Pulse Volume Changes Research Articles

Vascular profile screening tests: a new approach to the detection of vascular disease.

AbstractBy means of a four‐electrode plethysmograph, blood pulse volume changes were determined over the head, neck torso and extremities in healthy subjects and in patients with vascular disease in these areas. The amplitudes of the recorded pulses, plotted bilaterally from the central line of a body silhouette, provided an outline or profile of the vascular supply. In healthy subjects the characteristic outline was symmetrical, but in patients with vascular disease it was asymmetrical in the specific areas involved.Such qualitative identification of vascular abnormalities according to recognized patterns decreases the time required to evaluate numerical data, and indicates the vascular areas in which there should be more quantitative assessment. This screening procedure is useful for the detection of early vascular disease and, when combined with quantitative evaluation, for a guide in the therapeutic management of older patients with established vascular disease.

Local vascular and thermal changes that accompany electric shock.

ABSTRACTA series of experiments was conducted to determine whether any physiological changes accompany the previously observed drop in impedance of the electrodeskin circuit during the administration of electric shock. Two concentric shock electrodes were modified by the addition of devices to measure the local temperature, blood volume, and blood pulse volume changes occurring directly under the electrode. Subjects were given a series of shocks through one of these electrodes, but not the other, while the physiological measures were recorded at both sites.No significant differences in temperature and blood volume measures occurred between shocked and unshocked electrodes. However, directly correlated with the drastic drop in impedance of the shocked circuit was a marked increase in blood pulse volume, inferred to be a manifestation of the axon reflex. The two related effects were shown to be highly localized at or near the shocked electrode, and also to be characteristic only of the passage of current through electrode‐skin junctions.

Impedance plethysmography in study of peripheral circulation.

DIGITAL pulse volume studies have proved of great value in the study of the peripheral circulation. The methods most commonly used have the disadvantage that they necessitate placing the digit in an airtight or watertight cylindrical compartment. In most of them the tracings are recorded on photographic paper, and analysis of data must wait until the film is developed. The present study is concerned with a method of recording pulse volume changes by alterations in electrical impedance of the digit under study. This method requires only the attachment of electrodes to the digit and utilizes a direct-writing recorder. The biophysical background of tissue impedance and impedance plethysmography has been summarized extensively by Nyboer and his associates.1Impedance plethysmograms are recordings of variations in the electrical resistance and reactance of segments of the body to intermediate and high frequency alternating currents. The impedance pulse tracings reflect the mechanical pulse volume

Studies of peripheral vascular phenomena: IV. The effect of artificial fever on the pulse volume changes of the finger: Johnson, Carl A., Am. J. M. Sc. 190: 485, 1935

Studies of peripheral vascular phenomena: IV. The effect of artificial fever on the pulse volume changes of the finger: Johnson, Carl A., Am. J. M. Sc. 190: 485, 1935