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Titolo:
Effect of atrial pressure increase on effective refractory period and vulnerability to atrial fibrillation in patients with lone atrial fibrillation
Autore:
Efremidis, M; Sideris, A; Prappa, E; Fillipatos, G; Athanasias, D; Kardara, D; Sioras, I; Kardaras, F;
Indirizzi:
Evangelismos Gen Hosp, Dept Cardiol 2, Athens, Greece Evangelismos Gen Hosp Athens Greece osp, Dept Cardiol 2, Athens, Greece
Titolo Testata:
JOURNAL OF INTERVENTIONAL CARDIAC ELECTROPHYSIOLOGY
fascicolo: 4, volume: 3, anno: 1999,
pagine: 307 - 310
SICI:
1383-875X(199912)3:4<307:EOAPIO>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTRACTION-EXCITATION FEEDBACK; HEART; CALCIUM; HUMANS;
Keywords:
lone atrial fibrillation; mechanoelectrical feedback; effective refractory period; atrial pressure increase;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Citazioni:
13
Recensione:
Indirizzi per estratti:
Indirizzo: Efremidis, M Megalou Alexandrou 42,Nea Smirni, Athens 17122, Greece Megalou Alexandrou 42,Nea Smirni Athens Greece 17122 Greece
Citazione:
M. Efremidis et al., "Effect of atrial pressure increase on effective refractory period and vulnerability to atrial fibrillation in patients with lone atrial fibrillation", J INTERV C, 3(4), 1999, pp. 307-310

Abstract

Background: There is evidence suggesting that atrial fibrillation (AF) maybe induced by acute increase of atrial pressure. The aim of the present study was to investigate the effect of alterations in atrial pressure, induced by varying the atrioventricular (AV) interval, on atrial refractoriness, and on the frequency of induction of (AF), in patients with a history of lone atrial fibrillation (LAF). Methods and Results: Twenty-five patients were included in this study. Thepatients were divided in two groups: the LAF group, and the control group. None of the patients in either group had organic heart disease. Effective refractory period (ERP) and duration of atrial extrastimulus electrogram (A(2)) were measured at two right atrial sites (high lateral wall, atrial appendage) during AV pacing (cycle length: 500 msec) with different AV intervals. Peak, minimal and mean atrial pressure increased from 8.57 +/- 2.37 to 18.14 +/- 4.74 mm Hg, 2 +/- 2.23 to 5.14 +/- 2.60 mm Hg (p = 0.0001) and from 4.28 +/- 1.6 mm Hg to 9.77 +/- 2.9 mm Hg (p = 0.001), respectively during AV interval modification. During lateral and atrial appendage pacing, with a progressive decrease of AV interval to 160, 100, 80, 40, 0 msec, the ERP, the dispersion of ERP, functional refractory period (FRP), A2 and latency period (LP) did not change significantly, in both groups. The frequency of induction of AF was not statistically different in both lateral atrial wall and appendage, during pacing in different AV intervals. Conclusions: This study demonstrates that alterations in the intraatrial pressure does not have important effects on atrial refractoriness and does not increase vulnerability to AF in patients with a history of LAF.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 24/11/20 alle ore 22:41:52