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Calculate SAPS-II (Simplified Acute Physiology Score II) for ICU patients. Use for mortality prediction, severity assessment, or international ICU benchmarking.
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SOC 職業分類に基づく
| name | sapsii-score |
| description | Calculate SAPS-II (Simplified Acute Physiology Score II) for ICU patients. Use for mortality prediction, severity assessment, or international ICU benchmarking. |
| tier | validated |
| category | clinical |
The Simplified Acute Physiology Score II (SAPS-II) is a severity scoring system developed from a European/North American multicenter study. Calculated from the worst values in the first 24 hours of ICU stay.
In M4Bench, target concept tables listed in the task configuration are removed or unavailable in the agent database. Use this skill as procedural guidance and derive the requested output from available source or intermediate tables; do not rely on a precomputed target table or bundled SQL script.
Use the worst value in the first 24 hours of ICU admission. When both low and high extremes can score, assign the score for the qualifying extreme with the highest SAPS-II point value. Missing components are scored as 0 in M4Bench.
| Component | Value | Points |
|---|---|---|
| Age, years | < 40 | 0 |
| Age, years | 40-59 | 7 |
| Age, years | 60-69 | 12 |
| Age, years | 70-74 | 15 |
| Age, years | 75-79 | 16 |
| Age, years | >= 80 | 18 |
| Heart rate, bpm | < 40 | 11 |
| Heart rate, bpm | 40-69 | 2 |
| Heart rate, bpm | 70-119 | 0 |
| Heart rate, bpm | 120-159 | 4 |
| Heart rate, bpm | >= 160 | 7 |
| Systolic BP, mmHg | < 70 | 13 |
| Systolic BP, mmHg | 70-99 | 5 |
| Systolic BP, mmHg | 100-199 | 0 |
| Systolic BP, mmHg | >= 200 | 2 |
| Temperature, deg C | < 39.0 | 0 |
| Temperature, deg C | >= 39.0 | 3 |
| PaO2/FiO2, if ventilated or CPAP/BiPAP | < 100 | 11 |
| PaO2/FiO2, if ventilated or CPAP/BiPAP | 100-199 | 9 |
| PaO2/FiO2, if ventilated or CPAP/BiPAP | >= 200 | 6 |
| PaO2/FiO2, not ventilated/CPAP/BiPAP | Any value or missing | 0 |
| Urine output, mL/day | < 500 | 11 |
| Urine output, mL/day | 500-999 | 4 |
| Urine output, mL/day | >= 1000 | 0 |
| BUN, mg/dL | < 28 | 0 |
| BUN, mg/dL | 28-83 | 6 |
| BUN, mg/dL | >= 84 | 10 |
| WBC, x10^9/L | < 1.0 | 12 |
| WBC, x10^9/L | 1.0-19.9 | 0 |
| WBC, x10^9/L | >= 20.0 | 3 |
| Potassium, mEq/L | < 3.0 | 3 |
| Potassium, mEq/L | 3.0-4.9 | 0 |
| Potassium, mEq/L | >= 5.0 | 3 |
| Sodium, mEq/L | < 125 | 5 |
| Sodium, mEq/L | 125-144 | 0 |
| Sodium, mEq/L | >= 145 | 1 |
| Bicarbonate, mEq/L | < 15 | 6 |
| Bicarbonate, mEq/L | 15-19 | 3 |
| Bicarbonate, mEq/L | >= 20 | 0 |
| Bilirubin, mg/dL | < 4.0 | 0 |
| Bilirubin, mg/dL | 4.0-5.9 | 4 |
| Bilirubin, mg/dL | >= 6.0 | 9 |
| GCS | < 3 | Treat as missing |
| GCS | 3-5 | 26 |
| GCS | 6-8 | 13 |
| GCS | 9-10 | 7 |
| GCS | 11-13 | 5 |
| GCS | 14-15 | 0 |
| Chronic disease | AIDS | 17 |
| Chronic disease | Hematologic malignancy | 10 |
| Chronic disease | Metastatic cancer | 9 |
| Chronic disease | None of the above | 0 |
| Admission type | Scheduled surgical | 0 |
| Admission type | Medical | 6 |
| Admission type | Unscheduled surgical | 8 |
PaO2/FiO2 Scoring: Only scored for patients on mechanical ventilation OR CPAP/BiPAP. Non-ventilated patients get 0 points for this component.
Mortality Probability: Calculated using:
sapsii_prob = 1 / (1 + exp(-(-7.7631 + 0.0737*sapsii + 0.9971*ln(sapsii+1))))
This 1993 formula tends to overestimate mortality in modern ICU cohorts (calibration drift). Consider recalibration for contemporary populations.
Time Window: Uses worst value from ICU admission to 24 hours after.
MIMIC-IV implementation details:
admissions.admission_type (elective vs not) + surgical service flag from services table.MIMIC-IV limitations:
For eICU, SAPS-II must be calculated from raw tables. 13 of 15 components are straightforward:
| Component | eICU Source |
|---|---|
| Age | patient.age (string; "> 89" for elderly) |
| Heart Rate, Systolic BP, Temperature | vitalperiodic / vitalaperiodic |
| PaO2, FiO2 | lab |
| Ventilation status | respiratorycare / respiratorycharting |
| Urine Output | intakeoutput |
| BUN, WBC, K, Na, HCO3, Bilirubin | lab (text labname, not numeric itemid) |
| GCS | nursecharting |
eICU limitations:
diagnosis table uses free-text diagnosisstring with variably populated icd9code across the 208 sites. ICD-based extraction (AIDS, hematologic malignancy, metastatic cancer) may have incomplete capture. Consider supplementing with pasthistory table or text matching on diagnosisstring.patient.unitadmitsource and service fields.respiratorycare and respiratorycharting tables rather than procedural events.