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Robert Drennan, M.D. Shadow

Robert Drennan, M.D.

Cardiovascular Institute of the South

6550 Main Street, Suite 1000, Zachary, LA 70791

(225) 654-1559


Board Certification

Internal Medicine, Cardiology and Nuclear Cardiology

Medical Education

University of South Carolina School of Medicine


Tulane University School of Medicine


Louisiana State University Health Science Center

Dr. Robert Drennan is an electrophysiologist with CIS in Baton Rouge.  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 and nuclear cardiology.  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.