Brown, Arthur E.; Learner, Norman
April 1957
Angiology;Apr1957, Vol. 8 Issue 2, p109
Academic Journal
Using Burch's plethysmograph and venous occlusive pressure, 706 blood flow determinations and 849 min. of continuous slow recording have been obtained in the fingers and toes of 40 normal subjects and patients with various types of cardiac and/or peripheral vascular disease.4 A new method of obtaining and measuring blood flow has been described. This involves the accurate timing within the pulse cycle of both the standardization and the venous occlusive pressure. It has been suggested that this point within the cycle should be at the junction of the catacrotic and the following anacrotic limb of the pulse curve. In addition, ‘systolic’ and ‘cycle’ flows have been determined in every case. It is felt that with this new method, definitely narrower ranges of normals for various age groups could be set up, and that more accurate and more easily duplicated flow figures are obtained. The older age group will have a wider range of values depending on collateral circulation. The younger age group should be sedated if organic disease is suspected. The need for rigidly controlled conditions is again emphasized. With this method for the determination of blood flow of the fingers, the cuff artifact is, in the vast majority of subjects, insignificant. However, in the case of the toes, one should routinely determine the cuff artifact by proximal arterial occlusion before applying venous occlusion. In any study of blood flows, note should be made not only of actual flow figures but also of the pulse volume, the α and β waves, the total volume increase, and the time required to attain this volume increase.


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