Sinus Rhythms

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Last updated 3:28 AM on 6/18/26
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39 Terms

1
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Normal sinus rhythm rate

60–100 bpm

2
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Normal sinus rhythm rhythm

Regular

3
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Normal sinus rhythm P-wave

Normal and upright, one before every QRS

4
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Normal sinus rhythm PRI

0.12–0.20 seconds, constant

5
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Normal sinus rhythm QRS

< 0.12 seconds
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Sinus bradycardia rate

< 60 bpm
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Sinus bradycardia rhythm

Regular

8
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Sinus bradycardia P-wave

Normal and upright, one before every QRS

9
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Sinus bradycardia PRI

0.12–0.20 seconds, constant

10
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Sinus bradycardia QRS

< 0.12 seconds
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Sinus bradycardia etiology

Increased parasympathetic (vagal) tone, intrinsic SA node disease, drug effects, may be normal in healthy persons

12
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Sinus bradycardia clinical significance

May result in decreased cardiac output, hypotension, angina, or CNS depressant effects

13
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Sinus tachycardia rate

100 bpm

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Sinus tachycardia rhythm

Regular

15
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Sinus tachycardia P-wave

Normal and upright, one before every QRS

16
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Sinus tachycardia PRI

0.12–0.20 seconds, constant

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Sinus tachycardia QRS

< 0.12 seconds
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Sinus tachycardia etiology

Results from increased SA node discharge

19
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Sinus tachycardia clinical significance

Decreased cardiac output

20
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Sinus dysrhythmia rate

60–100 bpm

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Sinus dysrhythmia rhythm

Varies with respirations, irregular

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Sinus dysrhythmia P-wave

Normal and upright, one before every QRS

23
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Sinus dysrhythmia PRI

0.12–0.20 seconds, constant

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Sinus dysrhythmia QRS

< 0.12 seconds
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Sinus dysrhythmia etiology

Often a normal finding related to respiratory cycle

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Sinus block rate

Varies

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Sinus block rhythm

Irregular

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Sinus block P-wave

Normal and upright, one before every QRS

29
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Sinus block PRI

0.12–0.20 seconds, constant

30
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Sinus block QRS

< 0.12 seconds
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Sinus block etiology

Occurs when SA node fails to discharge

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Sinus block clinical significance

Frequent or prolonged episodes may decrease cardiac output and cause syncope

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Sinus arrest rate

Normal to slow

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Sinus arrest rhythm

Irregular

35
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Sinus arrest P-wave

Normal and upright, one before every QRS

36
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Sinus arrest PRI

0.12–0.20 seconds, constant

37
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Sinus arrest QRS

< 0.12 seconds
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Sinus arrest etiology

Occurs when SA node fails to discharge

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Sinus arrest clinical significance

Frequent or prolonged episodes may decrease cardiac output and cause syncope