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- W2071661818 abstract "In this study, we investigated measures of nonlinear dynamics and chaos of heart 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 (Snet 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 due possibly to a decrease in cardiac vagal activity. These findings may further explain the reported higher incidence of cardiovascular mortality in patients with anxiety disorders." @default.
- W2071661818 created "2016-06-24" @default.
- W2071661818 creator A5001935220 @default.
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- W2071661818 date "2001-04-01" @default.
- W2071661818 modified "2023-10-12" @default.
- W2071661818 title "Decreased chaos and increased nonlinearity of heart rate time series in patients with panic disorder" @default.
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- W2071661818 doi "https://doi.org/10.1016/s1566-0702(01)00219-3" @default.
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