{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,15]],"date-time":"2026-05-15T06:07:52Z","timestamp":1778825272654,"version":"3.51.4"},"reference-count":38,"publisher":"American Physiological Society","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["American Journal of Physiology-Heart and Circulatory Physiology"],"published-print":{"date-parts":[[2001,1,1]]},"abstract":"<jats:p> High-resolution digital Holter recording was carried out in 21 patients (15 men, 64 \u00b1 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 \u00b1 17 ms, and nighttime mean was 157 \u00b1 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 &lt; 0.001, correlation of mean DACL to night-day difference). Mean DACL also correlated with ventricular cycle length ( R = 0.40, P &lt; 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. <\/jats:p>","DOI":"10.1152\/ajpheart.2001.280.1.h401","type":"journal-article","created":{"date-parts":[[2017,12,22]],"date-time":"2017-12-22T09:08:25Z","timestamp":1513933705000},"page":"H401-H406","source":"Crossref","is-referenced-by-count":31,"title":["Diurnal variations of the dominant cycle length of chronic atrial fibrillation"],"prefix":"10.1152","volume":"280","author":[{"given":"Carl J.","family":"Meurling","sequence":"first","affiliation":[{"name":"Department of Cardiology, Lund University Hospital, Lund, Sweden;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Johan E. 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