Comparative Study of Heart Rate Variability in Patients with Schizophrenia, Bipolar Disorder, Post-traumatic Stress Disorder, or Major Depressive Disorder.
OBJECTIVE
Heart rate variability (HRV) changes as a function of psychiatric illness. This study aimed to evaluate HRV among patients with various psychiatric disorders.


METHODS
The present study recruited patients with schizophrenia (n=35), bipolar disorder (n=41), post-traumatic stress disorder (PTSD; n=34), or major depressive disorder (n=34) as well as healthy controls (n=27). The time-domain analysis (the standard deviation of all RR intervals [SDNN] and the square root of the mean squared differences of successive normal sinus intervals [RMSSD]), the frequency-domain analysis (very low frequency, low frequency [LF], high frequency [HF], and total power [TP]), and a non-linear complexity measure the approximate entropy were computed.


RESULTS
SDNN and HF were significantly reduced in patients with schizophrenia compared with healthy controls. SDNN, RMSSD, TP, LF, and HF were significantly reduced in bipolar patients compared with healthy controls. HF was significantly reduced in PTSD patients compared with healthy controls.


CONCLUSIONS
Our findings indicate that HRV is not sufficiently powerful to discriminate among various psychiatric illnesses. However, our results suggest that HRV, particularly HF, could be used as a tool for discriminating between psychiatric patients and healthy controls.
Clinical Emotion and Cognition Research Laboratory, Inje University Ilsan Paik Hospital, Goyang, Korea.
Eunok
E
Moon
Clinical Emotion and Cognition Research Laboratory, Inje University Ilsan Paik Hospital, Goyang, Korea. ; Department of Psychiatry, Inje University Ilsan Paik Hospital, Goyang, Korea.
Seung-Hwan
SH
Lee
Department of Psychiatry, Inje University Ilsan Paik Hospital, Goyang, Korea.
Do-Hyung
DH
Kim
Department of Psychiatry, Inje University Ilsan Paik Hospital, Goyang, Korea.
Boram
B
Hwang
Bipolar disorder; Heart rate variability; Major depressive disorder; Post traumatic stress disorder; Schizophrenia