Sinoatrial block
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Sinoatrial Block (SA Block)
| Normal to slow, defined by duration of frequency of block |
| Irregular when a block occurs |
| Upright and uniform, except during the dropped beat |
| Normal (0.12 - 0.20 sec), except during the dropped beat |
| Normal (0.06 - 0.10 sec), except during the dropped beat |
- Cardiac output will decrease, possibly causing syncope or dizziness.
- Occurs in some multiple of the PP interval.
- After dropped beat, cycles continue on time.