medical degree from University of California San Francisco School of Medicine followed by an internship and residency at Stanford University Hospital. Dr. Divakaruni went on to complete fellowships in cardiovascular disease and interventional cardiology at Stanford University Hospital. She is board certified in Internal Medicine, Cardiovascular Disease, and Interventional Cardiology.

With a history of bringing outreach care to underserved groups at home and abroad, Dr. Divakaruni is a passionate advocate for women’s heart health, across the full spectrum of cardiac care. She places special focus on innovative treatment options, and keeps at the forefront of new diagnostic testing and the most advanced cardiac catheterization techniques available. She is the founder and Medical Director of St. Helena Women’s Heart Center.

Gan H. Dunnington

Gan Dunnington, MD

Cardiothoracic Surgeon

Dr. Dunnington is a board certified cardiothoracic surgeon, specializing in minimally invasive complex cardiac procedures such as the hybrid maze, transcatheter aortic valve replacement, mitral valve repair and replacements as well as VATS lobectomy for the treatment of lung cancer. Dr. Dunnington received his medical degree from Medical College of Virginia and completed his residency at Stanford University, becoming Chief Resident of Surgery. Having received a fellowship in cardiothoracic surgery at the University of Virginia, he went on to become an assistant professor at Stanford University School of Medicine, and assistant director of cardiothoracic surgery at El Camino Hospital, a Stanford University affiliate.

Dr. Dunnington has been a leader in cardiothoracic surgery for most of his career. He is currently one of only a handful of surgeons qualified to perform the revolutionary Hybrid Maze procedure for treating A-Fib, and is internationally recognized for his work.

Andreas Sakopoulos

Andreas Sakopoulos, MD, FACS

Cardiothoracic & Vascular Surgeon

Dr. Andreas Sakopoulos is a board certified cardiothoracic surgeon specializing in minimal access valve replacements, including transcatheter aortic valve replacement and endovascular treatment of thoracic and abdominal aortic aneurysms. He is a graduate from the University of Pisa, School of Medicine and Surgery and completed his cardiovascular and thoracic training at Loma Linda University and the University of Toronto.

An accomplished and respected surgeon, Dr. Sakopoulos is also a specialist in treating lung cancer and other chest tumors. He is a recognized leader in the advancement of cutting-edge cardiovascular surgical interventions.

Valve Clinic Coordinator

The Valve Clinic Coordinator brings exceptional skills and vast experience in patient care and clinic coordination. They serve as the primary liaison between our team and you. They're instrumental in educating patients and coordinating appointments and communication between providers.

Getting Started

To learn more about what we can do for you, or to refer a patient, please contact our valve coordinator:

Phone: 707.963.6322
Fax: 707.963.7203
Email: valve@ah.org

Start living. Heart healthy.

Request More Information

Call 888.529.9018 to speak with a Patient Service Advisor, or fill out the form and we’ll contact you soon.

The Adventist Heart Institute values your privacy and handles your personal information with care. Your email address and information is secure, confidential and will not be sold to any third party sources.

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To talk with someone immediately, call 888.529.9018

The Adventist Heart Institute values your privacy and handles your personal information with care. Your email address and information is secure, confidential and will not be sold to any third party sources.

AHI Rebrand