The effects of hypotension and hypovolaemia on the liberation of vasopressin during haemorrhage in the unanaesthetized monkey (Macaca Mulatta)

Summary

Using unanaesthetized monkeys, experiments were performed to examine the effects of haemorrhage on the liberation of arginine vasopressin (AVP).

Haemorrhages of 10%, 15% or 20% total blood volume were performed via a catheter with its tip in the abdominal vena cava. A catheter in the left internal jugular vein was used for blood sampling. Arterial blood pressure was monitored via a catheter whose tip rested in an iliac artery. The monkeys showed no signs of discomfort from this catheterisation. Blood samples for AVP assay were taken at different times from 0–90 min after the end of the haemorrhage. At the end of the experiment, blood removed was reinfused.

Results show that haemorrhage resulted in liberation of AVP, but only if there was a fall in arterial blood pressure. AVP release occured more readily as the total volume of blood withdrawn increased, but the absolute rise in hormone concentration was not related to the total volume of blood withdrawn. However, comparing the area under the curve of mean arterial blood pressure with that for AVP concentration showed the two to have a significant exponential relationship.

It is concluded that, as in other species, haemorrhage is a potent stimulus for AVP liberation in the monkey. However, in contrast to some other species, the fall in arterial pressure seems to be the prime stimulus rather than hypovolemia per se.

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Arnauld, E., Czernichow, P., Fumoux, F. et al. The effects of hypotension and hypovolaemia on the liberation of vasopressin during haemorrhage in the unanaesthetized monkey (Macaca Mulatta). Pflugers Arch. 371, 193–200 (1977). https://doi.org/10.1007/BF00586258

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Key words

  • Haemorrhage
  • Vasopressin