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Titolo:
Heart rate variability patterns before ventricular tachycardia onset in patients with as implantable cardioverter defibrillator
Autore:
Lombardi, F; Porta, A; Marzegalli, M; Favale, S; Santini, M; Vincenti, A; De Rosa, A;
Indirizzi:
Univ Milan, Osp S Paolo, Dipartimento Med Chirurg & Odontol, I-20142 Milan, Italy Univ Milan Milan Italy I-20142 d Chirurg & Odontol, I-20142 Milan, Italy Osp S Carlo, Milan, Italy Osp S Carlo Milan ItalyOsp S Carlo, Milan, Italy Policlin Bari, Bari, Italy Policlin Bari Bari ItalyPoliclin Bari, Bari, Italy Osp S Filippo Neri, Rome, Italy Osp S Filippo Neri Rome ItalyOsp S Filippo Neri, Rome, Italy Osp S Gerardo, Monza, Italy Osp S Gerardo Monza ItalyOsp S Gerardo, Monza, Italy Medtron, Milan, Italy Medtron Milan ItalyMedtron, Milan, Italy
Titolo Testata:
AMERICAN JOURNAL OF CARDIOLOGY
fascicolo: 9, volume: 86, anno: 2000,
pagine: 959 - 963
SICI:
0002-9149(20001101)86:9<959:HRVPBV>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACUTE MYOCARDIAL-INFARCTION; FREQUENCY-DOMAIN MEASURES; CORONARY-ARTERY DISEASE; ARRHYTHMIC EVENTS; NEURAL ACTIVITY; SUDDEN-DEATH; FIBRILLATION; MORTALITY; DYNAMICS; FAILURE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
30
Recensione:
Indirizzi per estratti:
Indirizzo: Lombardi, F Univ Milan, Osp S Paolo, Dipartimento Med Chirurg & Odontol, Via A Rudini 8, I-20142 Milan, Italy Univ Milan Via A Rudini 8 Milan Italy I-20142 42 Milan, Italy
Citazione:
F. Lombardi et al., "Heart rate variability patterns before ventricular tachycardia onset in patients with as implantable cardioverter defibrillator", AM J CARD, 86(9), 2000, pp. 959-963

Abstract

Time- and frequency-domain analysis of heart rate variability (HRV) has been proven effective in describing alteration of autonomic control mechanisms and in identifying patients with increased cardiac and arrhythmic mortality. Patients with implantable cardioverter defibrillators offer the opportunity to evaluate HRV patterns before ventricular tachycardia (VT) and undercontrol conditions. We therefore analyzed time- and frequency-domain parameters of short-term HRV and power-law behavior of RR interval time series at rest, at 15 to 30 minutes, and immediately before VT. In comparison to control conditions, lower values of mean cycle length duration and total power were observed before VT. Spectral analysis indicated that the low- to high-frequency ratio was significantly higher (5.5 +/- 0.6 vs 2.8 +/- 0.3) immediately before VT than during rest, Both findings were consistent with theshift of sympathovagal balance toward sympathetic predominance and reducedvagal tone. Before VT, a more negative value of the scaling exponent beta of the power-frequency relation (-1.57 +/- 0.04 vs -1.33 +/- 0.04) also confirmed the presence of an altered HRV pattern in comparison to controls. Thus, both abnormal autonomic modulation and dynamic patterns of HRV seem to characterize the minutes before arrhythmia onset in these patients, (C)2000by Excerpta Medico, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/01/20 alle ore 03:53:08