{"title":"Anaphylaxis due to midazolam administered before induction of general anesthesia: a case report.","authors":"Ryosuke Funabiki, Tatsuo Horiuchi, Toshie Shiraishi, Masaki Orihara, Kazuhiro Nagumo, Shigeru Saito","doi":"10.1186/s40981-025-00800-0","DOIUrl":null,"url":null,"abstract":"<p><strong>Background: </strong>Anaphylaxis is an immediate allergic reaction. However, in some cases, there is a delay between the administration of the causative agent and the onset of anaphylaxis.</p><p><strong>Case presentation: </strong>A 41-year-old woman was scheduled for laparoscopic myomectomy under general anesthesia combined with epidural anesthesia. Midazolam was administered, and an epidural catheter was inserted. Seven minutes after the induction of general anesthesia (17 min after midazolam administration), the patient developed tachycardia, hypotension, and redness of the face and trunk. Her hemodynamic status improved after administration of phenylephrine and elevation of both legs, and the surgery was completed. Increased blood histamine and tryptase levels were observed 30 min after the onset of hemodynamic signs. Based on the above, anaphylaxis was diagnosed. Skin tests later showed that midazolam was the causative agent.</p><p><strong>Conclusions: </strong>A case of perioperative anaphylaxis caused by midazolam, which was used before the induction of general anesthesia, was described.</p>","PeriodicalId":14635,"journal":{"name":"JA Clinical Reports","volume":"11 1","pages":"37"},"PeriodicalIF":0.8000,"publicationDate":"2025-06-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.ncbi.nlm.nih.gov/pmc/articles/PMC12179032/pdf/","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"JA Clinical Reports","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1186/s40981-025-00800-0","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"ANESTHESIOLOGY","Score":null,"Total":0}
引用次数: 0
Abstract
Background: Anaphylaxis is an immediate allergic reaction. However, in some cases, there is a delay between the administration of the causative agent and the onset of anaphylaxis.
Case presentation: A 41-year-old woman was scheduled for laparoscopic myomectomy under general anesthesia combined with epidural anesthesia. Midazolam was administered, and an epidural catheter was inserted. Seven minutes after the induction of general anesthesia (17 min after midazolam administration), the patient developed tachycardia, hypotension, and redness of the face and trunk. Her hemodynamic status improved after administration of phenylephrine and elevation of both legs, and the surgery was completed. Increased blood histamine and tryptase levels were observed 30 min after the onset of hemodynamic signs. Based on the above, anaphylaxis was diagnosed. Skin tests later showed that midazolam was the causative agent.
Conclusions: A case of perioperative anaphylaxis caused by midazolam, which was used before the induction of general anesthesia, was described.
期刊介绍:
JA Clinical Reports is a companion journal to the Journal of Anesthesia (JA), the official journal of the Japanese Society of Anesthesiologists (JSA). This journal is an open access, peer-reviewed, online journal related to clinical anesthesia practices such as anesthesia management, pain management and intensive care. Case reports are very important articles from the viewpoint of education and the cultivation of scientific thinking in the field of anesthesia. However, submissions of anesthesia research and clinical reports from Japan are notably decreasing in major anesthesia journals. Therefore, the JSA has decided to launch a new journal, JA Clinical Reports, to encourage JSA members, particularly junior Japanese anesthesiologists, to publish papers in English language.