Little RA. Resistance to post-traumatic fluid loss at different ages.
BRITISH JOURNAL OF EXPERIMENTAL PATHOLOGY 1972;
53:341-6. [PMID:
5070119 PMCID:
PMC2072414]
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Abstract
The ability to withstand post-traumatic fluid loss in a thermoneutral environment has been studied in the rabbit during the first 3 weeks of life.
The LD50 period of bilateral hind-limb ischaemia, calculated by probit analysis, fell from birth to the 10th day of life and then returned to the 1-2 day level by the 22nd day.
The difficulties of defining the acute injury to the animal are discussed and it is concluded that the fluid loss from the circulation expressed as a fraction of the plasma volume or total body water is the most precise. To compare the resistance of different age groups the fluid loss required to kill one half of a group of rabbits (i.e. the fluid loss following an LD50 period of ischaemia) was calculated at each age studied. When the changes in body composition with age had been taken into account the 1-2 day-old rabbit was more resistant to post-traumatic fluid loss in a thermoneutral environment than the older animal. The possible clinical significance of these results is briefly discussed.
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