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Sinus arrhythmia Sinus Arrhythmia (Example 1) Sinus Arrhythmia (Example 2) The sinus node rate can change with inspiration/expiration, especially in younger people. The heart rate speeds up with inspiration (since it inhibits vagal tone) and decreases with expiration (higher vagal tone). The ECG criteria to diagnose sinus arrythmia is a variation of the P-P interval from one beat to the next of at least 0.12 seconds or 120 milliseconds. Sinus arrhythmia, if not in a young person and not occurring with repsiration, may be a sign of sick sinus syndrome (SSS). Sick sinus syndrome occurs when over time the sinus node scars and becomes replaced with fibrous tissues. SSS contains a spectrum of arrhythmias including severe sinus bradycardia, tachycardic-bradycardic syndrome (tachy-brady syndrome), or sinus exit block/sinus pauses. |
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