Sinus bradycardia 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

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