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Ultrasound-guided rectus sheath block or wound infiltration in children: a randomized blinded study of analgesia and bupivacaine absorption.

ABSTRACT: Rectus sheath block can provide analgesia following umbilical hernia repair. However, conflicting reports on its analgesic effectiveness exist. No study has investigated plasma local anesthetic concentration following ultrasound-guided rectus sheath block (USGRSB) in children.Compare the effectiveness and bupivacaine absorption following USGRSB or wound infiltration (WI) for umbilical hernia repair in children.A randomized blinded study comparing WI with USGRSB in 40 children undergoing umbilical hernia repair was performed. Group WI (n = 20) received wound infiltration 1 mg·kg(-1) 0.25% bupivacaine. Group RS (n = 20) received USGRSB 0.5 mg·kg(-1) 0.25% bupivacaine per side in the posterior rectus sheath compartment. Pain scores and rescue analgesia were recorded. Blood samples were drawn at 0, 10, 20, 30, 45, and 60 min.Patients in the WI group had a twofold increased risk of requiring morphine (hazard ratio 2.06, 95% CI 1.01, 4.20, P = 0.05). When required, median time to first morphine dose was longer in the USGRSB group (65.5 min vs. 47.5 min, P = 0.049). Peak plasma bupivacaine concentration was higher following USGRSB than WI (median: 631.9 ng·ml(-1) IQR: 553.9-784.1 vs. 389.7 ng·ml(-1) IQR: 250.5-502.7, P = 0.002). Tmax was longer in the USGRSB group (median 45 min IQR: 30-60 vs. 20 min IQR: 20-45, P = 0.006).USGRSB provides more effective analgesia than WI for umbilical hernia repair. USGRSB with 1 mg·kg(-1) 0.25% bupivacaine is associated with safe plasma bupivacaine concentration that peaks higher and later than WI. Caution against using larger volumes of higher concentration local anesthetic for USGRSB is advised.

SUBMITTER: Flack SH

PROVIDER: S-EPMC4125512 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature

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Ultrasound-guided rectus sheath block or wound infiltration in children: a randomized blinded study of analgesia and bupivacaine absorption.

Flack Sean H SH Martin Lizabeth D LD Walker Benjamin J BJ Bosenberg Adrian T AT Helmers Laurilyn D LD Goldin Adam B AB Haberkern Charles M CM

Paediatric anaesthesia 20140522 9

<h4>Background</h4>Rectus sheath block can provide analgesia following umbilical hernia repair. However, conflicting reports on its analgesic effectiveness exist. No study has investigated plasma local anesthetic concentration following ultrasound-guided rectus sheath block (USGRSB) in children.<h4>Objectives</h4>Compare the effectiveness and bupivacaine absorption following USGRSB or wound infiltration (WI) for umbilical hernia repair in children.<h4>Methods</h4>A randomized blinded study compa ...[more]

PMID: 24853314

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Project description:Intervention1: Rectus sheath block: A USG machine with linear array probe (5-12MHz) with an imaging depth of 4-6cm will be used for performing the block. The ultrasound probe will be placed transverse on abdomen, immediately lateral (3 cm) to umbilicus. A 20-gauge needle will be inserted in-plane in a medial to lateral orientation, through the subcutaneous tissue, to pierce through the anterior rectus sheath. Upon identification of the rectus muscle and hyperechoic twin lines deep to it (posterior rectus sheath and fascia transversalis) in the ultrasound image the needle tip will be advanced to the desired position, posterior to the rectus muscle and above the underlying posterior rectus sheath under direct vision. Following conï¬?rmation of the correct position of the needle tip with hydro dissection of the rectus muscle away from the posterior rectus by administration of 0.51ml of normal saline; 20ml of 0.25% bupivacaine will be administered for block performance. The procedure will be repeated on the opposite side. Intervention2: oblique subcostal Transversus abdominis plane block: A USG linear array probe with high- or an intermediate-frequency linear probe of 35 to 40 mm will provide adequate imaging. A needle of up to 15 to 20 cm in length , bend into a slight curve will be required , decribed by Hebbard et al .15 The operator will stand on the left side of the patient in the supine position, and both sides are blocked from this position, with the right hand holding the needle and the left hand holding the probe. To perform the block, the rectus abdominis and underlying transversus abdominis muscles will be identified near the costal margin and xyphoid. Local anesthetic is injected incrementally in the TAP (hydrodissection) by a needle passing along the obliq Primary outcome(s): â?¢To assess the analgesic efficacy of rectus sheath block. â?¢To assess the analgesic efficacy of oblique subcostal TAP block. â?¢To compare the analgesic efficacy of both blocks. Timepoint: 24 hrs Study Design: Randomized, Parallel Group Trial Method of generating randomization sequence:Coin toss, Lottery, toss of dice, shuffling cards etc Method of allocation concealment:An Open list of random numbers Blinding and masking:Participant and Investigator Blinded

Dataset Information

Ultrasound-guided rectus sheath block or wound infiltration in children: a randomized blinded study of analgesia and bupivacaine absorption.

Publications

Ultrasound-guided rectus sheath block or wound infiltration in children: a randomized blinded study of analgesia and bupivacaine absorption.

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