How long do I have to wait for anesthesia after the block is placed? How long does it last? The block should start working within 10 minutes, and achieve maximal anesthesia within 15-20 minutes. A block using lidocaine will typically last for at least 90 minutes, sometimes longer. Using a larger volume of a longer acting local anesthetic such as bupivacaine can result in a dense block that lasts for several hours or longer.
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ACEP News: Vol 31 – No 12 – December 2012Dr. Herring and Dr. Miss are Ultrasound Fellows at Highland General Hospital. Dr. Nagdev is Director of Emergency Ultrasound at Highland General Hospital.
[References can be found in the online version at www.acepnews.com.]
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