JOURNAL ARTICLE
RANDOMIZED CONTROLLED TRIAL
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Reducing Pain During Emergency Arterial Sampling Using Three Anesthetic Methods: A Randomized Controlled Clinical Trial.

BACKGROUND: Taking a sample of arterial blood is widely reported as a cause of significant pain.

OBJECTIVES: To compare three anesthetic methods with standard practice (no anesthesia) to establish which was the most effective in reducing pain caused by radial artery puncture in patients requiring an arterial blood gas test in the emergency department (ED).

METHODS: A randomized controlled trial was conducted to compare the effectiveness between anesthetic cream, cryoanalgesia, and subcutaneous mepivacaine in reducing pain caused by radial artery puncture in ED patients.

RESULTS: After comparing perceived pain during arterial puncture, the lowest median score was obtained in the mepivacaine group (1 interquartile range 0.6-1.3) and the highest median score in the control group (5 interquartile range 4.0-7.0). When comparing the control group with the three intervention groups, the Kruskal-Wallis test showed that mepivacaine (p = 0.023) and cryoanalgesia (p = 0.012) were associated with significantly lower pain scores. The anesthetic cream (p = 0.861) intervention group did not produce a statistically significant median difference compared with the control group.

CONCLUSIONS: The results of this study encourage the use of anesthetic methods like cryoanalgesia or mepivacaine for their proven effectiveness in reducing or eliminating pain during arterial puncture.

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