Maddrey Discriminant Function Calculator
Calculate Maddrey Discriminant Function (MDF) to assess the severity of alcoholic hepatitis and determine the need for corticosteroid therapy.
Calculate MDF Score
Normal range: 11-13.5 seconds
Laboratory control value (typically 12-13 seconds)
Normal range: 0.1-1.2 mg/dL
Formula and Interpretation
Formula
MDF = 4.6 × (PT patient - PT control) + Bilirubin (mg/dL)Interpretation
Mild to moderate alcoholic hepatitis. Mortality without treatment is relatively low. Conservative management with nutritional support, alcohol cessation, and treatment of complications is appropriate.
Severe alcoholic hepatitis with high short-term mortality (35-45% at 28 days without treatment). Consider corticosteroid therapy (prednisolone 40mg daily for 28 days) if no contraindications exist.
Clinical Management of Alcoholic Hepatitis
Conservative Management (MDF < 32)
- •Alcohol cessation counseling and support
- •Nutritional support (high-calorie, high-protein diet)
- •Treat vitamin deficiencies (thiamine, folate, multivitamins)
- •Manage complications (ascites, encephalopathy, infection)
- •Screen for hepatocellular carcinoma if cirrhosis present
Corticosteroid Therapy (MDF ≥ 32)
- •Prednisolone 40mg PO daily for 28 days
- •Monitor for response at day 7 (Lille score)
- •Discontinue if Lille score ≥0.45 (non-responder)
- •Continue all supportive measures as above
- •Consider early liver transplant evaluation if eligible
Contraindications to Corticosteroids
Absolute Contraindications
- •Active gastrointestinal bleeding
- •Active infection (including bacterial peritonitis, pneumonia, sepsis)
- •Acute pancreatitis
- •Renal failure (creatinine >2.5 mg/dL)
- •Hepatitis B or C coinfection (relative)
Precautions
- •Screen for infections before starting therapy
- •Consider prophylaxis for Pneumocystis jirovecii if prolonged therapy
- •Monitor blood glucose (diabetes risk)
- •Assess for occult GI bleeding
Understanding the Maddrey Discriminant Function
History and Development
The Maddrey Discriminant Function (MDF), also known as the Modified Discriminant Function, was developed by Dr. Willis Maddrey in 1978. It was one of the first scoring systems to identify patients with severe alcoholic hepatitis who would benefit from corticosteroid therapy.
Clinical Significance
The MDF remains widely used because:
- Simple calculation using readily available laboratory values
- Well-validated cutoff (≥32) for identifying severe disease
- Proven benefit of corticosteroids in severe cases (MDF ≥32)
- Helps stratify patients for clinical trials
Mortality Rates
Without treatment, patients with severe alcoholic hepatitis (MDF ≥32) have a 28-day mortality of 35-45%. Corticosteroid therapy reduces this to approximately 20-25% in responders. The Lille score at day 7 helps identify non-responders who should discontinue therapy.
Alternative Treatments
For patients with contraindications to corticosteroids or non-responders:
- Pentoxifylline 400mg TID (though recent studies show limited benefit)
- N-acetylcysteine as adjunct to corticosteroids
- Early liver transplant evaluation (6-month abstinence rule being reconsidered)
- Intensive nutritional support with enteral feeding if needed
Frequently Asked Questions
What is the Maddrey Discriminant Function?
The Maddrey Discriminant Function (MDF) is a scoring system that uses prothrombin time and bilirubin levels to assess the severity of alcoholic hepatitis. An MDF score ≥32 indicates severe disease that may benefit from corticosteroid treatment.
Why is PT used instead of INR?
The original Maddrey formula uses prothrombin time (PT) in seconds rather than INR because it was developed before INR standardization. The formula requires the difference between patient PT and control PT, making it specific to each laboratory's reagents.
How effective are corticosteroids in severe alcoholic hepatitis?
Multiple studies have shown that corticosteroids reduce 28-day mortality in severe alcoholic hepatitis (MDF ≥32) by approximately 40-50%. However, about 40% of patients don't respond to therapy, which can be identified early using the Lille score.
What is the Lille score and when should it be checked?
The Lille score is calculated after 7 days of corticosteroid therapy to assess treatment response. A score <0.45 indicates response (continue therapy), while ≥0.45 indicates non-response (discontinue steroids and consider alternatives).
Can patients with MDF <32 still have severe disease?
Yes. While MDF <32 generally indicates milder disease, patients can still have serious complications including ascites, encephalopathy, or infection. Clinical judgment and other scoring systems (MELD, Lille) should also be considered.
How long should corticosteroid therapy continue?
The standard regimen is prednisolone 40mg daily for 28 days, followed by either abrupt discontinuation or a short taper. Longer courses have not shown additional benefit and may increase infection risk.
What role does nutrition play in alcoholic hepatitis?
Malnutrition is common and worsens prognosis. Patients should receive 35-40 kcal/kg/day with 1.2-1.5 g/kg/day protein. Enteral feeding should be considered if oral intake is inadequate. Supplementation of thiamine, folate, and other vitamins is essential.
Is liver transplant an option for alcoholic hepatitis?
Early liver transplantation is increasingly considered for carefully selected patients with severe alcoholic hepatitis who don't respond to medical therapy. Traditional 6-month abstinence requirements are being reconsidered, though careful psychosocial evaluation remains critical.
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