Serratus Plane Versus Paravertebral Nerve Blocks for Breast Surgery

A single-injection serratus plane block will be administered using ropivacaine 0.5% with epinephrine 1:200,000-400,000 (20 mL of local anesthetic for unilateral surgery; 16 mL of local anesthetic each side for bilateral surgery).

Single injection paravertebral blocks will be administered using ropivacaine 0.5% with epinephrine 1:200,000-400,000 (20 mL for unilateral surgery; 16 mL each side for bilateral surgery). For paravertebral blocks without axillary involvement, this will be at the T3 and T5 levels. For paravertebral blocks with axillary involvement, this will be at the T2 and T4 levels. For unilateral PVBs, 10 mL of local anesthetic will be injected per level. For bilateral paravertebral blocks, 8 mL of local anesthetic will be injected per level.