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Plasma norepinephrine concentrations during resuscitation in the dog
L P Huyghens1, P A Calle, E J Moerman
1Department of Critical Care Medicine, University of Brussels (VUB), Belgium.
The American Journal of Emergency Medicine
|September 1, 1991
Summary
During cardiopulmonary resuscitation, adrenal glands significantly increase norepinephrine levels, primarily through direct release. Epinephrine
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
Background:
- Norepinephrine is crucial during cardiopulmonary resuscitation (CPR).
- The adrenal glands' role in elevating plasma norepinephrine during CPR is not fully understood.
- Epinephrine's potential to facilitate norepinephrine release via presynaptic receptors requires investigation.
Purpose of the Study:
- To determine if adrenal glands contribute to increased plasma norepinephrine during CPR.
- To investigate the mechanisms of this contribution: direct norepinephrine release or epinephrine-mediated facilitation.
Main Methods:
- Experiments conducted on adrenalectomized and sham-operated dogs.
- Measurements of plasma norepinephrine concentrations during cardiopulmonary arrest and basic life support (BLS).
- Administration of epinephrine infusions in adrenalectomized dogs during BLS.
Main Results:
- Adrenalectomized dogs showed a significantly smaller increase in plasma norepinephrine during BLS compared to sham-operated dogs.
- Epinephrine infusion in adrenalectomized dogs did not affect plasma norepinephrine levels.
- The primary source of increased plasma norepinephrine during BLS in dogs appears to be the adrenal medulla.
Conclusions:
- The adrenal medulla is the main source of increased plasma norepinephrine during basic life support in dogs.
- Presynaptic facilitation of norepinephrine release by epinephrine seems to play a minor role.
- Further research with higher epinephrine doses is needed to definitively rule out presynaptic effects.