Blood ptosis : a test of vasomotor efficiency / by C. Ward Crampton.

  • C. Ward Crampton
Date:
[1913?]
Catalogue details

Licence: Public Domain Mark

Credit: Blood ptosis : a test of vasomotor efficiency / by C. Ward Crampton. Source: Wellcome Collection.

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    arrive at a correct estimation of the weakness. An- other explanation maintains that the increased heart rate does not raise the pressure but merely reveals it, for the heart furnished with a lessened charge ot blood is able to send it into the arteries more quickly. From my own observation it is clear that a single patient will show-in successive readings a variation of blood pressure and heart rate which compensate each other, while the consideration of both will re- veal no change in vasotone efficiency. The balancing of these two is a matter of some importance. The usual range of the systolic pres- sure is from +10 to —10 of the heart rate increase from 0 to 44, as observed from records of a large number of cases. Upon a statistical balancing of these two series of frequencies, and assigning equal percentages to equal ranges, the following scale is constructed. PERCENTAGE SCALE, Vasomotor Tone. BLoop PRESSURE. Heart rate 7-7 Increase_—___, a= Decrease —~ increase. +10 +8 +6 +4 +2 0 —2—4 —6 —8& —I0 OrGaa se 100 -95 90 85 80 75 70 65 60 55 50 Bhage e lois coc 95 90 8 8 75 70 65 60 55 50 45 OMOsT Sie 90 85 80 75 70 65 60 55 50 45 40 L3atOstO nee 85 &8oO 75 70.65 60 55 50 45. 40uN35 Tet OecO nee 80 75 70 65 60 55 50 45 940.035 900 BT tO, 2aenoe 75 70 65. 60°55 50° 45 40) 25 — comes eh atOReon aie 70 65 60 55 50 45 40 35 30 25 20 BOLO 2h ewe 65 “60° 55 <50) 45740 350.205 2520 aes Batt RO eee 60. 55° 50° 45 40° 35. 30 25 920 si5eua 2B atOsAO ee. 55. 50° 45 40 85 30°25 20° 15 210me5 AletOelA eee 50 45 40 35 30 25 20 I5 10 5 oO NotE.—In case of increase in pressure higher than +10 add 5 per cent. to the +10 column for each 2 millimetres in excess of Io. This scale provides a convenient and intelligible method of recording and reporting cases and per- mits a numerical statement of the function in ques- tion. Its 100 mark indicates a perfectly efficient working of the vasomotor system under test, the zero is approximately the point where the average person is unable to maintain the erect posture.
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