Health Dictionary
Reliable, easy-to-read patient information on common medical conditions — written in plain language, free of jargon, and grounded in current evidence. Browse the most frequent diagnoses, understand what they mean for everyday life, and learn which steps and questions help you have a focused conversation with your doctor.
Extrasystoles
Introduction
Extrasystoles or extra heart beats can have two origins:
- Premature atrial contractions emanating from the atria or upper chambers of the heart
- Premature ventricular contractions emanating from the ventricles or lower chambers of the heart
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]