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| = Sinoatrial Block (SA Block) =
| | #REDIRECT [[Sino-atrial exit block]] |
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| {|
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| |+ During the event
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| |-
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| |Rate || Normal to slow || Defined by duration of frequency of block
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| |-
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| |Rhythm || Irregular when a block occurs
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| |P wave || Upright and uniform, except during the dropped beat
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| |PR interval || Normal (0.12 - 0.20 sec), except during the dropped beat
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| |QRS || Normal (0.06 - 0.10 sec), except during the dropped beat
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| |}
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| - Cardiac output will decrease, possibly causing syncope or dizziness.
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| - Occurs in some multiple of the PP interval.
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| - After dropped beat, cycles continue on time.
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