| Diurnal variations of the dominant cycle length of chronic atrial fibrillation. | |
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MedLine Citation:
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PMID: 11123257 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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High-resolution digital Holter recording was carried out in 21 patients (15 men, 64 +/- 12 yr) with chronic atrial fibrillation. Dominating atrial cycle length (DACL) was derived by frequency domain analysis of QRST-reduced electrocardiograms. Daytime mean DACL was 150 +/- 17 ms, and nighttime mean was 157 +/- 22 ms (P = 0. 0002). Diurnal fluctuation in DACL differed among patients: it tended to be virtually absent in those with a short mean DACL, but in those with longer DACL the night-day difference was as much as 23 ms (R = 0.72, P < 0.001, correlation of mean DACL to night-day difference). Mean DACL also correlated with ventricular cycle length (R = 0.40, P < 0.001), particularly at night (r = 0.49). The shorter cycle lengths found in this study during the day are consistent with sympathetic and/or other physiological modulation, but since increased vagal tone shortens atrial refractoriness in most models, parasympathetic influences are not likely to play a major role. Alternatively, atrial effective refractory period may not be the sole determinant of atrial cycle length during atrial fibrillation. |
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Authors:
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C J Meurling; J E Waktare; F Holmqvist; A Hedman; A J Camm; S B Olsson; M Malik |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: American journal of physiology. Heart and circulatory physiology Volume: 280 ISSN: 0363-6135 ISO Abbreviation: Am. J. Physiol. Heart Circ. Physiol. Publication Date: 2001 Jan |
Date Detail:
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Created Date: 2001-02-02 Completed Date: 2001-02-02 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 100901228 Medline TA: Am J Physiol Heart Circ Physiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: H401-6 Citation Subset: IM |
Affiliation:
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Department of Cardiology, Lund University Hospital, Lund, Sweden. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adult Aged Atrial Fibrillation / physiopathology* Chronic Disease Circadian Rhythm* Electrocardiography, Ambulatory Female Heart / physiopathology* Heart Rate Humans Male Middle Aged Signal Processing, Computer-Assisted |
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