Ultrasound-guided erector spinae plane block in coronary artery bypass surgery: the role of local anesthetic volume-a prospective, randomized study.

In coronary artery bypass graft surgery, erector spinae plane block performed with 30 ml instead of 20 ml on each side resulted in less pain in the sternum and chest tube region, less need for rescue analgesics, and delayed first-rescue analgesic requirement.