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| = Sinoatrial Block (SA Block) =
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| {| border="1"
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| |-
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| | '''Rate'''
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| | Normal to slow, defined by duration of frequency of block
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| |-
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| | '''Rhythm'''
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| | Irregular when a block occurs
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| |-
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| | '''P wave'''
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| | Upright and uniform, except during the dropped beat
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| |-
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| | '''PR interval'''
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| | Normal (0.12 - 0.20 sec), except during the dropped beat
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| |-
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| | '''QRS'''
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| | 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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