The purpose of adding a small amount of adrenaline to local anesthetics

The purpose of adding a small amount of adrenaline to local anesthetics is that adrenaline has the effect of constricting blood vessels. Adding a small amount of adrenaline to anesthetics can infiltrate subcutaneous and surrounding tissues during local anesthesia, which can make blood vessels contract. In this way, bleeding from surgical wounds can be reduced during surgery, making vision clearer and conducive to surgical operations. However, adrenaline must be added in an appropriate amount, not in excess, because after adrenaline is excessive, it will cause excessive contraction of blood vessels, affect blood circulation at the wound, and affect wound healing. Moreover, it is not recommended to add a speed limit for finger (toe) surgery, because this may cause finger (toe) necrosis.