Key result
Antipsychotic-induced subjective restlessness in schizophrenia was associated with altered heart rate dynamics, including a higher LF/HF ratio and lower approximate entropy (P<0.05).
Why the study?
Is antipsychotic-induced subjective restlessness associated with altered heart rate dynamics in patients with schizophrenia?
Cross-Sectional (n=78)
Is antipsychotic-induced subjective restlessness associated with altered heart rate dynamics in patients with schizophrenia?
p-value: p=<0.05
Antipsychotic-induced subjective restlessness in schizophrenia is associated with altered heart rate dynamics, suggesting impaired autonomic neurocardiac integrity.
May indicate autonomic monitoring needs in affected patients; leaves open causal links and clinical utility.
BACKGROUND: Antipsychotic-induced subjective inner restlessness is one of the common and distressing adverse effects associated with antipsychotics; however, its underlying neurobiological basis is not well understood. We examined the relationship between antipsychotic-induced subjective inner restlessness and autonomic neurocardiac function. METHODS: Twenty-two schizophrenia patients with antipsychotic-induced subjective restlessness, 28 schizophrenia patients without antipsychotic-induced subjective restlessness, and 28 matched healthy control subjects were evaluated. Assessments of the linear and nonlinear complexity measures of heart rate dynamics were performed. Multivariate analysis of variance and correlation analysis were conducted. RESULTS: The mean interbeat (RR) interval value was significantly higher in control subjects than in patients with and without antipsychotic-induced subjective restlessness (P < 0.05). The low frequency/high frequency ratio was significantly higher in patients with antipsychotic-induced subjective restlessness than in control subjects and in patients without antipsychotic-induced subjective restlessness (P < 0.05), while the approximate entropy value was significantly lower in patients with antipsychotic-induced subjective restlessness than in control subjects and in patients without antipsychotic-induced subjective restlessness (P < 0.05). Correlation analyses controlling for psychotic symptom severity showed that the degree of antipsychotic-induced restlessness had a significant negative correlation with the value of approximate entropy (P < 0.05). CONCLUSION: The results indicate that antipsychotic-induced subjective restlessness is associated with altered heart rate dynamics parameters, particularly the nonlinear complexity measure, suggesting that it might adversely affect autonomic neurocardiac integrity. Further prospective research is necessary to elucidate the precise interrelationships and causality.
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Kim et al. (2013) conducted a cross-sectional in Schizophrenia (n=78). Antipsychotic-induced subjective restlessness vs. Schizophrenia patients without restlessness and healthy controls was evaluated on Linear and nonlinear complexity measures of heart rate dynamics (mean RR interval, LF/HF ratio, approximate entropy) (p=<0.05). Antipsychotic-induced subjective restlessness in schizophrenia was associated with altered heart rate dynamics, including a higher LF/HF ratio and lower approximate entropy (P<0.05).
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