(Stroke. 1996;27:2059-2063.)
© 1996 American Heart Association, Inc.
Articles |
Abnormal Heart Rate Variability as a Manifestation of Autonomic Dysfunction in Hemispheric Brain Infarction
the Departments of Neurology (J.T.K., K.A.S., V.V.M.) and Medicine, Division of Cardiology (H.V.H.), University of Oulu, and Department of Neurological Rehabilitation, Deaconess Institute of Oulu (J.T.K.) (Finland).
Correspondence to Juha Korpelainen, MD, Department of Neurology, University of Oulu, Kajaanintie 50 A, FIN-90220 Oulu, Finland.
Background and Purpose Abnormal heart rate variability is related to prognostically unfavorable ventricular arrhythmias and sudden arrhythmic death in coronary artery disease. Short-term electrocardiographic (ECG) recordings have shown similar abnormalities of heart rate variability in patients with acute stroke. However, there is no information regarding the clinical significance of these abnormalities and of heart rate variability in long-term ECG recordings in stroke.
Methods In this prospective study, we analyzed the time domain and frequency domain measures of heart rate variability from 24-hour ECG recordings in 31 consecutive patients with hemispheric brain infarction in the acute phase and at 1 and 6 months after the infarction and in 31 age- and sex-matched healthy control subjects.
Results All the measured components of heart rate variability, ie, standard deviation of RR intervals (P<.001), total power (P<.0001), very-low-frequency power (P<.0001), low-frequency power (P<.001), and high-frequency power (P<.05), were significantly lower than those of the control subjects in both the acute phase and 1 and 6 months later. Impaired heart rate variability correlated with the severity of neurological deficits and disability. In five patients with increased intracranial pressure due to large brain infarction, no relevant spectral components were found.
Conclusions Hemispheric brain infarction seems to cause significant long-lasting damage to the cardiovascular autonomic regulatory system manifested as abnormalities of heart rate variability. Distorted heart rate variability in the acute phase of stroke may be prognostically unfavorable.
Key Words: autonomic nervous system • cerebral infarction • heart rate • spectrum analysis
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