Modified child Pugh score
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"Child-Pugh" score liver cirrhosis prognosis
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Modified Child-Pugh score parameters scoring criteria clinical use
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Modified Child-Pugh Score
Background and Historical Development
The scoring system has a three-step evolution:
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Child-Turcotte (1964): Child and Turcotte originally described a classification using 5 parameters - albumin, bilirubin, ascites, encephalopathy, and nutritional status - to stratify surgical risk before portal decompressive surgery.
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Pugh's Modification (1973): R.N.H. Pugh modified the Child-Turcotte system by replacing nutritional status with prothrombin time (PT), as PT was a more objective and reproducible measure of hepatic synthetic function. This modification is what is now called the "Child-Pugh" or "Modified Child-Pugh" score. It was originally developed to assess feasibility of esophageal transection for bleeding varices.
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Further modifications: A creatinine-modified variant adds serum creatinine as a 6th variable to better capture renal dysfunction in decompensated cirrhosis (0 pts if <1.3, 2 pts if 1.3-1.8, 4 pts if >1.8 mg/dL).
The Modified Child-Pugh Score Table
Each of the 5 parameters is scored 1, 2, or 3 based on increasing severity:
| Parameter | 1 point | 2 points | 3 points |
|---|---|---|---|
| Serum Albumin | >3.5 g/dL | 2.8-3.5 g/dL | <2.8 g/dL |
| Serum Bilirubin | <2 mg/dL | 2-3 mg/dL | >3 mg/dL |
| Prothrombin Time (seconds prolonged) | <4 sec | 4-6 sec | >6 sec |
| PT/INR | <1.7 | 1.7-2.3 | >2.3 |
| Ascites | Absent | Slight-Moderate | Tense |
| Hepatic Encephalopathy | None | Grade I-II | Grade III-IV |
Note for cholestatic disease (e.g., primary biliary cirrhosis): Bilirubin elevations are disproportionate. Adjusted scoring: 1 pt for bilirubin <4 mg/dL; 2 pts for 4-10 mg/dL; 3 pts for >10 mg/dL.
Classification
| Class | Total Score | Interpretation |
|---|---|---|
| A | 5-6 | Well-compensated cirrhosis; good hepatic function |
| B | 7-9 | Significant functional compromise; moderate dysfunction |
| C | 10-15 | Decompensated cirrhosis; severe dysfunction |
- Scores 5 to 6 = Class A
- Scores 7 to 9 = Class B
- Scores 10 to 15 = Class C
Clinical Applications
1. Surgical Risk Stratification
- Class A: Surgery generally well tolerated; acceptable perioperative risk
- Class B: Elective surgery generally not recommended; significant risk
- Class C: Elective surgery contraindicated; prohibitive operative mortality
2. Liver Transplantation
- A Child-Pugh score ≥7 (Class B) historically served as the criterion for listing a patient for liver transplantation, indicating decompensation. This role has now largely been taken over by the MELD score.
3. Prognosis in Cirrhosis
The score predicts:
- 1-year and 2-year survival
- Risk of complications such as bleeding varices and spontaneous bacterial peritonitis (SBP)
- Class A: ~100% 1-year survival, ~85% 2-year survival
- Class B: ~80% 1-year survival, ~60% 2-year survival
- Class C: ~45% 1-year survival, ~35% 2-year survival
4. Drug Dosing
Widely used in pharmacokinetic studies and drug labeling to guide dose adjustments in hepatic impairment:
- Mild impairment = Child-Pugh A (score 5-6)
- Moderate = Child-Pugh B (score 7-9)
- Severe = Child-Pugh C (score 10-15)
Limitations
| Limitation | Detail |
|---|---|
| Subjective parameters | Ascites and encephalopathy grading are observer-dependent |
| Ceiling/floor effects | Cannot distinguish finer differences within each class |
| Not continuous | Three broad categories reduce predictive precision |
| Replaced for transplant listing | MELD score (using INR, creatinine, bilirubin) is now standard for organ allocation due to its use of continuous variables and better discrimination |
Comparison: Modified Child-Pugh vs MELD
| Feature | Child-Pugh | MELD |
|---|---|---|
| Variables | 5 (incl. subjective) | 3 (all objective) |
| Scale | 5-15 (categorical A/B/C) | 6-40 (continuous) |
| Renal function | Not included | Creatinine included |
| Use | Surgical risk, drug dosing | Transplant prioritization, short-term mortality |
| Advantage | Simple, widely available | Better short-term mortality prediction |
In severe portal hypertension with preserved hepatic synthetic function, the Child-Pugh score may be more useful than MELD, which focuses on synthetic function.
- Harrison's Principles of Internal Medicine 22E, Table 347-6, p. 2676
- Barash Clinical Anesthesia 9e, Table 46-9 (Modified Child-Pugh Score), p. 3956
- Sabiston Textbook of Surgery, Table 51.1, p. 1042
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