J Clin Monit Comput - Analysis of heart rate variability during auditory stimulation periods in patients with schizophrenia.

Tópicos

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Resumo

The vulnerability-stress model is a hypothesis for symptom development in schizophrenia patients who are generally characterized by cardiac autonomic dysfunction. Therefore, measures of heart rate variability (HRV) have been widely used in schizophrenics for assessing altered cardiac autonomic regulations. The goal of this study was to analyze HRV of schizophrenia patients and healthy control subjects with exposure to auditory stimuli. More specifically, this study examines whether schizophrenia patients may exhibit distinctive time and frequency domain parameters of HRV from control subjects during at rest and auditory stimulation periods. Photoplethysmographic signals were used in the analysis of HRV. Nineteen schizophrenic patients and twenty healthy control subjects were examined during rest periods, while exposed to periods of white noise (WN) and relaxing music. Results indicate that HRV in patients was lower than that of control subjects indicating autonomic dysfunction throughout the entire experiment. In comparison with control subjects, patients with schizophrenia exhibited lower high-frequency power and a higher low-frequency to high-frequency ratio. Moreover, while WN stimulus decreased parasympathetic activity in healthy subjects, no significant changes in heart rate and frequency-domain HRV parameters were observed between the auditory stimulation and rest periods in schizophrenia patients. We can conclude that HRV can be used as a sensitive index of emotion-related sympathetic activity in schizophrenia patients.

Resumo Limpo

vulnerabilitystress model hypothesi symptom develop schizophrenia patient general character cardiac autonom dysfunct therefor measur heart rate variabl hrv wide use schizophren assess alter cardiac autonom regul goal studi analyz hrv schizophrenia patient healthi control subject exposur auditori stimuli specif studi examin whether schizophrenia patient may exhibit distinct time frequenc domain paramet hrv control subject rest auditori stimul period photoplethysmograph signal use analysi hrv nineteen schizophren patient twenti healthi control subject examin rest period expos period white nois wn relax music result indic hrv patient lower control subject indic autonom dysfunct throughout entir experi comparison control subject patient schizophrenia exhibit lower highfrequ power higher lowfrequ highfrequ ratio moreov wn stimulus decreas parasympathet activ healthi subject signific chang heart rate frequencydomain hrv paramet observ auditori stimul rest period schizophrenia patient can conclud hrv can use sensit index emotionrel sympathet activ schizophrenia patient

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