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KMID : 0980320210210040357
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Journal of Dental Anesthesia and Pain Medicine
2021 Volume.21 No. 4 p.357 ~ p.361
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Methemoglobinemia caused by a low dose of prilocaine during general anesthesia
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Shibuya Makiko
Hojo Takayuki
Hase Yuri
Kimura Yukifumi
Fujisawa Toshiaki
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Abstract
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Methemoglobinemia is a blood disorder in which an abnormal amount of methemoglobin is produced, and prilocaine is one of the drugs that can cause this disorder. The maximum recommended dose of prilocaine is 8 mg/kg. We report a case of methemoglobinemia caused by the administration of 4.2 mg/kg of prilocaine without other methemoglobinemia-inducing drugs during general anesthesia. A 17-year-old girl with hyperthyroidism and anemia was scheduled to undergo maxillary sinus floor elevation and tooth extraction. The patient's peripheral oxygen saturation (SpO2) decreased from 100% at arrival to 95% after receiving prilocaine with felypressin following induction of general anesthesia. However, the fraction of inspired oxygen was 0.6. Blood gas analysis showed that the methemoglobin level was 3.8% (normal level, 1%?2%), fractional oxygen saturation was 93.9%, partial pressure of oxygen was 327 mmHg, and arterial oxygen saturation was 97.6%. After administration of 1 mg/kg of methylene blue, her SpO2 improved gradually to 99%, and the methemoglobin value decreased to 1.2%. When using prilocaine as a local anesthetic, it is important to be aware that methemoglobinemia may occur even at doses much lower than the maximum recommended dose.
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KEYWORD
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Anesthesia, General, Methemoglobinemia, Oximetry, Oxyhemoglobins, Prilocaine
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