Effects of Diluent Volume of a Single Dose of Epidural Bupivacaine in Parturients During the First Stage of Labor

Abstract

Analgesia lasts significantly longer following 20 mL 0.1% bupivacaine than following 10 mL 0.2% bupivacaine when given for first-stage labor pain. Four milliliters 0.5% bupivacaine results in inadequate pain relief.