Dr. Robert Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.
Dr. Robert Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.
Dr. Robert Drennan is an electrophysiologist with CIS in Baton Rouge and Zachary. He completed his Bachelor of Science degree in biochemistry and molecular biology, as well as a Bachelor of Arts degree in chemistry, at the College of Charleston in South Carolina. He earned his doctorate of medicine from the University of South Carolina School of Medicine in Columbia, South Carolina. He completed a residency in internal medicine from the Tulane University School of Medicine in New Orleans. He also completed both his cardiology and electrophysiology fellowship at the Louisiana State University Health Science Center in New Orleans.
Dr. Drennan is board-certified in internal medicine, cardiology, nuclear cardiology and clinical electrophysiology. He previously worked at Touro Infirmary, and he also worked as a lab assistant at the Medical University of South Carolina and at the College of Charleston.
Dr. Drennan is a member of the American College of Cardiology, the Heart Rhythm Society, and the American Society of Nuclear Cardiology. He has presented, researched and written for numerous publications on a variety of topics including sudden cardiac arrest, atrial fibrillation, and peripheral arterial disease. He has earned many awards, such as the Douglas Scholarship and the College of Charleston Founder’s Scholarship.

DDr. Dtennan is undeniably an outstanding physician with whom I have had the honor of being a patient for an extended period. His patient-centered approach and sincere empathy undeniably establish him as an invaluable asset in the medical field. I am truly grateful to have him as my doctor.
Very professional and easy to talk to.
Always know l have a wonderful Doctor who gives me wonderful care.
Awesome
Great Dr runs on time very honest with you
Dr. Brennan was so friendly, I felt as if I had known him for years.
Professional
I love my Doctor he is the best I wouldn't want anyone else taking care of me.
Dr. Drennan is an absolute exceptional doctor! It takes his time with his patients to not only listen to their concerns but also ask about how their personal lives are going. He has literally saved my life with surgery when every other doctor dismissed me with "anxiety". He is not only a brilliant doctor but also a very caring person with a great bedside manner whether it be in the operating room or the office. 10/10 would recommend Dr. Drennan to anyone who needs a cardiologist and in fact I do recommend everyone I know to him. Amazing experience every time! Thanks for all your hard work and dedication Dr. Drennan, it doesn't go unnoticed by your patients!
Excellent all around