On the relative temperature of arterial and venous blood / by W.S. Savory.

  • Savory, W. S. (William Scovell)
Date:
[©1857?]
Catalogue details

Licence: Public Domain Mark

Credit: On the relative temperature of arterial and venous blood / by W.S. Savory. Source: Wellcome Collection.

Provider: This material has been provided by The University of Glasgow Library. The original may be consulted at The University of Glasgow Library.

    15/28 (page 13)
    trate the effect which a state of asphyxia has upon the relative temperature of arterial and venous blood, I select as an example the following: — Experiment 4. —A dog, rendered insensible by chlo- roform, was strangled by a cord drawn tightly round the neck. The heart was immediately exposed by the removal of a portion of the anterior wall of the thorax. A faint tremulous action was still visible. The right ventricle was distended; it.was punctured, and a thermometer was intro- duced. It rose to 101-1-°. The puncture and the -escape of a small quantity of blood \vere followed by much more decided and rearular contractions of the ventricles. Another thermometer, introduced in a similar manner into the left ventricle, rose to 101°. The blood which escaped from this ventricle was venous in character. In the course of one or two minutes both began to fall, but the right was rather in advance. Temperature of room, 60°. Here, as in the experiments by Liebig and others, by pre- venting the change of the blood from venous to arterial in the lungs, the difference of temperature naturally existing in the ventricles is actually reversed. The loss of temperature observed on the left side in this experiment would doubt- less have been more considerable if the means adopted to produce asphyxia had not checked to some extent the eva- poration of fluid, and the consequent consumption of heat from the blood at the lungs, which occurs when the air is constantly renewed. The fifth experiment was designed to show more fully the relation which exists between the natural change which the blood undergoes in the lungs and the elevation of its tem- perature. It shows that, when deprived of the action of oxygen, notwithstanding the pulmonary circulation continues and its other conditions are fulfilled, there is a loss instead of an increase of temperature. Experiment 5. — A large dog, having been rendered insensible by chloroform, one thermometer was introduced through the arteria sacra media into the abdominal aorta at