Temporal associations between thoracic volume overload and malignant ventricular arrhythmias: a study of intrathoracic impedance.
J Cardiovasc Electrophysiol
; 22(3): 293-9, 2011 Mar.
Article
em En
| MEDLINE
| ID: mdl-20946226
ABSTRACT
BACKGROUND:
Acute exacerbations of heart failure (HF) are believed to trigger malignant ventricular arrhythmias, but the temporal association between fluid accumulation and ventricular arrhythmias has not been evaluated in an objective manner. We hypothesized that increased intrathoracic fluid accumulation in patients with HF, as measured by an index of intrathoracic impedance, is associated with an increased risk of ventricular arrhythmias. METHODS ANDRESULTS:
We analyzed interrogations in a cohort of 96 patients with left ventricular dysfunction (EF ≤ 35%) with devices that monitor intrathoracic impedance (OptiVol fluid index). Treated episodes of ventricular tachycardia or fibrillation (VT/VF) were adjudicated and stratified according to predetermined fluid index thresholds (OptiVol indices of 15, 30, 45, 60 Ω-days). VT/VF episodes occurred in 16 patients (17%). VT/VF was more common on days when the fluid index was elevated using threshold values of 15, 30, and 45 Ω-days (P = 0.006, 0.04, 0.02, respectively). There were no differences in the percent of time above any threshold between patients with and without VT/VF.CONCLUSIONS:
In patients with HF who develop VT/VF, volume overload, as detected by an index incorporating changes in intrathoracic impedance, was temporally associated with malignant ventricular tachyarrhythmias.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fibrilação Ventricular
/
Cardiografia de Impedância
/
Taquicardia Ventricular
/
Disfunção Ventricular Esquerda
/
Insuficiência Cardíaca
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
/
Risk_factors_studies
Limite:
Aged
/
Aged80
/
Female
/
Humans
/
Male
/
Middle aged
País/Região como assunto:
America do norte
Idioma:
En
Revista:
J Cardiovasc Electrophysiol
Assunto da revista:
ANGIOLOGIA
/
CARDIOLOGIA
/
FISIOLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Estados Unidos