Effect of Preoperative Erector Spinae Plane Block on Recovery Quality, Time to Return to Daily Activities, and Postoperative Pain Scores in Inguinal Hernia Surgery

This prospective, randomized, controlled study is designed to evaluate the effect of erector spinae plane block (ESPB) on postoperative recovery in patients undergoing open inguinal hernia repair under spinal anesthesia.

After obtaining written informed consent, eligible patients aged 18-65 years will be enrolled. Standard monitoring, including electrocardiography, non-invasive blood pressure, and peripheral oxygen saturation, will be applied upon arrival in the operating room. An intravenous line will be established, and isotonic saline infusion (15 mL/kg/h) will be initiated. Sedation will be provided with intravenous midazolam (0.03 mg/kg).

Spinal anesthesia will be performed at the L3-L4 interspace using 13 mg hyperbaric bupivacaine combined with 15 µg fentanyl.

At the end of surgery, patients will be randomized into two groups using a computer-generated randomization list prepared by an independent statistician. Group allocation will be concealed in sealed opaque envelopes and revealed to the anesthesiologist performing the intervention.

In the ESPB group, an ultrasound-guided erector spinae plane block will be performed at the T11-T12 level on the side of surgery. Patients will be positioned in the lateral decubitus position. After sterile preparation, a 2-5 MHz convex ultrasound probe (Fujifilm Sonosite, USA) will be placed in a paramedian sagittal orientation and then shifted laterally to visualize the transverse process and erector spinae muscle. A 22-gauge, 100-mm needle will be advanced using an in-plane technique, and 30 mL of 0.25% bupivacaine will be injected into the fascial plane between the transverse process and erector spinae muscle.

Patients in the control group will not receive any regional block.

All patients will receive a standardized postoperative analgesic regimen consisting of intravenous dexketoprofen (50 mg every 6 hours). Rescue analgesia will be provided with intravenous tramadol (1 mg/kg) if the Numeric Rating Scale (NRS) score is ≥4.

Postoperative monitoring will be conducted in the recovery unit and surgical ward according to institutional protocols. Clinical data, including spinal anesthesia parameters such as block duration, motor block level, and sensory block level, will be recorded.

Follow-up assessments will be performed within the first 24 hours after surgery and via telephone contact 30 days after surgery to evaluate functional recovery.