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Journal of the Korean Academy of Rehabilitation Medicine 1998;22(4):778-783.
Assessment of Autonomic Function in Stroke Patients by Power Spectral Analysis of Heart Rate Variability.
Chon, Joong Son , Chun, Sae Il , Park, Seung Hyun , Ahn, Juhn , Baek, Soh Young , Kang, Youn Joo , Doh, Won Su , Jeong, Kee Sam , Shin, Kun Soo , Lee, Myoung Ho
1Department of Rehabilitation Medicine, Yonsei University College of Medicine.
2Institute of Traditional Medicine, Yonsei University College of Medicine.
3Department of Electrical Engineering, Yonsei University College of Engineering.
4Institute of Medical Instruments Technology, Yonsei University.
뇌졸중 환자에서 심박변동의 Power Spectrum 분석에 의한 자율신경기능 평가
전중선, 전세일, 박승현, 안준, 백소영, 강윤주, 도원수, 정기삼1, 신근수2, 이명호1
연세대학교 의과대학 재활의학교실, 연세 동서의학 연구소, 1연세대학교 공과대학 전기공학과 및 2연세대학교 의료기기 기술연구소
Abstract

Objective
To evaluate the effects of orthostatic stress with a head-up tilt on the autonomic nervous system and to determine how a cerebral stroke influences the cardiac autonomic function, using the power spectral analysis(PSA) of heart rate variability(HRV).


Method
We studied 11 stroke patients with a left hemiplegia and 14 patients with a right hemiplegia. Their hemispheric brain lesions were confirmed by the MRI. The ECG and respiration signals were recorded at the tilt angle of 0o and 70o for 5 minutes under the condition of frequency controlled respirtaion(0.25 Hz). Data were compared with the age- and sex-matched 12 healthy controls.

Result: In a control group, the normalized high frequency power showed a significant decrease during the head-up tilt(p<0.05), whereas the normalized low frequency power showed a significant increase(p<0.05). But for the left and right hemiplegia groups, there were no significant changes of normalized high and low frequency power under the orthostatic stress(p>0.05). Compared with the right hemiplegia and control groups, the left hemiplegia group was associated more with a reduced low and high frequency power and showed no significant changes under the orthostatic stress.


Conclusion
PSA of HRV can identify the reduced cardiac autonomic activity in stroke patients, with a greater reduction in the left hemiplegia group than in the right hemiplegia group, which may cause a high risk of cardiac arrhythmias and sudden death.

Key Words: Stroke, Power spectral analysis, Heart rate variability, Cardiac autonomic activity


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