Monitoring of parameters of central and peripheral hemodynamics is an important problem of clinical diagnosis. This problem is presently being solved using ultrasonic doppleroscopy (echography). Ultrasonic dopplero-scopy is a safe and informative diagnostic method. In some cases (bone system diseases, diseases of lungs, gastrointestinal tract, brain) this method fails or is severely limited. In these cases methods of impedance plethys-mography are used. Methods of impedance plethysmo-graphy (rheography) are based on dependence of tissue resistance on tissue filling with blood. During detection of a rheogram the patient's body is connected to a generator of alternating current (frequency, 50-100 kHz; current amplitude, 10 uA).
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