Sinus arrhythmia: Difference between revisions
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==Overview== | ==Overview== | ||
Sinus arrhythmia is a variation in the rate of the SA node. It is the most common type of arrhythmia and is considered to be a normal variant. It is more common in the young, especially with slower heart rates or after enhanced vagal tone. It also decreases with age or with auatonomic dysfunction. The formal definition of sinus arrhythmia is a variation in the P-P interval by 0.12 sec (120 msec) or more in the presence of normal P waves and the usual PR interval. There are two types of sinus arrhythmia: respiratory, or phasic; and nonrespiratory, or nonphasic. | Sinus arrhythmia is a variation in the rate of the SA node. It is the most common type of arrhythmia and is considered to be a normal variant. It is more common in the young, especially with slower heart rates or after enhanced vagal tone. It also decreases with age or with auatonomic dysfunction.<ref name="pmid17034928">{{cite journal| author=Masi CM, Hawkley LC, Rickett EM, Cacioppo JT| title=Respiratory sinus arrhythmia and diseases of aging: obesity, diabetes mellitus, and hypertension. | journal=Biol Psychol | year= 2007 | volume= 74 | issue= 2 | pages= 212-23 | pmid=17034928 | doi=10.1016/j.biopsycho.2006.07.006 | pmc=PMC1804292 | url=http://www.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&tool=sumsearch.org/cite&retmode=ref&cmd=prlinks&id=17034928 }} </ref> The formal definition of sinus arrhythmia is a variation in the P-P interval by 0.12 sec (120 msec) or more in the presence of normal P waves and the usual PR interval. There are two types of sinus arrhythmia: respiratory, or phasic; and nonrespiratory, or nonphasic. | ||
==Classification== | ==Classification== | ||
Revision as of 19:28, 6 September 2013
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rim Halaby, M.D. [2]
Overview
Sinus arrhythmia is a variation in the rate of the SA node. It is the most common type of arrhythmia and is considered to be a normal variant. It is more common in the young, especially with slower heart rates or after enhanced vagal tone. It also decreases with age or with auatonomic dysfunction.[1] The formal definition of sinus arrhythmia is a variation in the P-P interval by 0.12 sec (120 msec) or more in the presence of normal P waves and the usual PR interval. There are two types of sinus arrhythmia: respiratory, or phasic; and nonrespiratory, or nonphasic.
Classification
Respiratory Sinus Arrhythmia
Non-respiratory Sinus Arrhythmia
- In this type, the variation in the P-P interval is unrelated to the respiratory cycle. It can occur in the normal heart, the diseased heart or a side effect of some medications.
Ventriculophasic Sinus Arrhythmia
- A ventriculophasic sinus arrhythmia occurs most often in patients with third degree AV block, but it's also observed after a compensatory pause induced by a premature ventricular contraction.[2]
References
- ↑ Masi CM, Hawkley LC, Rickett EM, Cacioppo JT (2007). "Respiratory sinus arrhythmia and diseases of aging: obesity, diabetes mellitus, and hypertension". Biol Psychol. 74 (2): 212–23. doi:10.1016/j.biopsycho.2006.07.006. PMC 1804292. PMID 17034928.
- ↑ de Marchena E, Colvin-Adams M, Esnard J, Ridha M, Castellanos A, Myerburg RJ (2003). "Ventriculophasic sinus arrhythmia in the orthotopic transplanted heart: mechanism of disease revisited". Int J Cardiol. 91 (1): 71–4. PMID 12957731.