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. 1979 Nov;296:267–275. doi: 10.1113/jphysiol.1979.sp013004

The role of vasopressin in blood pressure regulation immediately following acute haemorrhage in the rat

J F Laycock 1, W Penn 1, D G Shirley 1, S J Walter 1
PMCID: PMC1279077  PMID: 529092

Abstract

1. The possible pressor effect of vasopressin immediately after acute haemorrhage has been studied using anaesthetized Brattleboro rats with diabetes insipidus and rats of the Long Evans parent strain.

2. A blood loss of 0·5% of the body weight caused a significant decrease in mean arterial blood pressure, measured 10 min later, in Brattleboro rats, whereas this degree of haemorrhage was non-hypotensive in the control Long Evans rats. Following subsequent blood losses (each of 0·5% of the body weight), mean arterial blood pressure in Brattleboro rats was always significantly lower than in Long Evans rats.

3. While no antidiuretic activity was at any time found in the plasma of Brattleboro rats, haemorrhages greater than 1% of the body weight were associated with marked increases in plasma arginine vasopressin (AVP) of Long Evans rats.

4. When Brattleboro and Long Evans rats were subjected to a single haemorrhage of 2% of the body weight, the immediate decrease in arterial blood pressure was similar in the two groups. However, 5 and 10 min after the haemorrhage the arterial blood pressure was significantly higher in the Long Evans rats. When vasopressin was infused into Brattleboro rats so that plasma levels of the hormone approached those found in Long Evans rats, the mean arterial blood pressure 0, 5 and 10 min after haemorrhage was similar to that in the Long Evans animals.

5. It is concluded that in the anaesthetized rat, vasopressin plays an important role in the regulation of arterial blood pressure during the period immediately following acute haemorrhage.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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