Sinus arrhythmia
| Sinus arrhythmia | |
|---|---|
 | |
| ECG of a 19-year-old female with sinus arrhythmia | |
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| Specialty | Cardiology |
| Diagnostic method | electrocardiogram |
Sinus arrhythmia is a normal variation of sinus rhythm, noticed as an irregular heart rate; fast when taking a breath in, and slow when breathing out.[1] It is commonly observed in children and young adults.[1] When present, sinus arrhythmia typically indicates good cardiovascular health.[2]
During respiration, the intermittent vagus nerve activation occurs, which results in beat to beat variations in the resting heart rate.[2] Sinus arrhythmia characteristically presents with an irregular rate in which the variation in the R-R interval is greater than 0.12 seconds.[2] Additionally, P waves are typically mono-form and in a pattern consistent with atrial activation originating from the sinus node.[2]
See also
References
- 1 2 Bunce, Nicholas H.; Ray, Robin; Patel, Hitesh (2020). "30. Cardiology". In Feather, Adam; Randall, David; Waterhouse, Mona (eds.). Kumar and Clark's Clinical Medicine (10th ed.). Elsevier. p. 1051. ISBN 978-0-7020-7870-5. Archived from the original on 2022-02-12. Retrieved 2022-02-11.
- 1 2 3 4 Soos, Michael P.; McComb, David (2020-08-24). "Sinus Arrhythmia". NCBI Bookshelf. PMID 30725696. Archived from the original on 2020-11-01. Retrieved 17 November 2020.
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