Archive image from page 232 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 ARTEEIAI, PRl-SSURE IN MAN. 20' ?..(TH SDP iin N\.K J 15 iz there would be no pulse oscillations of pressure in the air in the bag, except very small pulsations, caused by the end of the compressed artery beating against the side of the bag. If now the pressure is lowered very gradually, the blood will begin to work into the artery beneath the bag, (see II, Fig. 40). Von Recklinghausen pointed out that if the pressu
Archive image from page 232 of Directions for laboratory work in Directions for laboratory work in physiology for the use of medical students directionsforlab00lomb Year: 1914 ARTEEIAI, PRl-SSURE IN MAN. 20' ?..(TH SDP iin N\.K J 15 iz there would be no pulse oscillations of pressure in the air in the bag, except very small pulsations, caused by the end of the compressed artery beating against the side of the bag. If now the pressure is lowered very gradually, the blood will begin to work into the artery beneath the bag, (see II, Fig. 40). Von Recklinghausen pointed out that if the pressure in the bag falls moderately rapid- ly, there usually comes quite a sudden rise in the height of the recorded pulse beats, at the instant that the blood forces its way into the part of the artery under the bag, and when this occurs it would seem to be a good in- dication of the systolic pressure. . Criterion of Separation of the Ascending and De- scending Limbs of the Pulse Curvc. Another piece of evidence is to be found in the shape of the pulse obtained with the tambour. Erlanger states that if the record be taken on a drum moving not too slowly, at the moment that the pulse beats begin to work under the bag, the up and down strokes are to be seen to separate, and that this separation is to be taken as the criterion for the systolic pressure. II. Diastolic Presure. a. The Auscnlatory Criterion. The sudden lessening of the sounds heard over the artery, distal to compression of the bag. as the pressure in the bag falls. °, A iyviv4v,LQ':->~j;-sf ststKf? 'i Fig. 40. Diagram showing how varying pressures in the bag, by act- ing against the systoHc, diastolic, and pulse pressures, alter the tension of the wall of the artery, and consequent- ly the pulse oscillations of the air in the bag and the tambour record. A, artery; B, bag; D, diastolic pressure; S, systolic pressure; _P, pulse pressure ; I, pressure in bag is more than sys- tolic ; II, pressure in bag is less than
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