Dr. David A. Olmstead

Westby Fisher, MD, a cardiac electrophysiologist at Endeavor Health, treats patients with irregular, fast or slow heart rhythms using the latest innovations in arrhythmia care. With a background in biomedical engineering, he brings technical insight to procedures such as leadless pacemakers and catheter ablation. Dr. Fisher prioritizes clear communication and devotes ample time to each patient to understand their needs and guide treatment decisions. Dr. Fisher is rated as a Distinguished provider by MediFind in the treatment of Atrioventricular Nodal Reentrant Tachycardia (AVNRT). His top areas of expertise are Atrial Fibrillation, His Bundle Tachycardia, Atrioventricular Nodal Reentrant Tachycardia (AVNRT), Pacemaker Implantation, and Cardiac Ablation.

Jose Nazari, MD, a cardiac electrophysiologist at Endeavor Health, specializes in diagnosing and treating arrhythmias through advanced, minimally invasive procedures. He combines a passion for medicine and technology to deliver precise, personalized care. Dr. Nazari is excited about emerging techniques like pulsed field ablation and is committed to improving patients’ quality of life through evidence-based treatments. Dr. Nazari is rated as a Distinguished provider by MediFind in the treatment of Atrioventricular Nodal Reentrant Tachycardia (AVNRT). His top areas of expertise are Atrial Fibrillation, His Bundle Tachycardia, Atrioventricular Nodal Reentrant Tachycardia (AVNRT), Cardiac Ablation, and Pacemaker Implantation.

Keith Atassi is an Internal Medicine provider in Valparaiso,, Indiana. Dr. Atassi is rated as a Distinguished provider by MediFind in the treatment of Atrioventricular Nodal Reentrant Tachycardia (AVNRT). His top areas of expertise are Coronary Heart Disease, Angina, Atherosclerosis, Endocarditis, and Pacemaker Implantation.