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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1896 Excerpt: ...divided by a crucial incision when the animal is in the feet-down position, the blood pressure will fall largely in consequence of the withdrawal of mechanical support from the splanchnic vessels. I was interested in finding an observation recorded by Stephen Hales in his classical researches on blood pressure: "When the blood has subsided a little in the tubes which were fixed to the arteries of these dogs, it would, as in the horse's, rise on a sudden considerably on deep sighing, as also on pressing the dogs' bellies hard with the hand the blood would immediately rise about six inches, and subside as much on taking off the hand; and it was the same on several repetitions." Roy and Adami found that compression of the abdomen increased the quantity of blood thrown out by the heart, to the extent of 26 per cent, (or even more) during the period of compression. Excitation of the peripheral end of the divided spinal cord, of the splanchnic nerves, asphyxia or injection of suprarenal extract will equally well restore the blood pressure in the feet-down position by constricting the splanchnic area. In one experiment I compressed the abdomen when the animal was in the later stage of asphyxia. The bandage was applied at the point when the pressure was just beginning to fall, and the result was an immediate rise of pressure and great acceleration of the heart, produced by the sudden access of a large quantity of blood. This was followed by sudden failure of the heart and the fall of the blood pressure to zero. On supplying it with artificial respiration, the animal rapidly recovered, and the effect of rebandaging the abdomen after recovery was very slight. (For this and other tracings see Journal of Physiology, 1895.) This experiment shows the danger of ...
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