Sinus Bradycardia

This is part of: Sinus node rhythms and arrhythmias

Sinusbradycardia
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Atrial rate	< 60 bpm
Ventricular rate	same
Regularity	regular
Origin	sinus node
P-wave	normal
Effect of adenosine	slows down
Example ECG: Sinusbradycardia of around 40 bpm.
Example ECG2:

In sinusbradycardia the sinus node fires at a slow (<60 bpm) rate. This can be caused by e.g.: medication (beta-blockers), ischemia (typically inferior myocardial infarction with involvement of the sinus node artery), hypothermia and hypothyroidism. In an athlete a resting heart rate of < 60 bpm often is normal.