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Ultrasound Blocks for the Anterior Abdominal Wall

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76 | <strong>Ultrasound</strong> <strong>Blocks</strong> <strong>for</strong> <strong>the</strong> <strong>Anterior</strong> <strong>Abdominal</strong> <strong>Wall</strong><br />

Obstetric Surgery<br />

The IIB has been evaluated after general anes<strong>the</strong>sia and spinal<br />

anes<strong>the</strong>sia. Overall, <strong>the</strong> quality of postoperative analgesia was<br />

improved compared to placebo with reduced pain reports, an<br />

increased time <strong>for</strong> first rescue analgesic and reduced opioid<br />

need. Pain scores and analgesic requirements may be reduced<br />

<strong>for</strong> <strong>the</strong> first 24 hours (Ganta 1994, Belavy 2009).<br />

These results suggest that <strong>the</strong> IIB should be always per<strong>for</strong>med<br />

after cesarean delivery under general anes<strong>the</strong>sia or spinal<br />

anes<strong>the</strong>sia when neuraxial opioids are not used (Belavy 2009).<br />

However, adverse effects related to opioids have been reported<br />

to be not reduced by IIB. A recent Cochrane review indicated<br />

that women who undergo cesarean section under regional<br />

anes<strong>the</strong>sia with IIB have decreased opioid consumption but no<br />

difference in visual analogue pain scores (Bamigboye 2009).<br />

The block of <strong>the</strong> transverse abdominal muscle plexus, in which<br />

<strong>the</strong> IIH and <strong>the</strong> IIN run, provided better analgesia with reduced<br />

opioid request and delayed time to rescue analgesic compared<br />

with placebo (McDonnell 2008). More patients have been<br />

reported to be able to put <strong>the</strong> babies to <strong>the</strong> breast at 8 hours<br />

(Kuppuvelumani 1993).<br />

Neuraxial opioid is currently <strong>the</strong> “gold standard” treatment<br />

<strong>for</strong> pain after cesarean delivery. Bilateral ultrasound-guided<br />

TAPB in patients undergoing cesarean delivery under<br />

subarachnoid anes<strong>the</strong>sia with fentanyl resulted in significantly<br />

reduced total morphine use <strong>for</strong> 24 h (Belavy 2009, Baaj 2010).<br />

TAPB and subarachnoid anes<strong>the</strong>sia with fentanyl compared to<br />

intravenous morphine and regular non-steroidal analgesics<br />

reduced total morphine requirements by 60%-70% and<br />

postoperative pain in <strong>the</strong> first 48 hours (McDonnell 2008, Baaj<br />

2010).<br />

Opioid-related, dose-dependent, side-effects including nausea,<br />

vomiting, pruritus and sedation, may occur. Delayed maternal<br />

respiratory depression due to cephalic spread of hydrophilic

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