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Effects of Injection Volume and Site on Sensory Distribution After Rectus Sheath Block
Sponsor: Chiang Mai University
Summary
This randomized controlled study aims to evaluate the effects of local anesthetic injection volume and injection site on cutaneous sensory distribution following ultrasound-guided rectus sheath block (RSB). Participants undergoing laparoscopic abdominal surgery will be randomized to receive RSB using different injection sites and volumes (20 mL or 30 mL per side). Injection sites will be selected according to the surgical location, including upper, middle, or lower rectus sheath approaches. Cutaneous sensory distribution will be assessed to determine the extent and pattern of sensory blockade associated with each technique. The findings may help optimize injection techniques and local anesthetic volumes to achieve adequate sensory coverage for abdominal surgery.
Official title: Effects of Local Anesthetic Volume and Injection Site on Cutaneous Sensory Distribution After Rectus Sheath Block: A Randomized Study
Key Details
Gender
All
Age Range
20 Years - Any
Study Type
INTERVENTIONAL
Enrollment
120
Start Date
2026-10-12
Completion Date
2027-12-31
Last Updated
2026-10-15
Healthy Volunteers
No
Conditions
Interventions
Ultrasound-Guided Upper Rectus Sheath Block (20 mL)
Bilateral ultrasound-guided upper rectus sheath block will be performed using 20 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the upper abdominal injection site.
Ultrasound-Guided Upper Rectus Sheath Block (30 mL)
Bilateral ultrasound-guided upper rectus sheath block will be performed using 30 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the upper abdominal injection site.
Ultrasound-Guided Middle Rectus Sheath Block (20 mL)
Bilateral ultrasound-guided middle rectus sheath block will be performed using 20 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the middle abdominal injection site.
Ultrasound-Guided Middle Rectus Sheath Block (30 mL)
Bilateral ultrasound-guided middle rectus sheath block will be performed using 30 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the middle abdominal injection site.
Ultrasound-Guided Lower Rectus Sheath Block (20 mL)
Bilateral ultrasound-guided lower rectus sheath block will be performed using 20 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the lower abdominal injection site.
Ultrasound-Guided Lower Rectus Sheath Block (30 mL)
Bilateral ultrasound-guided lower rectus sheath block will be performed using 30 mL of 0.25% bupivacaine with epinephrine per side. The local anesthetic will be injected into the plane between the rectus abdominis muscle and the posterior rectus sheath at the lower abdominal injection site.
Locations (1)
Maharaj Nakorn Chiang Mai Hospital, Faculty of Medicine, Chiang Mai University
Chiang Mai, Chiang Mai, Thailand