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Titolo:
Heart rate variability analysis of patients with idiopathic left ventricular outflow tract tachycardia - Role of triggered activity
Autore:
Shimoike, E; Ueda, N; Maruyama, T; Kaji, Y; Kanaya, S; Fujino, T; Niho, Y;
Indirizzi:
Kyushu Univ, Sch Med, Dept Internal Med 1, Higashi Ku, Fukuoka 8128582, Japan Kyushu Univ Fukuoka Japan 8128582 1, Higashi Ku, Fukuoka 8128582, Japan Kyushu Univ, Sch Med, Inst Hlth Sci, Higashi Ku, Fukuoka 8128582, Japan Kyushu Univ Fukuoka Japan 8128582 ci, Higashi Ku, Fukuoka 8128582, Japan
Titolo Testata:
JAPANESE CIRCULATION JOURNAL-ENGLISH EDITION
fascicolo: 8, volume: 63, anno: 1999,
pagine: 629 - 635
SICI:
0047-1828(199908)63:8<629:HRVAOP>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
MECHANISMS; DILTIAZEM; FREQUENCY;
Keywords:
heart rate variability; left ventricular outflow tract; triggered activity; ventricular tachycardia;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Clinical Medicine
Life Sciences
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Shimoike, E Kyushu Univ, Sch Med, Dept Internal Med 1, Higashi Ku, 3-1-1 Maidashi, Fukuoka 8128582, Japan Kyushu Univ 3-1-1 Maidashi Fukuoka Japan 8128582 28582, Japan
Citazione:
E. Shimoike et al., "Heart rate variability analysis of patients with idiopathic left ventricular outflow tract tachycardia - Role of triggered activity", JPN CIRC J, 63(8), 1999, pp. 629-635

Abstract

There have been several reports with respect to idiopathic ventricular tachycardias (VTs) originating from the left ventricular outflow tract (LVOT). A previous report suggested that triggered activity plays a partial role in idiopathic LVOT tachycardia from the electrophysiological as well as the electropharmacological viewpoint. However, the exact role of triggered activity in this type of VT remains unknown. In the present study the relationship of the frequency of premature ventricular contractions (PVCs) and heartrate was examined and heart rate variability (HRV) was analyzed in 2 casesof LVOT tachycardia using 24-h Holter electrocardiographic (ECG) monitoring. The relation between the PVCs frequency and heart rate showed a persistently positive correlation, indicating frequent PVCs as heart rate increased. In HRV analysis, NN50 (%), a time-domain variable of parasympathetic activity, showed no change prior to ventricular arrhythmias. In frequency-domain analysis of HRV, the high frequency (HF) component tended to fall prior to repetitive PVCs and VTs. The ratio of the low frequency to high frequency(LF/HF) components increased prior to single PVCs, repetitive PVCs and VTs. Sympathetic predominance predisposes the genesis of these kinds of arrhythmias originating from the LVOT and it is suggested that triggered activityplays an important role in LVOT tachycardia, at least in its initiation.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 18/01/20 alle ore 21:42:20