Quadratus Lumborum Block vs Intrathecal Morphine for Post-Cesarean Analgesia

Not Applicable

Completed

• Conditions: Postoperative Pain
• Interventions: Drug: ANTERİOR QUADRATUS LUMBORUM BLOCK; Drug: İNTRATECHAL MORPHİNE GROUP

• Registration Number: NCT06612424
• Lead Sponsor: Gaziosmanpasa Research and Education Hospital

Brief Summary

İn this study, planned to compare the post-operative analgesic efficacy of Intrathecal Morphine Administration and anterior Quadratus lumborum Block in elective cesarean section operations.

this study primary aim is; To compare the amount of total analgesic use in the first 24 hours in patients

Our secondary aims are: 1.) To compare and evaluate the first rescue analgesia requirement times 2.) To compare the NRS (Numering rating scale) values (resting and dynamic) at 2. 4. 8. 12 . 24. hours in the postoperative follow-up of the patients after anterior Quadratus lumborum block and Intrathecal morphine administration for postoperative analgesia after elective cesarean section operations under spinal anesthesia.

3.) Comparing the side effects such as postoperative nausea and vomiting

Detailed Description

Participants scheduled for elective cesarean sections under spinal anesthesia will be divided into three groups: anterior Quadratus Lumborum block (QLB), intrathecal morphine, and control groups, using the sealed-envelope randomization method. All participants will receive detailed information and provide informed consent. Anesthesia for all patients will be administered under spinal anesthesia. Spinal anesthesia will be performed with 12 mg of bupivacaine injected intrathecally at the L3-4 or L4-5 intervertebral space using a 25G spinocan needle.

In the intrathecal morphine group, 100 micrograms of morphine (0.1 mL) will be added to the 12 mg of intrathecally administered bupivacaine. In the QLB and control groups, intrathecal morphine will not be administered, and 0.1 mL of saline will be added to 12 mg of bupivacaine instead. In the anterior QLB block group, the block will be performed postoperatively. Participants in the QLB group will be taken at the end of the surgery.

All blocks will be performed by the same anesthesiologist using ultrasound guidance. In the Quadratus Lumborum block group, participants will be placed in the lateral decubitus position. A convex ultrasound probe will be placed in sterile conditions along the midaxillary line, in the subcostal area above the iliac crest, to visualize the quadratus lumborum and psoas major muscles, as well as the L4 vertebral transverse process. Using an in-plane technique, a 22G, 100 mm peripheral block needle will be advanced anterior to the quadratus lumborum muscle and into the subfascial space between the quadratus lumborum and psoas major muscles. After confirming the correct location with hydrodissection, 20 mL of 0.25% bupivacaine will be injected slowly, observing the fascial displacement on ultrasound. The same procedure will be repeated on the contralateral side. All patients will be monitored in PACU for 30 minutes post-procedure.

The control and intrathecal morphine groups will not receive any postoperative interventions. At the end of the surgery, once the modified Aldrete score is greater than 8, participants will be transferred to the ward due to the spinal anesthesia. Postoperatively, when the spinal anesthesia level recedes by two dermatomes, patients will receive 1g of intravenous paracetamol for analgesia. The postoperative analgesic regimen will include paracetamol 1g every 6 hours (4x1g). In participants with NRS (Numerical Rating Scale) scores greater than 3 during postoperative follow-up, 75 mg of intravenous diclofenac sodium will be administered as rescue analgesia in the ward. Diclofenac was not to be administered more than twice daily, and if the NRS score remained ≥4 despite two doses, intravenous tramadol at a dose of 1 mg/kg was planned.

Participants will be evaluated at 2, 4, 8, 12, and 24 hours postoperatively by a blinded anesthesiologist different from the one who performed the block. Resting and dynamic NRS scores (rated on a scale of 0-10, where 0 indicates no pain and 10 indicates the most severe pain; dynamic NRS scores will be assessed by asking the patient to cough) will be recorded, along with the total amount of analgesics used in the first 24 hours postoperatively, and the incidence of nausea, vomiting, and pruritus will also be evaluated.

Study Timeline

• Study First Submitted: 2024-09-21
• Study First Submitted QC: 2024-09-21
• Study Start: 2024-09-22
• Study First Posted: 2024-09-25
• Primary Completion: 2025-03-28
• Study Completion: 2025-04-01
• Status Verified: 2025-05
• Last Update Submitted: 2025-05-20
• Last Update Posted: 2025-05-23

Recruitment & Eligibility

• Status: COMPLETED
• Sex: Female
• Target Recruitment: 118

Inclusion Criteria

Inclusion Criteria:

• Participants aged between 18 and 40
• ASA 2 risk group
• Participants at 37-41 weeks of pregnancy
• undergoing cesarean section under spinal anesthesia

Exclusion Criteria

• The participant does not accept the procedure.
• Patients with a history of eclampsia and preeclampsia during pregnancy
• local anesthetic allergy
• Infection at the procedure site
• Anticoagulant use with bleeding disorder
• Chronic analgesia and opioid use
• Mental, psychiatric and neurological problems -Participant with ASA 3 and above with a history of any chronic disease. -

Study & Design

• Study Type: INTERVENTIONAL
• Study Design: PARALLEL

Arm && Interventions

Group	Intervention	Description
anterior quadratus lumborum block	ANTERİOR QUADRATUS LUMBORUM BLOCK	All blocks will be performed by the same anesthesiologist using ultrasound guidance. In the Quadratus Lumborum block group, patients will be placed in the lateral decubitus position. A convex ultrasound probe will be placed in sterile conditions along the midaxillary line, in the subcostal area above the iliac crest, to visualize the quadratus lumborum and psoas major muscles, as well as the L4 vertebral transverse process. Using an in-plane technique, a 22G, 100 mm peripheral block needle will be advanced anterior to the quadratus lumborum muscle and into the subfascial space between the quadratus lumborum and psoas major muscles. After confirming the correct location with hydrodissection, 20 mL of 0.25% bupivacaine will be injected slowly, observing the fascial displacement on ultrasound. The same procedure will be repeated on the contralateral side.
intratechal morphine group	İNTRATECHAL MORPHİNE GROUP	In the intrathecal morphine group, 100 micrograms of morphine (0.1 mL) will be added to the 12 mg of intrathecally administered bupivacaine.

Primary Outcome Measures

Name	Time	Method
comparing the amount of total analgesic use in the first 24 hours in patients	24 hour	For all Participants, postoperative analgesia was planned as paracetamol 1g four times a day for the first 24 hours after surgery. Participants with Numeric Rating Scale (NRS) scores greater than 3 at 2, 4, 8, 12, and 24 hours postoperatively will receive rescue analgesia with diclofenac sodium 75 mg at a dose intravenos.The total diklofenac sodium consumption of participants within the first 24 hours will be compared.

Secondary Outcome Measures

Name	Time	Method
To compare the NRS (Numering rating scale) values (resting and dynamic) at 2. 4. 8. 12 . 24. hours in the postoperative follow-up of the patients	24 hour	To compare the Numeric Rating Scale (NRS) values (at rest and with movement) of the patients during postoperative follow-ups at 2, 4, 8, 12, and 24 hours.
To compare postoperative side effects such as nausea, vomiting, and itching.	24 hour	To compare postoperative side effects such as nausea, vomiting, and itching.
time to first rescue analgesic requirement.	24 hour	Comparison of the time to first rescue analgesic requirement.

Trial Locations

Locations (1)

Gaziosmanpasa Research and Education Hospital, Istanbul, 34000; 🇹🇷 Istanbul, Turkey