Key result
Graded hemorrhage assesses cardiac output and circulating blood volumes in anesthetized cats.
Why the study?
The study aimed to characterize circulatory responses and identify a critical blood volume level for the onset of hypotension during graded haemorrhage in cats.
This preclinical study investigates the critical level of blood volume for the onset of hypotension in a feline model of graded haemorrhage.
Answers are grounded in this paper and cite their sources.
Feline graded haemorrhage model probes blood volume thresholds for hypotension; leaves open translation to human shock management.
Thirty-two cats, anaesthetized with chloralose and urethane, were subjected to graded haemorrhage: blood was withdrawn in stages of approximately 4 ml./kg.at 70 min.intervals until blood pressure had fallen to 40 mm.Hg.or spontaneous respiration ceased.Before haemorrhage was begun, and at 30-40 min.after each haemorrhage, the cardiac output and circulating volumes of red cells and plasma were determined in twenty-one experiments from the dilution of 32P-labelled cells and 31lIodinated albumin injected simultaneously; in eleven experiments labelled cells only were
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Groom et al. (1965) studied Haemorrhage and hypotension (n=32). Graded haemorrhage vs. Baseline (before haemorrhage) was evaluated on Cardiac output and circulating volumes of red cells and plasma. Graded haemorrhage in 32 anaesthetized cats was used to evaluate cardiac output and circulating blood volumes, though specific quantitative results are not reported in the truncated abstract.
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