Intrathecal Morphine and Transversalis Fascia Plane Block for Analgesia After Open Inguinal Hernia Repair

Condition(s) studied

Investigational drug(s) / intervention(s)

Intrathecal Morphine Group: Spinal anesthesia will be performed using 12.5 mg of 0.5% hyperbaric bupivacaine combined with 0.1 mg (100 mcg) of intrathecal morphine, prepared to a total intrathecal volume of 3 mL. No additional peripheral regional block will be performed in this group. Participants will subsequently receive the standardized postoperative multimodal analgesia and intravenous patient-controlled analgesia protocol.

Transversalis Fascia Plane Block Group: Spinal anesthesia will be performed with 15 mg of 0.5% hyperbaric bupivacaine (3 mL). At the completion of surgery, an ultrasound-guided unilateral transversalis fascia plane block will be performed on the surgical side. A 22-gauge, 80-100 mm block needle will be advanced using an in-plane technique to the transversalis fascial plane, and 30 mL of 0.25% bupivacaine will be injected after negative aspiration. Participants will subsequently receive the standardized postoperative multimodal analgesia and intravenous patient-controlled analgesia protocol.

Control Group: Spinal anesthesia will be performed using 12.5 mg of 0.5% hyperbaric bupivacaine combined with 0.1 mg (100 mcg) of intrathecal morphine, prepared to a total intrathecal volume of 3 mL. No additional peripheral regional block will be performed in this group. Participants will subsequently receive the standardized postoperative multimodal analgesia and intravenous patient-controlled analgesia protocol.

Study summary

Inguinal hernia is a common surgical condition, and open inguinal hernia repair may be associated with significant postoperative pain. Inadequate pain control can delay early mobilization, reduce patient comfort, and increase the need for opioid analgesics. Therefore, effective postoperative pain management is an important component of perioperative care.

Several analgesic strategies can be used after open inguinal hernia repair, including systemic multimodal analgesia, neuraxial opioids, and regional anesthesia techniques. Intrathecal morphine can provide prolonged postoperative analgesia but may be associated with opioid-related adverse effects such as nausea, vomiting, pruritus, urinary retention, and respiratory depression. Ultrasound-guided transversalis fascia plane block is a regional anesthesia technique designed to provide analgesia to the inguinal region while potentially reducing systemic opioid requirements.

The aim of this prospective, randomized, assessor-blinded, controlled trial is to compare the postoperative analgesic efficacy of intrathecal morphine, transversalis fascia plane block, and spinal anesthesia alone in adult patients undergoing elective open unilateral inguinal hernia repair.

Eligibility

Primary outcome measure(s)

• Morphine Consumption via Patient-Controlled Analgesia — Up to 24 hours after surgery
  The total amount of intravenous morphine administered via patient-controlled analgesia during the first 24 postoperative hours will be recorded in milligrams (mg) based on the PCA device records.

Trial sites (1)

More Atatürk Chest Diseases and Chest Surgery Training and Research Hospital trials in Turkey

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