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RSACP wishes to inform that it shall be discontinuing the dispatch of print copy of JOACP to it's Life members. The print copy of JOACP will be posted only to those life members who send us a written confirmation for continuation of print copy.
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Year : 2019  |  Volume : 35  |  Issue : 2  |  Page : 153-156

Exploring the transversus abdominis plane block in cesarean sections and the subsequent toxicity risk to neonates via breast milk

1 Department of Anesthesia and Critical Care, University of Chicago Medical Center, Chicago, IL, USA
2 Department of Pharmacology and Anesthesiology, New York Medical College, Valhalla, NY, USA
3 Division of Regional Anesthesia and Acute Pain Management, Department of Anesthesiology, Westchester Medical Center/New York Medical College, Valhalla, NY, USA

Correspondence Address:
Jeff L Xu
Division of Regional Anesthesia and Acute Pain Management, Department of Anesthesiology, Westchester Medical Center/New York Medical College, 100 Woods Road, Macy Building 2391, Valhalla, NY - 10595
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Source of Support: None, Conflict of Interest: None

DOI: 10.4103/joacp.JOACP_343_18

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The transversus abdominis plane (TAP) block with its wide application has shown to be an analgesic effective for use in abdominal surgeries, including for cesarean section. However, the bupivacaine delivered in the TAP block comes with the risk of toxicity, both central nerve system (CNS) and cardiovascular system, and has been shown in some instances to reach maximum serum concentrations in excess of the 2 μg/mL associated with the lower end of CNS toxicity. There is a specific concern with cesarean section TAP blocks of the anesthetic passage to the neonate via maternal breast milk and whether this poses a toxicity risk. Bupivacaine has been shown to pass into maternal milk at concentrations 0.34 times the maternal serum concentration. Preliminary statistical analyses suggest that the bupivacaine delivered in breast milk is not in concentrations high enough to cause neonatal toxicity, but further studies would be useful in identifying what the toxicity risk is, if any, to the neonates' breastfeeding after the delivery and TAP block.

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