AUTHOR=Visočnik Darja , Žvan Bojana , Zaletel Marjan , Zupan Matija 

TITLE=αCGRP-Induced Changes in Cerebral and Systemic Circulation; A TCD Study

JOURNAL=Frontiers in Neurology

VOLUME=11

YEAR=2020

URL=https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2020.578103

DOI=10.3389/fneur.2020.578103

ISSN=1664-2295

ABSTRACT=<p>It is known that perivascular application of CGRP induces cerebral vasodilatation. However, it is unclear whether intravenous alfa CGRP (αCGRP) induces changes in cerebral and systemic hemodynamics. Therefore, we studied the influence of an αCGRP intravenous infusion at a rate of 1.5 mcg/min in 20 min on mean arterial velocity in the middle cerebral artery (vm MCA) and in the posterior cerebral artery (vm PCA) in twenty healthy subjects using transcranial Doppler (TCD). We found out that αCGRP decreased vm MCA (<italic>p</italic> &lt; 0.001), vm PCA (<italic>p</italic> &lt; 0.001), mean arterial pressure (MAP) (<italic>p</italic> &lt; 0.001) and end-tidal CO<sub>2</sub> (Et-CO<sub>2</sub>) (<italic>p</italic> = 0.030). The heart rate (HR) increased during αCGRP infusion (<italic>p</italic> &lt; 0.001). In addition, we found a positive relationship between Et-CO<sub>2</sub> and vm MCA (<italic>p</italic> = 0.001) as well as vm PCA (<italic>p</italic> = 0.043). In our view, αCGRP induces changes in cerebral and systemic circulation in healthy volunteers. It might cause vasodilatation of MCA and PCA and a compensatory decrease of Et-CO<sub>2</sub> to αCGRP related hemodynamic changes.</p>