Title: Is standard NAC dosing adequate for "massive" acetaminophen overdose.<br/>Author: Hong Kim<br/><a href='http://umem.org/profiles/faculty/526/'>[Click to email author]</a><hr/><p>
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Recently, there has been questions if standard n-acetylcysteine (NAC) dose is adequate for massive acetaminophen (APAP) overdose (ingestion of > 32 gm or APAP >300 mcg/mL).</p>
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A retrospective study from a single poison center (1/1/2010 to 12/31/2019) investigated the clinical outcome of massive APAP overdose (APAP > 300 mcg/mL at 4 hour post ingestion) treated with standard dosing of NAC.</p>
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<strong>Results</strong></p>
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1425 cases of APAP overdose identified; 104 met the criteria of massive APAP overdose. </p>
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300-449 mcg/mL: 59.6% (n=62)</li>
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450-599 mcg/mL: 14.4% (n=15)</li>
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>600 mcg/mL: 25.9% (n=27)</li>
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No acute liver injury/hepatotoxicity: 76% (n=79)</li>
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Hepatotoxicity: 24% (n=25)</li>
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Among cases that received NAC within 8 hours post ingestion (n=44)</p>
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Only 9% (n=4) cases developed hepatotoxicity</li>
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Among cases that received NAC > 8 hours post ingestion (n=60)</p>
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35% (n=21) developed hepatotoxicity </li>
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Odds of hepatotoxicity</p>
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5.5 If NAC initiated > 8 hours post ingestion</li>
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3.8 if 4 h post ingestion APAP level >600 mcg/mL </li>
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<strong>Conclusion</strong></p>
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Cohort: no acute liver injury/hepatotoxicity in 76% (n=79)</li>
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Standard NAC dosing initiated within 8 hours prevented hepatotoxicity in 91% (n=40/44)</li>
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