The QT Interval as a Noninvasive Marker of Atrial Refractoriness.
Pacing Clin Electrophysiol
; 39(12): 1366-1372, 2016 Dec.
Article
em En
| MEDLINE
| ID: mdl-27753113
ABSTRACT
BACKGROUND:
Atrial refractoriness may be an important determinant of atrial fibrillation (AF) risk, but its measurement is not clinically accessible. Because the QT interval predicts incident AF and the atrium and ventricle share repolarizing ion currents, we investigated the association between an individual's QT interval and atrial effective refractory period (AERP).METHODS:
In paroxysmal AF patients presenting for catheter ablation, the QT interval was measured from the surface 12-lead electrocardiogram. The AERP was defined as the longest S1-S2 coupling interval without atrial capture using a 600-ms drive cycle length.RESULTS:
In 28 patients, there was a positive correlation between QTc and mean AERP. After multivariate adjustment, a 1-ms increase in QTc predicted a 0.70-ms increase in AERP.CONCLUSIONS:
The QTc interval reflects the AERP, suggesting that the QTc interval may be used as a marker of atrial refractoriness relevant to assessing AF risk and mechanism-specific therapeutic strategies.Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fibrilação Atrial
/
Síndrome do QT Longo
/
Diagnóstico por Computador
/
Eletrocardiografia
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Evaluation_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Adult
/
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
Idioma:
En
Revista:
Pacing Clin Electrophysiol
Ano de publicação:
2016
Tipo de documento:
Article