Monitoring and Management of Paracetamol Poisoning

Initial Assessment and Monitoring

The American College of Critical Care Medicine recommends systematic monitoring of hepatic function, coagulation status, encephalopathy grade, metabolic parameters, and multi-organ function in patients with paracetamol poisoning, with blood glucose checks at least every 2 hours and frequent assessment of mental status to guide prognosis and treatment decisions 1, 2
Serum paracetamol level should be obtained even if treatment has already begun to confirm diagnosis and assess severity 1, 2
Coagulation parameters, including PT/INR and Factor V levels, should be monitored, with a PT ratio <50% defining severe acute liver failure 1, 2
Arterial blood gas and lactate should be monitored, with an arterial pH <7.3 after adequate volume resuscitation being a poor prognostic indicator and transplant criterion 3
Blood glucose must be monitored at least every 2 hours due to the risk of hypoglycemia from hepatic dysfunction 1, 2, 3

Encephalopathy grade assessment using the West Haven criteria is more valuable than ammonia measurements for monitoring disease progression 2, 4
Serum sodium should be maintained between 140-145 mmol/L to prevent cerebral edema 1, 2, 3
Transcranial Doppler ultrasound should be used for patients with advanced encephalopathy to assess intracranial pressure 1, 2
The Glasgow Coma Scale should be used to assess mental status, with tracheal intubation and sedation indicated when GCS <8 1, 2
Volume status assessment should be performed to evaluate cardiac output and both right and left-sided cardiac function 1, 2, 3
Blood pressure should be monitored, with norepinephrine used for refractory hypotension to maintain perfusion 1, 2, 3
Fluid balance should be monitored, with crystalloid fluids being the first choice for expansion 1, 2, 3
Urine output and creatinine trends should be monitored, with acute renal failure commonly developing and potentially requiring renal replacement therapy 1, 2, 3
Nephrotoxic drugs, including NSAIDs, should be avoided 2, 3

N-acetylcysteine should be started immediately without waiting for serum paracetamol results in suspected cases (GRADE 1+ recommendation) 5, 6, 7
Prognostic assessment for transplant consideration should be performed, with poor prognostic indicators including arterial pH <7.3 after adequate volume resuscitation, PT >100 seconds with serum creatinine >3.4 mg/dL in patients with grade III/IV coma, and higher grades of encephalopathy (III-IV) 1, 3

Blood glucose should be monitored every 2 hours minimum 1, 2, 3
Mental status should be monitored frequently, with more value than repeated ammonia levels 4
Coagulation parameters should be monitored daily or more frequently if deteriorating 1, 2
Liver transaminases and creatinine should be monitored daily 1, 2
Arterial blood gas and lactate should be monitored as clinically indicated, particularly if deterioration 1, 2

The American Association for the Study of Liver Diseases recommends immediate referral for liver transplantation evaluation in patients with acetaminophen-induced acute liver failure who have hepatic encephalopathy, coagulopathy (INR >2.0), and acute kidney injury, as these criteria indicate a poor prognosis despite ongoing N-acetylcysteine therapy 8
Early transplant center contact is mandated for patients with acute liver failure who meet poor prognostic criteria, such as King's College Criteria components, to improve outcomes 8

The American Association for the Study of Liver Diseases guidelines suggest that patients with INR >2.0, encephalopathy, and acute kidney injury should be immediately referred for transplant evaluation 8
Preparation for transfer to a transplant center ICU for higher level of care is recommended for patients with severe liver failure, as 20% of listed patients die awaiting transplant 8