A Case Report of a Severe, Unusually Delayed Anaphylactoid Reaction to Intravenous N-Acetylcysteine During Treatment of
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CASE REPORT
A Case Report of a Severe, Unusually Delayed Anaphylactoid Reaction to Intravenous N-Acetylcysteine During Treatment of Acute Acetaminophen Toxicity in an Adolescent L. Claire Epperson 1 & Stephanie T. Weiss 2,3
&
Dazhe James Cao 2
Received: 30 March 2020 / Revised: 27 July 2020 / Accepted: 1 August 2020 # American College of Medical Toxicology 2020
Abstract Introduction Anaphylactoid reactions are well-documented adverse events associated with the intravenous administration of Nacetylcysteine (NAC) in patients with acetaminophen overdose. Most reactions are mild, occurring within the first 1–5 hours of initiation. This report presents the case of an adolescent with a delayed, life-threatening anaphylactoid reaction 24.5 hours after starting NAC, where discontinuing NAC could have resulted in fulminant hepatic failure (FHF) and death. Case Report A 17-year-old previously healthy female presented with nausea, vomiting, and abdominal pain 10 hours after an acute acetaminophen ingestion. Her 11-hour serum acetaminophen concentration was above the treatment line (149 μg/mL), and she had elevated transaminases (AST = 202 U/L, ALT = 284 U/L). She was treated with intravenous NAC, which was suspended for 3 hours after she developed an apparent life-threatening anaphylactoid reaction with angioedema and respiratory distress 24.5 hours after treatment initiation. Given her high risk of progression to FHF, NAC was resumed at double the previous rate along with scheduled corticosteroids and antihistamines after resolution of her symptoms. Her AST increased to 10,927 U/L, and INR peaked at 3.6, but she had no further anaphylactoid symptoms. She was discharged in her normal state of health after 6 days. Discussion Discontinuing NAC in this case of severe, delayed anaphylactoid reaction could have resulted in FHF requiring liver transplant. The reason for her reaction is unclear but could be related to patient risk factors or medication error. Guidelines for reinitiation of NAC after development of delayed anaphylactoid reactions are not well-established. Close observation beyond the first 1–5 hours of NAC administration is warranted. Keywords Acetaminophen . N-acetylcysteine . Anaphylactoid reaction
Introduction
Supervising Editor: Mark B. Mycyk, MD Electronic supplementary material The online version of this article (https://doi.org/10.1007/s13181-020-00804-5) contains supplementary material, which is available to authorized users. * Stephanie T. Weiss [email protected] 1
Department of Emergency Medicine, Integris Southwest Medical Center in conjunction with UT Southwestern Medical Center, Oklahoma City, OK, USA
2
Department of Emergency Medicine, Division of Medical Toxicology, UT Southwestern Medical Center, Dallas, TX, USA
3
Surgery General Administration, Medical Center Boulevard, Winston-Salem, NC 27157, USA
Prompt initiation of N-acetylcysteine (NAC) prevents most cases of acute acetaminophen (APAP)-induced hepatotoxicity and reduces mortality in APAP overdose if initiated within the first 8–10
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