On the influence of the position of the body on the position of the heart and on intracardiac pressure / by C.J. Bond.

  • Charles John Bond
Date:
[1885]
Catalogue details

Licence: Public Domain Mark

Credit: On the influence of the position of the body on the position of the heart and on intracardiac pressure / by C.J. Bond. Source: Wellcome Collection.

Provider: This material has been provided by The Royal College of Surgeons of England. The original may be consulted at The Royal College of Surgeons of England.

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    [2] Tracing No. 2. Tracing >»o. 3. Tracing No 1.—From right to left, oesophageal tampon. Anaesthetised sheep. Shows the curves due (1) to oesophageal contraction (the tall square topped waves); (2) the respiratory curve ; and (3) the smaller and frequent cardiac oscillations on the summits of the larger respiratory waves. Tracing No. 2.—From left to right. Tampon passed down writer’s oesophagus. Shows oesophageal contractions, respiratory movements, and cardiac curves. The latter more marked during expiration, and during inversion, and on back ; absent in sitting and prone positions. Tracing No. 3.—From right to left Shows intra-auricular pressure-curve; falling during and after nrone position, gradually rising in supine and inverted positions, and falling again when head and thorax are raised. quently; and, thirdly, on this respiratory curve are to be seen a series of small waves, due to the cardiac beats ; it is to these latter, and to their variations, that attention will now specially be directed. These cardiac waves are best shown in Tracing No. II ; here the tampon was passed down my own oesophagus, without anaesthesia ; and, after some practice, I was able to retain it, without any attempt at vomiting, for a quarter of an hour at a time. In following the trace from left to right, we notice, first, that (un- like the case of the anaesthetised animal) the respiratory curve is