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Bradyarrhythmias
Bradyarrhythmias are abnormal rhythms resulting in slowing of the heart rate, due to sinus node dysfunction, sinoatrial exit block or atrioventricular block. This may occur in combination with pathology affecting the atria or ventricles, such as atrial fibrillation or atrial flutter.
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Sinus Node Dysfunction
- Overview of sinus node dysfunction
Sinus Bradycardia
Regular RR interval with normal PR interval and normal axis
Sinus Arrhythmia
Irregular PP / RR intervals, otherwise sinus rhythm
Sinus Arrest
No P waves or QRS complexes for >3 seconds, with or without an escape rhythm
Sinoatrial Exit Block
Missed P waves due to delayed sinoatrial conduction
Tachy-Brady Syndrome
Alternating bradycardia and supraventricular tachycardia