Acetaminophen overdose
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Transcript of Acetaminophen overdose
ACETAMINOPHEN OVERDOSE HARIKRISHNA SHEEJA GROUP#612
Paracetamol Overdose
MOST COMMON
FEW SYMPTOM
S12g
FATAL
Characteristics of Acetaminophen
White solid crystals Lightly soluble in cold water Greater solubility in hot water Solubility in organic solvents Soluble in menthol
Acetaminophen’s Pharmaceutical Classes
Derivative of acetanilide Analgesic Non-narcotic Antipyretic
Metabolism
Clinical picture
After 72-96hrs of ingestion
Minimum toxic doses for a single ingestion, posing significant risk of severe hepatotoxicity:
Adults: 7.5-10 gChildren: 150 mg/kg; 200 mg/kg in healthy children aged 1-6 years
Serum Acetaminophen Levels
Rumack-Matthew nomogram
Diagnosis
PCM LEVELS BLOOD &URINE
TOXICOLOGY SCREEN
MANAGEMENT
• EMPTY STOMACH TAKEN WITHIN 1 HOUR
• If < 8 hours :Tx of choice – activated charcoal 1g/kg
If 8-24 hours & suspicious of large overdose (> 7.5g )
If Unknown Time of overdose
Determine serum acetaminophen levels
Determine INR levels, LFT
Treat with Acetylcysteine if serum Acetaminophen or transaminases (ALT, AST) are detected
Patient should not take over 4 grams of Acetaminophen/day.
Threshold may be lower for patients with liver disease or cirrhosis
Increased risk of hepatotoxicity with chronic alcohol use
Patient should be careful when taking numerous products containing Acetaminophen
Reference
http://bestpractice.bmj.com/best-practice/monograph/337/basics/pathophysiology.html
http://emedicine.medscape.com/article/820200-overview http://
www.nhs.uk/Conditions/Poisoning/Pages/Symptoms.aspxSarawak Handbook of Medical Emergencies 3rd EditionOxford Handbook of Clinical Medicine 6th Ed.