Compensatory phenomena in the distribution of the blood during stimulation of the splanchnic nerve / by D.J. Edwards.

  • Edwards, Dayton James, 1882-
Date:
[1914]
Catalogue details

Licence: Public Domain Mark

Credit: Compensatory phenomena in the distribution of the blood during stimulation of the splanchnic nerve / by D.J. Edwards. Source: Wellcome Collection.

Provider: This material has been provided by the Augustus C. Long Health Sciences Library at Columbia University and Columbia University Libraries/Information Services, through the Medical Heritage Library. The original may be consulted at the the Augustus C. Long Health Sciences Library at Columbia University and Columbia University.

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    of about 68 cc. in a minute, it is obvious that the head circuit alone is capable of compensating for more than one-half of this quantity. The average flow in these experiments during stimulation of the splanchnic nerve was 2.26 cc. per second, and the average systemic pressure for the same period, obtained by taking the mean pressure for each phase of the stromuhr, was 107 mm. Hg. These values give a volume of flow per 100 mm. Hg pressure, of 2.11 cc. per second. If we now compare this with the normal flow of 2.23 cc. per second, obtained in these experiments, it is evident that there is a greater volume of flow per second with Fig. 1 Record OF THE AccelerjVted Blood-Flow IN THE External Jugular Vein During Stimulation of the L. Splanchnic Nerve 1, Time in seconds; 3, blood-pressure in femoral artery (mercury manometer); 3, stromuhr; 4, blood-pressure in jugular vein (membrane manometer) 5, zero blood pressure; 8 to 7, period of stimulation. the high systemic blood-pressure, yet in proportion to the head of pressure there is a diminished efficiency. The increase in the flow bears a close relation to the corresponding changes in blood-pressure, as is illustrated in figure 1. There is first a short latent period which is followed by a gradually increasing flow. The maximum flow is usually attained at about the time of highest systemic blood-pressure. If the period of stimula- tion is short, e.g., ten to fifteen seconds, the maximum flow does not appear until after the cessation of the stimulation.
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