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Titolo:
Decreased chaos and increased nonlinearity of heart rate time series in patients with panic disorder
Autore:
Rao, RKA; Yeragani, VK;
Indirizzi:
Indian Inst Sci, Dept ECE, Bangalore, Karnataka, India Indian Inst Sci Bangalore Karnataka India E, Bangalore, Karnataka, India Wayne State Univ, Sch Med, Dept Psychiat, Detroit, MI USA Wayne State Univ Detroit MI USA Sch Med, Dept Psychiat, Detroit, MI USA
Titolo Testata:
AUTONOMIC NEUROSCIENCE-BASIC & CLINICAL
fascicolo: 1-2, volume: 88, anno: 2001,
pagine: 99 - 108
SICI:
1566-0702(20010412)88:1-2<99:DCAINO>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUDDEN CARDIAC DEATH; ACUTE MYOCARDIAL-INFARCTION; POWER-SPECTRAL-ANALYSIS; RATE-VARIABILITY; REPOLARIZATION LABILITY; PERIOD VARIABILITY; LYAPUNOV EXPONENTS; MULTIPLE-SCLEROSIS; RATE DYNAMICS; CORRELATION DIMENSION;
Keywords:
anxiety; panic disorder; nonlinear; chaos; spectral; heart rate variability; Lyapunov exponent; posture;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
82
Recensione:
Indirizzi per estratti:
Indirizzo: Yeragani, VK Wayne State Univ, Sch Med, Flat 16,KCN Mansion, Bangalore 560001, Karnataka, India Wayne State Univ Flat 16,KCN Mansion Bangalore Karnataka India 560001
Citazione:
R.K.A. Rao e V.K. Yeragani, "Decreased chaos and increased nonlinearity of heart rate time series in patients with panic disorder", AUTON NEURO, 88(1-2), 2001, pp. 99-108

Abstract

In this study, we investigated measures of nonlinear dynamics and chaos ofheart rate time series in 30 normal control subjects and 36 age-matched patients with panic disorder in supine and standing postures. We obtained minimum embedding dimension (MED), largest Lyapunov exponent (LLE) and measures of nonlinearity (NL) of heart rate time series. MED quantifies system's complexity, LLE predictability and NL, deviation from linear processes. There was a significant increase in complexity (p < 0.00001), an increase in predictability (decreased chaos) (p < 0.00001) and an increase in nonlinearity (S-net GS) (p = 0.00001), especially in supine posture in patients with panic disorder. Increased NL score in supine posture may be due to a relative increase in cardiac sympathetic activity and an overall decrease in LLE may indicate an impaired cardiac autonomic flexibility in these patients duepossibly to a decrease in cardiac vagal activity. These findings may further explain the reported higher incidence of cardiovascular mortality in patients with anxiety disorders. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 23/01/20 alle ore 12:28:08