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Background <p>The concurrent use of a ropivacaine transversus abdominis plane (TAP) block with intravenous lidocaine infusion, though effective for pain relief, raises safety concerns regarding local anesthetic systemic toxicity (LAST). This study aimed to assess the dose-risk relationship of LAST in this combination by escalating the ropivacaine dose while fixing the lidocaine dose.</p> Methods <p>In this dose-escalation study, adult patients undergoing colorectal cancer surgery received a 0.2% ropivacaine TAP block (1.5, 2.0 or 2.5&#xa0;mg kg<sup>−1</sup>) and intravenous lidocaine infusion (2&#xa0;mg kg<sup>−1</sup> bolus, followed by 2&#xa0;mg kg<sup>−1</sup> h<sup>−1</sup>), both dosed according to ideal body weight (IBW). The primary outcome was the occurrence of LAST, identified by clinical symptoms, new-onset ECG irregularities, etc. Secondary outcomes included plasma concentrations of ropivacaine and lidocaine.</p> Results <p>Nine patients were included in the per-protocol analysis, and 26 were included in the intention-to-treat analysis. No signs of LAST were observed. Plasma ropivacaine concentrations remained consistently below 2.2&#xa0;µg mL<sup>−1</sup>, however, eight patients in the intention-to-treat population and three patients in the per-protocol population had plasma lidocaine concentrations exceeding 5.0&#xa0;µg mL<sup>−1</sup> at 10&#xa0;min post-bolus. In the per-protocol population, peak plasma ropivacaine concentrations occurred at 30&#xa0;min (range, 20–60) post-TAP block, with median values of 1.14 (range, 0.85–1.18), 1.42 (range, 1.29–1.80), and 1.96 (range, 1.47–2.06) µg mL<sup>−1</sup> across dose groups. The peak plasma lidocaine concentrations in patients occurred at 10&#xa0;min post-bolus infusion, with median values of 4.59&#xa0;µg mL<sup>−1</sup> (range, 3.24–6.67) and gradually decreased after 2&#xa0;h. The intention-to-treat analysis found similar results.</p> Conclusion <p>Although no signs of LAST were observed with the combination of a 1.5 to 2.5&#xa0;mg kg<sup>−1</sup> ropivacaine TAP block and intravenous lidocaine infusion under general anaesthesia, extreme caution is still warranted regarding the potential risk of LAST. </p> Trial registration <p>This trial was registered at ClinicalTrials.gov (NCT06006026) on 23 August 2023.</p>

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Combining ropivacaine transversus abdominis plane block with intravenous lidocaine infusion in adults undergoing colorectal cancer surgery: an open-label, dose-escalation exploratory trial

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月22日

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  • Mengmeng Zhou,
  • Feng Yu,
  • Yan Xu,
  • Jingwen Wu,
  • Lajing Luowu,
  • Qianqian Tang,
  • Xiaoting Hao,
  • Kun Shao,
  • Mao Ye,
  • Lulong Bo,
  • Li Zhou,
  • Chunling Jiang

摘要

Background

The concurrent use of a ropivacaine transversus abdominis plane (TAP) block with intravenous lidocaine infusion, though effective for pain relief, raises safety concerns regarding local anesthetic systemic toxicity (LAST). This study aimed to assess the dose-risk relationship of LAST in this combination by escalating the ropivacaine dose while fixing the lidocaine dose.

Methods

In this dose-escalation study, adult patients undergoing colorectal cancer surgery received a 0.2% ropivacaine TAP block (1.5, 2.0 or 2.5 mg kg−1) and intravenous lidocaine infusion (2 mg kg−1 bolus, followed by 2 mg kg−1 h−1), both dosed according to ideal body weight (IBW). The primary outcome was the occurrence of LAST, identified by clinical symptoms, new-onset ECG irregularities, etc. Secondary outcomes included plasma concentrations of ropivacaine and lidocaine.

Results

Nine patients were included in the per-protocol analysis, and 26 were included in the intention-to-treat analysis. No signs of LAST were observed. Plasma ropivacaine concentrations remained consistently below 2.2 µg mL−1, however, eight patients in the intention-to-treat population and three patients in the per-protocol population had plasma lidocaine concentrations exceeding 5.0 µg mL−1 at 10 min post-bolus. In the per-protocol population, peak plasma ropivacaine concentrations occurred at 30 min (range, 20–60) post-TAP block, with median values of 1.14 (range, 0.85–1.18), 1.42 (range, 1.29–1.80), and 1.96 (range, 1.47–2.06) µg mL−1 across dose groups. The peak plasma lidocaine concentrations in patients occurred at 10 min post-bolus infusion, with median values of 4.59 µg mL−1 (range, 3.24–6.67) and gradually decreased after 2 h. The intention-to-treat analysis found similar results.

Conclusion

Although no signs of LAST were observed with the combination of a 1.5 to 2.5 mg kg−1 ropivacaine TAP block and intravenous lidocaine infusion under general anaesthesia, extreme caution is still warranted regarding the potential risk of LAST.

Trial registration

This trial was registered at ClinicalTrials.gov (NCT06006026) on 23 August 2023.