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.
Sinus bradycardia electrocardiogram
Introduction
Overview
Overview
Electrocardiogram
Electrocardiogram
- Rate: Less than 60
- Rhythm: Regular
- P waves: Upright, consistent, and normal in morphology and duration
- PR Interval: Between 0.12-0.21 seconds in duration
- QRS complex: Less than 0.12 seconds in width, and consistent in morphology
- Early repolarization is accentuated in the setting of sinus bradycardia
- Sinus arrhythmia often accompanies sinus brdycardia
EKG Examples
Shown below is an EKG depicting sinus bradycardia. The heart rate is around 40 bpm. It also shows PR prolongation and decrease in QRS complex.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/File:Rhythm_sinusbradycardia.png
Shown below is an EKG example of sinus bradycardia. The heart rate is around 45 bpm. It also shows PR prolongation and a shortening of the QRS complexes.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/File:Sinusbradycardia.png
Shown below is an EKG example of sinus bradycardia. The heart rate is around 45 bpm.
Copyleft image obtained courtesy of ECGpedia, http://en.ecgpedia.org/wiki/Main_Page
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Cafer Zorkun, M.D., Ph.D. [2]