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• W2113455450 abstract "To the Editor, The iliac crest is primarily innervated by the L1 nerve root via the iliohypogastric and ilioinguinal nerves. We describe our preliminary experience with a transversalis fascia plane (TFP) block, which targets these nerves in the plane between the transversus abdominis (TA) aponeurosis or muscle and the deeper transversalis fascia. It can thus provide effective analgesia for anterior iliac crest bone graft (ICBG) harvesting. This technique is distinct from the transversus abdominis plane block, which does not reliably block the L1 dermatome, although its use has been described in ICBG harvesting. Following Ethics Board approval, we reviewed the records of 27 adult patients who underwent harvesting of an anterior ICBG as part of surgery on the distal forearm and wrist between November 1, 2009 and February 28, 2011 at the Toronto Western Hospital. All patients underwent general anesthesia preceded by a single-shot brachial plexus block with 30–40 mL of local anesthetic (1:1 mixture of 2% lidocaine and 0.5% bupivacaine, with epinephrine 2.5 lg mL). Twelve (44%) patients also underwent an ultrasound-guided TFP block. The ultrasound probe was placed in a transverse orientation above the iliac crest; and the external oblique, internal oblique (IO), and TA muscles were identified and traced posteriorly until first the TA muscle and then the IO muscle tapered into their common aponeurosis, adjacent to the quadratus lumborum muscle (Figure, A). The tip of a 22-gauge 80-mm block needle was positioned just deep to the TA muscle and its aponeurosis at the point where the TA tapered off. Ropivacaine 0.5% (20 mL) with epinephrine 5 lg mL was injected into the plane between the TA and underlying transversalis fascia (Figure, B). Intraoperative and postoperative analgesia of the ICBG harvest site was provided by systemic opioids at the discretion of the operating theatre and postanesthesia care unit (PACU) staff. We extracted data on opioid consumption and pain scores during the immediate perioperative period, defined as the time at which the patient entered the operating room to the time the patient left the PACU. We converted all opioid doses into intravenous morphine equivalents and divided patients into two groups for comparison based on whether they had undergone a TFP block. The mean (standard deviation) perioperative opioid dose was substantially lower in the patients who underwent a TFP block [18.5 (9.6) mg of intravenous morphine equivalent] than in those who did not [32.6 (12.4) mg] (P = 0.006). These patients received less intravenous morphine during both the intraoperative period [10.2 (5.6) mg vs 17.4 (6.6) mg; P = 0.009] and the PACU period [8.3 (9.6) mg vs 15.1 (11.2) mg; P = 0.114]. It is of note that only one (8%) patient received intravenous ketorolac 30 mg in the TFP group compared with five (33%) patients in the other group. Patients who underwent a TFP block also had lower resting pain scores in the PACU. Pain scores (median [range]) were lower in the TFP group both at admission to the PACU (2 [0–6] vs 6 [5–7]; P = 0.015) as K. J. Chin, MBBS (&) V. Chan, MD M. Harris, MB BChir Toronto Western Hospital, University of Toronto, Toronto, ON, Canada" @default.
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• W2113455450 date "2011-10-19" @default.
• W2113455450 modified "2023-10-10" @default.
• W2113455450 title "Ultrasound-guided transversalis fascia plane block provides analgesia for anterior iliac crest bone graft harvesting" @default.
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• W2113455450 doi "https://doi.org/10.1007/s12630-011-9610-7" @default.
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