What type of study is this?

This is a Quantitative Study study.

Quantitative Sensory Changes in Humans After Intravenous Regional Block With Mepivacaine

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Quantitative sensory testing reveals selective cold receptor depression in the mepivacaine-treated arm, implying varied sensory responses.

Cold sensitivity was significantly decreased 10 and 30 minutes after intravenous regional block with mepivacaine.
Ischemic pain ratings were consistent between treated and untreated arms, indicating no overall nerve function depression.
The method involved 16 volunteers receiving bilateral blocks of mepivacaine and saline in a randomized, double-blind setup.
These findings suggest that intravenous regional block can differentially affect sensory signals without uniform nerve impairment.

Kálmán et al. (1999) studied this question.

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Quantitative sensory testing reveals selective cold receptor depression in the mepivacaine-treated arm, implying varied sensory responses.