A critical evaluation of rheoencephalography in control subjects and in proven cases of cerebrovascular disease

Abstract

When an alternating current passes through a part of the body, modulated changes of impedance occur due to the pulsatile flow of blood, and the possibility of correlating such changes with modifications of the peripheral circulation (Mann, 1937) stimulated the development of the technique. Several modifications of the technique have been used for studies of peripheral circulation (Nyboer, 1944; Holzer and Polzer, 1945) in various parts of the body. The principles and application were lately summarized in Nyboer's monograph (1959).