Abstract
The local anesthetic (LA) systemic toxicity of trunk blocks is a major concern. Recently, modified thoracoabdominal nerve block through perichondrial approach (M-TAPA) has attracted attention; however, plasma LA level is unknown. We tested whether the peak plasma LA concentration following M-TAPA, using 25 mL of 0.25% levobupivacaine mixed with epinephrine on each side, would be below the toxic level (2.6 μg/mL). We recruited 10 patients undergoing abdominal surgery with planned M-TAPA between November 2021 and February 2022. In all patients, 25 mL of 0.25% levobupivacaine mixed with 1:200,000 epinephrine was administered on each side. Blood samples were obtained at 10, 20, 30, 45, 60, and 120 min after the block. The highest individual peak and the mean peak plasma LA concentrations were 1.03 and 0.73 μg/mL, respectively. We could not capture the peak in five patients; however, the highest concentrations in all patients were significantly lower than the toxic level. A negative correlation between the peak level and body weight was observed. Our results indicated that the plasma LA concentration following M-TAPA using total of 50 mL of 0.25% levobupivacaine with epinephrine remains below the toxic level. Further research is required due to the small sample size of this study.
Trial registry number: UMIN000045406.
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Data are available on reasonable request.
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Acknowledgements
We would like to thank Maruishi Pharmaceutical Co. for measuring serum levobupivacaine concentrations and Editage (www.editage.com) for English language editing.
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All authors contributed to the study conception and design. Material preparation, data collection and analysis were performed by KA, and YU. The first draft of the manuscript was written by KA and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Maruishi Pharmaceutical Cooperation (Osaka, Japan), which distributes levobupivacaine in Japan, supported our study by measuring plasma levobupivacaine concentration without any compensation. The authors do not have any other conflict of interest to disclose.
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Aikawa, K., Uchinami, Y. & Morimoto, Y. Chronological changes in plasma levobupivacaine concentrations after bilateral modified thoracoabdominal nerve block through perichondrial approach. J Anesth 37, 641–644 (2023). https://doi.org/10.1007/s00540-023-03209-0
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DOI: https://doi.org/10.1007/s00540-023-03209-0