Researchers at Brigham and Women's Hospital in Boston found that nerve blocks do not cause nerve hypersensitivity in healthy volunteers.
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Don't blame the block: Study finds nerve blocks alone don't increase pain sensitivity in healthy volunteers

40 Healthy Volunteers Study type
No Nerve Hypersensitivity Detected Finding
Rebound Pain Is Unmasked Surgical Pain Conclusion
Nerve Blocks Are Safe For Pain Control Implication
Several hours of testing
40 volunteers tested