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Gaurav Banka, MD, is a board-certified cardiologist with a wide range of experience in both cardiology and internal medicine. Dr. Banka is proud to bring integrative care to the communities of Los Angeles at COR Healthcare Medical Associates in Torrance and Redondo Beach, California.

A longtime academic, Dr. Banka graduated with honors in biology and health policy from Harvard University. Before attending Stanford University School of Medicine, he spent a year building the Indian government's healthcare system with the Clinton Foundation. He later completed his internal medicine residency and cardiology fellowship at the University of California, Los Angeles (UCLA) Ronald Reagan Medical Center. Dr. Banka is trained in all aspects of cardiology but specializes in cardiac imaging. He’s currently Director of Echo at Torrance Memorial Medical Center and part of the Department of Radiology, where he interprets cardiac CTs. He is board certified in internal medicine, cardiology, echo, CT, nuclear medicine, and certified in cardiac MRI. He has served on national guideline committees for cardiac care and has published over 20 research publications and presentations at international medical conferences.

With more than eight years of experience, Dr. Banka performs several services at COR Healthcare Medical Associates, including heart disease management, heart attack treatment, valvular disease, congestive heart failure, preventative cardiac care, and treatment for hypertension (high blood pressure) and high cholesterol.

When he isn’t working with patients, Dr. Banka loves playing saxophone and guitar and spending time with his wife and daughter.

James Matchison, MD, is an experienced physician at COR Healthcare Medical Associates who holds board certifications in internal medicine, interventional cardiology, adult cardiovascular disease, and adult comprehensive echocardiography. With a broad range of experience, Dr. Matchison is proud to serve the communities of Torrance and Redondo Beach, California.

Dr. Matchison earned his undergraduate degree from the University of Arizona in Tucson, before attending Ohio State University College of Medicine and Public Health in his hometown of Columbus, Ohio. He later completed his residency at Harbor-UCLA Medical Center in Torrance, California, and a general cardiology and interventional cardiology fellowship at Kaiser Permanente Los Angeles Medical Center in Los Angeles.

As an experienced cardiologist, Dr. Matchison specializes in the management of advanced cardiac disease, cardiac catheterization, coronary stent placement,  echocardiography, transcatheter aortic valve replacement (TAVR), and stress echocardiography.

He stays up-to-date with the latest treatments and is a member of the American Society of Cardiology and American Society of Echocardiography. Dr. Matchison has practiced in the South Bay area since 2012. Outside of work, he enjoys spending time with his family outdoors and exercising.

Eric Castleman, MD, is a board-certified cardiologist and internist at COR Healthcare Medical Associates in Los Angeles. He currently sees patients at the practice’s locations in Torrance and Redondo Beach, California, where he brings more than 35 years of experience specializing in general cardiology, and adult congenital heart disease.

Dr. Castleman earned his medical degree at Mount Sinai School of Medicine in New York City before moving to California for his medical training. He completed his internal medicine residency at the University of California, Los Angeles (UCLA) Medical Center and a cardiology fellowship from UC Irvine Medical Center in Orange, California.

Dr. Castleman has many interests outside of work. He loves spending time with his wife, who is a nurse, and their four children. He loves gardening, traveling, and tinkering in the garage repairing things.

Salman Azam, MD, is a board-certified internist and cardiologist at COR Healthcare Medical Associates in Los Angeles. He currently sees patients at the Torrance and Redondo Beach, California, offices, where he specializes in structural heart disease and interventional cardiology diagnosis and treatment for patients of all ages.

Dr. Azam earned his medical degree from Wayne State University School of Medicine in Detroit, Michigan. After earning his medical degree, he moved to Colorado to complete an advanced interventional cardiology fellowship at the University of Colorado in Denver, and the Swedish Medical Center in Seattle, WA. 

To ensure he stays up-to-date with the latest advances in treatments, Dr. Azam is board-certified in internal medicine, cardiovascular disease, and interventional cardiology. For the convenience of his patients, Dr. Azam speaks Hindi and English.

When not treating patients at COR Healthcare Medical Associates, Dr. Azam enjoys spending time with his wife and young children, playing sports, and going to the beach.

Wilson Kwan, MD, MS, is a board-certified internist and cardiologist at COR Healthcare Medical Associates. He specializes in general cardiology and advanced imaging. 

Dr. Kwan earned his medical doctorate at the Keck School of Medicine of USC. He completed his internal medicine residency and cardiovascular disease fellowship at LAC+USC Medical Center / Keck Hospital of USC. 

He has been certified by the American Board of Internal Medicine and Cardiovascular Disease in addition to subspecialty boards of Echocardiography, Cardiovascular CT, Nuclear Cardiology, and Vascular Interpretation. Dr. Kwan has authored multiple peer-reviewed publications in medical and basic science journals as well as contributed to several book chapters. 

Dr. Kwan is fluent in English and Mandarin and proficient in conversational Spanish. 

A SoCal native, Dr. Kwan enjoys fishing, freediving, tennis, basketball, and gardening. He is also an avid traveler and aspiring home chef. 

Dr. Sarsam received his medical education at the University of Baghdad / College of Medicine in Iraq. Following the second Gulf War, he moved to the United States and attended the Wayne State University / Detroit Medical Center where he completed his Internal Medicine Residency. He then completed his fellowship in General and Interventional Cardiology at Michigan State University / Providence Providence-Park Hospitals in Detroit, MI. Dr. Sarsam also specializes in advanced heart failure.

Dr. Shin is board certified in cardiovascular disease, interventional cardiology and internal medicine. She received her undergraduate degree from Brown University in Providence, Rhode Island and she attended medical school at the University of Cincinnati College of Medicine in Cincinnati, Ohio. Dr. Shin completed her residency at the UCLA San Fernando Valley program, where she was chief resident, and her fellowships at Harbor UCLA Medical Center in Torrance, California and Good Samaritan Hospital in Los Angeles, California.

Dr. Shin specializes in interventional cardiology, management of advanced cardiac disease, cardiac catheterization, coronary stent placement, peripheral arterial disease and intervention, echocardiography, stress echocardiography and pacemakers.

She sits on numerous committees and is the Cardiology Subcommittee Chair for Torrance Memorial Medical Center. 

She has received multiple honors and awards including the Society of Geriatric Cardiology Research Award; the Preventative Cardiology Award Program Grant; and the American Heart Association Fellowship Research Grant. Dr. Shin has been practicing in the South Bay for over 10 years. She is fluent in English and Korean.

As a triple diplomate with the American Board, Erol Kosar, MD, holds board certifications in clinical cardiac electrophysiology, cardiovascular diseases, and internal medicine. At COR Healthcare Medical Associates in Los Angeles, Dr. Kosar proudly brings his 30 years of experience to patients of all ages at the practice’s location in Torrance, California.

He is also certified by the International Board of Heart Rhythm Examiners (IBHRE). 

After earning his medical doctorate at Sidney Kimmel Medical College, Thomas Jefferson University, in Philadelphia in 1989, Dr. Kosar completed an internal medicine internship and residency at the University of Pittsburgh in 1992. He later received additional training through a cardiology and electrophysiology fellowship at the University of Southern California (USC) in Los Angeles. After completing his fellowship, Dr. Kosar served as a full-time assistant professor of medicine at USC.

Continuing education is a top priority for Dr. Kosar, who is a Western regional trainer for excimer laser lead extraction — developed by Spectranetics® — which uses laser technology to remove permanent pacemaker lead.

Dr. Kosar is highly trained in all aspects of cardiology and cardiac electrophysiology, but his special research interests include cardiac resynchronization, sudden cardiac arrest, lead extraction, and atrial fibrillation.

As a leader in his field, Dr. Kosar has authored numerous publications in Circulation, Journal of the American College of Cardiology, and Cardiac Electrophysiology Review.

Not only does Dr. Kosar work with patients at COR Healthcare Medical Associates in San Pedro, CA, but he is also on staff at Providence Little Company of Mary Medical Center in Torrance, and Torrance Memorial Medical Center

A triple diplomate of the American Board of Internal Medicine, Matthew Ostrom, MD, is board-certified in clinical cardiac electrophysiology, cardiovascular disease, nuclear cardiology, and internal medicine. Dr. Ostrom, who has more than 15 years of experience, serves the Los Angeles communities of Torrance and Redondo Beach, California, at COR Healthcare Medical Associates.

Born and raised in Seattle, Dr. Ostrom received his Bachelor of Science in microbiology from the University of Washington in 1999. Throughout his undergraduate studies, Dr. Ostrom was actively involved in cardiovascular research at the university and at the local biotechnology company ZymoGenetics, Inc.

Shortly after graduating, Dr. Ostrom began his medical studies at Loyola University Chicago Stritch School of Medicine. He completed an internal medicine internship and residency through the University of California, Los Angeles (UCLA) system. In addition, Dr. Ostrom pursued cardiology and electrophysiology fellowships at Harbor-UCLA Medical Center in West Carson, California, and at Kaiser Permanente Los Angeles Medical Center in Los Angeles. He is a fellow of the American College of Cardiology and the Heart Rhythm Society. 

Today, Dr. Ostrom is a practicing electrophysiologist, specializing in catheter and device-based therapies in the treatment of complex arrhythmias, syncope, sudden cardiac death, and heart failure.

His research interests include the ablation of complex arrhythmias and device-based treatments for sudden cardiac death and congestive heart failure. Dr. Ostrom has authored or co-authored numerous articles in peer-reviewed cardiology and electrophysiology journals.

In addition to his work at COR Healthcare Medical Associates, Dr. Ostrom is on staff at Providence Little Company of Mary Medical Center and Torrance Memorial Medical Center.

Away from work, Dr. Ostrom loves spending time outdoors with his wife and children.

Ray Wyman, MD, is a board-certified cardiologist specializing in general cardiology, internal medicine, interventional cardiology, and adult congenital heart disease. An experienced cardiologist with more than 20 years in his field, Dr. Wyman serves the community of Los Angeles at COR Healthcare Medical Associates in Torrance, California.

Dr. Wyman earned his medical doctorate from Johns Hopkins University School of Medicine in Baltimore before completing his internal medicine residency at Johns Hopkins Hospital in the same city. Dr. Wyman developed an interest in cardiology early in his career and later completed dual cardiology fellowships through Boston’s Beth Israel Hospital and Harvard Medical School in Cambridge, Massachusetts.

In addition to heart disease and heart attack treatment, anticoagulation management, and high blood pressure treatment, Dr. Wyman performs ongoing research in coronary artery stenting.

Dr. Wyman has many interests and hobbies outside of work. When he isn’t spending time with his wife and four children, he loves playing outdoor sports and cooking gourmet meals at home.