The Effect of Bilateral Erector Spina Plane Block on Postoperative Pain in Adult Cardiac Surgery.

A high-frequency ultrasound linear probe, covered with a sterile sheath, will be placed approximately 2 cm to the right or left of the T 4-5 spinous process. After showing the T 4-5 transverse process and the erector spinae muscle on top of it, a 22-gauge, 80 mm insulated quincke type needle will be inserted into the skin at an angle of approximately 30 degrees from cranial to caudal, using the in-plane technique. When the transverse process is touched, the needle will be pulled out and after a negative aspiration test with 0.5 mL of normal saline and after the demonstration of a hypo-echogenic image and hydro dissection, a local anesthetic solution will be applied to the fascia beneath the erector spinae muscle. A 20 mL dose of 0.25% bupivacaine, which has been shown to spread both above and below the T 4-5 level, will be injected.