Efficacy of pectoral nerve block type II versus thoracic paravertebral block for analgesia in breast cancer surgery.

Background: Ultrasound-guided pectoral nerve block type II is a recently proposed technique for postoperative analgesia after breast cancer surgery. The thoracic paravertebral block is widely used for this purpose by decades. The presented study compares the efficacy of these two techniques for postoperative analgesia.