A Randomized, Double-Blind, Trial Comparing Epinephrine Versus Phenylephrine as a Vasoconstrictor in Regional Anesthesia for Upper Extremity Surgery

The study involves research, the purpose of which is to compare three different drug mixtures (Epinephrine, Phenylephrine 25 µg, or Phenylephrine 50 µg). Specifically, how long each medicine lasts will be studied.

Inclusion Criteria:

• Shoulder surgery with regional anesthesia

Exclusion Criteria:

• Shoulder surgery with general anesthesia unhealthy