Effects of Erector Spinae Plane Block Method Used in Pain Management in Heart Surgery on Vascular Diameters

One researcher will record the artery images as explained in the protocol and two researchers will measure the radius and area of those vessels separately. Researchers who are measuring the radius and area of vessels won't know whether those images belong to pre or post- ESP block. The results two researchers measure will be compared statistically and if there are no statistically significant differences, the mean value of their separate recordings will be taken into account for the statistical analysis.