Paracetamol or Acetaminophen Poisoning

Описание: Homepage: EMNote.org ■
🚩Membership: https://tinyurl.com/joinemnote
🚩ACLS Lecture: https://tinyurl.com/emnoteacls

Paracetamol Poisoning

Introduction to Paracetamol Poisoning
Paracetamol poisoning occurs due to excessive intake of paracetamol, a common pain reliever and fever reducer.
It is a major toxicological emergency because an overdose can cause severe liver damage.
Screening for paracetamol is essential in all overdose cases to prevent serious health complications.

Pathophysiology of Paracetamol Poisoning
In an overdose, excess paracetamol is metabolized in the liver, producing a toxic substance called NAPQI.
Normally, the liver neutralizes NAPQI with glutathione, but in an overdose, glutathione is depleted.
This depletion leads to liver cell damage and can result in severe liver failure.

Stages of Paracetamol Toxicity
Stage I (0-24 hours): Mild or no symptoms.
Stage II (24-72 hours): Right upper quadrant pain and rising liver enzymes.
Stage III (72-96 hours): Clinical hepatitis and potential liver failure.
Stage IV (5 days or deyond): Recovery or multiple organ failure.

Diagnosing Paracetamol Overdose
Diagnosis involves measuring serum acetaminophen levels as soon as possible.
The Rumack-Matthew nomogram is used to assess the risk of liver damage.
Additional tests like PT, AST, and ALT are ordered if poisoning is confirmed.
Always consider paracetamol overdose, even if accidental ingestion seems unlikely.

Treatment of Paracetamol Overdose
The primary treatment is N-Acetylcysteine (NAC), most effective within 8 hours of ingestion.
NAC can be administered orally or intravenously.
Activated charcoal may be used in acute cases if paracetamol is still in the GI tract.
Severe cases with liver failure might require a liver transplant.

Importance of Early Detection
Early detection is crucial because the sooner an overdose is identified, the more effective the treatment.
Administering NAC within 8 hours can significantly reduce the risk of severe liver damage.
Quick action can save lives and prevent long-term health issues.

Role of N-Acetylcysteine (NAC)
NAC replenishes glutathione levels in the liver, neutralizing the toxic metabolite NAPQI.
This prevents further liver damage and supports recovery.
NAC can be given orally or intravenously, depending on the severity of the overdose.

Using the Rumack-Matthew Nomogram
The Rumack-Matthew nomogram assesses the risk of liver toxicity in paracetamol overdose.
It plots serum acetaminophen levels against the time since ingestion.
This tool helps healthcare providers determine the likelihood of hepatotoxicity and decide on treatment.

Activated Charcoal in Overdose Management
Activated charcoal is used in acute overdose cases if paracetamol is still in the gastrointestinal tract.
It binds to the drug, preventing its absorption into the bloodstream.
This can reduce the amount of paracetamol that reaches the liver.

Long-Term Outcomes of Paracetamol Poisoning
Long-term outcomes depend on the severity of the overdose and the timeliness of treatment.
If treated promptly, many patients recover fully.
Severe cases can lead to chronic liver damage or failure, requiring ongoing medical care or a liver transplant.
Early intervention is key to improving outcomes.