The biophysical basis and clinical applications of rheoencephalography

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Abstract
Theoretical analysis suggests that REG [rheoencephalography] is a quantitative method which reliably reproduces changes in cranial blood volume. The effect of blood flow in REG is negligible. A standardized, reproducible tracing procedure is presented as a standard method for future REG studies. Individual extra- and intracranial arterial REG contributions are demonstrated. These components permit the quantitative evaluation of the patient''s cranial circulation. The extracranial components usefully represent the external carotid arteries. Conclusions from 136 normal and abnormal tracings are presented. REG diagnoses were correct in 95% of the patients who have received definitive studies. Incidences and patterns of arterial involvement and collateral compensation are presented and discussed. The potential value of REG screening of normal populations for cerebrovascular anomalies and early disease is demonstrated. Several previously unreported REG syndromes are described. Difficulties in REG diagnosis using previously reported criteria are elucidated.

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