About / Overview
Dr. Leonardo Knijnik is a cardiac electrophysiologist specializing in atrial fibrillation treatment, complex arrhythmia management and implantable cardiac devices at Erlanger Cardiology.
Dr. Knijnik was drawn to cardiac electrophysiology because of its unique ability to improve and often transform patients' quality of life. He is passionate about diagnosing and treating heart rhythm disorders and is continually refining his techniques to deliver the best possible outcomes for his patients. His goal is to help people live healthier, more active lives by providing advanced, personalized care.
Dr. Knijnik held leadership roles throughout his training, serving as Chief Resident at the Bruce Carter Miami Veterans Affairs Medical Center and Chief Fellow during his fellowship at Emory University.
Dr. Knijnik is fluent in English, Portuguese, and Spanish. When not caring for patients, Dr. Knijnik enjoys paddleboarding, reading and spending time with his family.
Clinical Interests
- Atrial fibrillation (AFib)
- Atrial tachycardia
- Electrophysiology
- General Cardiology
- Ventricular fibrillation
- Ventricular tachycardia
Certifications
- American Board of Internal Medicine, Cardiovascular Disease
- American Board of Internal Medicine, Internal Medicine
Education / Credentials
Medical School
Federal University of Rio Grande do Sul, Brazil
Residency - Internal Medicine
Bruce Carter Miami Veterans Affairs Medical Center, University of Miami/Jackson Memorial Hospital, Miami FL
Fellowship - Cardiovascular Disease
Emory University, Atlanta GA
Fellowship – Electrophysiology
Emory University, Atlanta GA
Publications
Pooled Efficacy and Safety of Left Atrial Appendage Occlusion Versus Direct Oral Anticoagulants or Antiplatelets: A Meta-Analysis of the Landmark Randomized Trials
Published September 3, 2026
DOI: 10.1111/jce.70493
Vascular closure devices in electrophysiology procedures: Systematic review and meta-analysis
Published May 8, 2026
DOI: 10.1016/j.hroo.2026.04.023
Clinical outcomes of automatic algorithms in cardiac resynchronization therapy: Systematic review and meta-analysis
Published September 13, 2023
DOI: 10.1016/j.hroo.2023.09.001
Locations
Erlanger Cardiology 
4312 Holiday Inn Express Way NW, Suite 203, Cleveland, TN 37312
