Comparing the Effects of Arginine Vasopressin and Norepinephrine on Blood Vessel Constriction
Author Information
Author(s): Barbara E Friesenecker, Amy G Tsai, Judith Martini, Hanno Ulmer, Volker Wenzel, Walter R Hasibeder, Marcos Intaglietta, Martin W Dünser
Primary Institution: Innsbruck Medical University
Hypothesis
There are no differences in the arteriolar vasoconstrictive response between AVP and NE.
Conclusion
AVP causes significantly stronger vasoconstriction in large arterioles compared to NE under physiological conditions.
Supporting Evidence
- AVP caused a 49% reduction in arteriolar diameter compared to 31% for NE.
- AVP resulted in a 73% reduction in cross-sectional area versus 49% for NE.
- Blood flow in A0 arterioles decreased by 80% with AVP compared to 62% with NE.
Takeaway
This study found that a hormone called AVP makes blood vessels tighten more than another hormone called NE, which helps explain why AVP is very effective in raising blood pressure.
Methodology
The study used a hamster model to compare the effects of AVP and NE on arteriolar constriction using intravital microscopy.
Potential Biases
Potential bias due to the animal model and the specific conditions under which the study was conducted.
Limitations
The study was conducted in a controlled animal model, which may not fully replicate human physiological conditions, and the effects of sedation on microvascular blood flow were not assessed.
Participant Demographics
11 male golden Syrian hamsters, weighing 60 to 85 g.
Statistical Information
P-Value
0.002
Statistical Significance
p<0.01
Digital Object Identifier (DOI)
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