Classification of Bradycardia and Atrioventricular (AV) Block
Bradycardia (sinus node disease and atrioventricular block)- Sinus bradycardia (see Table 44.3 for causes)
- Second-degree sino-atrial exit block
- Junctional escape secondary to profound sinus bradycardia or complete sino-atrial exit block or sinus arrest (Figure 44.2)
- Atrial fibrillation with slow ventricular rate (distinguished from atrial fibrillation with complete AV block by irregular RR interval)
- Atrial flutter/atrial tachycardia with high grade AV block
- Complete AV block with junctional or ventricular escape rhythm (Figure 44.6)
Atrioventricular block (see Table 44.4 for causes)
- First degree AV block (constant PR interval >200 ms)
- Second degree AV block, Mobitz type 1 (Wenckebach) (Figure 44.3)
- 2:1 second degree AV block (Figure 44.3)
- Second degree AV block, Mobitz type 2 (Figure 44.4)
- High grade AV block (e.g. 4;1 or 5:1 AV block)
- Third degree/complete AV block with junctional or ventricular escape rhythm (Figure 44.5)
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