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Titolo:
Diurnal variations of the dominant cycle length of chronic atrial fibrillation
Autore:
Meurling, CJ; Waktare, JEP; Holmqvist, F; Hedman, A; Camm, AJ; Olsson, SB; Malik, M;
Indirizzi:
Univ London St Georges Hosp, Sch Med, Dept Cardiol Sci, London SW17 0RE, England Univ London St Georges Hosp London England SW17 0RE on SW17 0RE, England Univ Lund Hosp, Dept Cardiol, S-22185 Lund, Sweden Univ Lund Hosp Lund Sweden S-22185 p, Dept Cardiol, S-22185 Lund, Sweden Kuopio Univ Hosp, Dept Med, SF-70210 Kuopio, Finland Kuopio Univ Hosp Kuopio Finland SF-70210 t Med, SF-70210 Kuopio, Finland
Titolo Testata:
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
fascicolo: 1, volume: 280, anno: 2001,
pagine: H401 - H406
SICI:
0363-6135(200101)280:1<H401:DVOTDC>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
CIRCADIAN VARIATION; HEART-RATE; RADIOFREQUENCY ABLATION; VENTRICULAR RESPONSE; REFRACTORY PERIOD; BLOOD-PRESSURE; FLUCTUATIONS; ARRHYTHMIAS; INTERVAL; RHYTHM;
Keywords:
autonomic nervous system; circadian rhythms;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Waktare, JEP Univ London St Georges Hosp, Sch Med, Dept Cardiol Sci, Cramner Terrace, London SW17 0RE, England Univ London St Georges Hosp Cramner Terrace London England SW17 0RE
Citazione:
C.J. Meurling et al., "Diurnal variations of the dominant cycle length of chronic atrial fibrillation", AM J P-HEAR, 280(1), 2001, pp. H401-H406

Abstract

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 meanwas 157 +/- 22 ms (P = 0.0002). Diurnal fluctuation in DACL differed amongpatients: 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 thesole determinant of atrial cycle length during atrial fibrillation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/11/20 alle ore 20:04:19