Sinus Bradycardia
From ECGpedia
| This is part of: Sinus node rhythms and arrhythmias |
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| Atrial frequency | < 60 bpm |
| Ventricular frequency | same |
| Regularity | regular |
| Origin | sinus node |
| P-wave | normal |
| Effect of adenosine | slows down |
Example: Sinusbradycardia of around 40 bpm.
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In sinus bradycardia the sinus node fires at a slow (<60 bpm) rate. Causes of sinus bradycardia include:
- Normal physiology in an athelete
- Medication (beta-blockers)
- Ischemia (typically inferior myocardial infarction with involvement of the sinus node artery)
- Hypothermia
- Hypothyroidism.
