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We measured the serum concentration of lidocaine after transversus abdominis plane (TAP) block with 40 ml of 1% lidocaine in 12 patients under general anesthesia, using a fluorescence polarization immunoassay. The peak mean serum concentration of lidocaine occurred 30 min after the block (3.6 ± 0.7 μg·ml−1). The highest concentration of lidocaine (5.5 μg·ml−1) was recorded 15 min after the block....
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