Handbook of General Therapeutics Volume 2

Handbook of General Therapeutics Volume 2

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This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1885 edition. Excerpt: ...increase of pressure in the pulmonary artery and oedema of the lungs appeared. Welch, fully perceiving this, points out that the conditions under which he could produce pulmonary oedema differ very considerably from those which have to do with its production in man. He, however, maintains firmly that the oedema produced in his experiments results from stagnation, and asks accordingly whether there may not be other factors which can produce stagnation of the blood in the lungs and consequent oedema. Welch answers the question thus: In paralysis of the left side of the heart, with a permanently suflicient activity of the right side of the heart during the paralysis, an accumulation of blood in the lungs may ensue, which is naturally suflicient to set up passive oedema in this organ. To speak more definitely, a relative disproportion between the work of the left ventricle and that of the right signifies that, with the same continuous resistance, the left ventricle cannot expel the same quantity of blood in the same time as the right. Welch thinks that, in these circumstances, such a large quantity of blood must be forced out of the right ventricle into the pulmonary arteries that an accumulation of it takes place in the capillaries and veins of the lungs, until the quantity flowing out through the pulmonary veins has become the same as that impelled into the pulmonary arteries. It must be premised that the blood conveyed to the right side of the heart is not less than before. ' Experimentally, Welch produced pulmonary oedema in rabbits by mechanical stimulation--viz. squeezing--of the left ventricle. The pressure in the carotid sank considerably in consequence. The pressure in the pulmonary artery was not measured; there is found in the...show more

Product details

  • Paperback | 182 pages
  • 189 x 246 x 10mm | 336g
  • Rarebooksclub.com
  • United States
  • English
  • black & white illustrations
  • 1236920937
  • 9781236920935