Haldane's decompression model: Difference between revisions

Revision as of 21:08, 19 May 2018

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===Paul Bert===

[[Paul Bert]] (17 October 1833 – 11 November 1886) was a French physiologist graduated at Paris as doctor of medicine in 1863, and doctor of science in 1866. He was appointed professor of physiology successively at Bordeaux (1866) and the Sorbonne (1869). Paul Bert was given the nickname of "Father of Aviation Medicine" after his work, ''La Pression barometrique'' (1878), a comprehensive investigation on the physiological effects of air-pressure, which pointed out that the symptoms of [[caisson disease]] could be avoided by means of very slow decompression. However, his work did not furnish data about safe decompression rates.<ref>[https://hagstromerlibrary.ki.se/books/1537 La pression barométrique. Recherches de physiologie expérimentale. ]</ref><ref>{{cite journal | pmid = 360338 | volume=34 | issue=1 | title="La Pression barométrique": Paul Bert's hypoxia theory and its critics | journal=Respir Physiol | pages=1–28 | last1 = Kellogg | first1 = RH | doi=10.1016/0034-5687(78)90046-4| year=1978 }}</ref>

===Schrötter===

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:* For short diving periods of less than seven to eight minutes with no repetitive dive: Haldane's experiments on goats showed that sudden decompression in less than a minute after exposures up to four minutes at {{convert|75|psi|bar|abbr=on}}, equivalent to {{convert|42|m|ft}} of sea water, goats did not develop any symptoms, even when exposures were raised to six minutes in some cases. This coincides with reports at that time from the Mediterranean of skilled Greek divers, diving to {{convert|30|fathom|m}} who, should their gear become entangled on the bottom, will cut their air-pipe and line, and blow themselves up to the surface in less than a minute.{{Citation needed|date=May 2015}}

:* With dives exceeding a few minutes or brief repetitive dives: Hill and Greenwook compressed themselves to {{convert|91|psi|bar|abbr=on}}, equivalent to {{convert|53|m}} of sea water, a very high pressure and risky experiment, and had bends after decompression.{{Citation needed|date=May 2015}} [[File:From Haldane's Book - N2 Saturation for different body tissues.jpg|thumb |The saturation curves of Hill and Greenwook's experiment for parts of the body]]The saturation curves of their experiment for parts of the body were published.

[[File:Haldane - Bends of fore-leg in a goat.jpg|thumb|220px|right|One of Haldane's bent goats. Note the bend in the left foreleg.<ref>{{Cite journal |date=June 1908 |journal=The Journal of Hygiene, Vol. |volume=8, No.|pages=342–443 |number=3|pmid=20474365 (Jun|pmc=2167126 |last1=Boycott |first1=A. 1908),E. |title=The Prevention of Compressed-air Illness |last2=Damant pp|first2=G. 342–443C. |last3=Haldane |first3=J. S. }}</ref>]]

* Experiments continued on goats, and symptoms observed on goats were noted each time on appropriated schedule to record the presence of symptoms not the presence of bubbles:

:* Bends, the commonest symptom. The limb, most commonly the fore-leg.