Journal
SCHIZOPHRENIA RESEARCH
Volume 112, Issue 1-3, Pages 153-157Publisher
ELSEVIER
DOI: 10.1016/j.schres.2009.03.042
Keywords
Autonomic function; Brain stem; Breathing rate; Respiratory sinus arrhythmia; Schizophrenia; Cardiac mortality; Psychosis; Vagal tone
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Altered amygdala activity in patients with schizophrenia can influence respiratory patterns and consequently cardiovascular parameters. Hence, we examined respiration and heart rate time series complexity as well as coupling of both signals. Electrocardiograms and respiratory signals were obtained from 25 unmedicated patients with schizophrenia and controls. Approximate entropy (ApEn) was calculated for heart and respiratory rates as well as cross-ApEn reflecting coupling of both signals. Coupling was decreased indicating diminished vagal modulation at the brain stem level. Regularity of breathing correlated with disease severity. These data might reflect a lack of inhibitory control over brainstem centers in schizophrenia. (C) 2009 Elsevier B.V. All rights reserved.
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