SOFA-1 Score (Classic SOFA)

Sequential Organ Failure Assessment (SOFA) score for evaluating organ dysfunction and estimating mortality risk in critically ill patients.

Respiratory (PaO₂/FiO₂) Coagulation (Platelets ×10³/µL) Liver (Bilirubin mg/dL) Cardiovascular Central Nervous System (Glasgow Coma Scale) Renal (Creatinine mg/dL)

SOFA-1 Score (Classic SOFA)

Sequential Organ Failure Assessment (SOFA) score for evaluating organ dysfunction and estimating mortality risk in critically ill patients.

Respiratory (PaO₂/FiO₂) Coagulation (Platelets ×10³/µL) Liver (Bilirubin mg/dL) Cardiovascular Central Nervous System (Glasgow Coma Scale) Renal (Creatinine mg/dL)

APACHE II

12 acute physiological variables + age + chronic health conditions

Temperature (°C) Mean Arterial Pressure (MAP, mmHg) Heart Rate Respiratory Rate Oxygenation (PaO₂ / A–a Gradient) Arterial pH Sodium (mmol/L) Potassium (mmol/L) Creatinine (mg/dL) Hematocrit (%) White Blood Cell Count (×10³/µL) Glasgow Coma Scale

Age Chronic Health Condition

SAPS II

17 variables – logistic mortality prediction model

Age Heart Rate Systolic Blood Pressure Temperature Glasgow Coma Scale Oxygenation (PaO₂/FiO₂) Blood Urea Nitrogen (mg/dL) Sodium Potassium Bicarbonate Bilirubin White Blood Cell Count Urine Output (24 h) Admission Type Surgery AIDS Hematologic Malignancy

📊 PESI (Pulmonary Embolism Severity Index)

Age (years) Male Sex Cancer Chronic Heart Failure Chronic Lung Disease Heart Rate ≥110 bpm Systolic Blood Pressure <100 mmHg Respiratory Rate ≥30 breaths/min Temperature <36°C Altered Mental Status Oxygen Saturation <90%

📌 Global Pulmonary Embolism Risk Classification

Hemodynamic Instability Right Ventricular Dysfunction Elevated Cardiac Troponins

PLASMIC Score

A seven-component prediction score

Platelet count <30 × 10⁹/L Evidence of hemolysis
Reticulocyte count >2.5%, undetectable haptoglobin, or indirect bilirubin >2.0 mg/dL No active cancer No history of solid-organ or stem-cell transplant MCV <90 fL INR <1.5 Creatinine <2 mg/dL

Total score: 0

Score 0–4 – low risk of severe ADAMTS13 deficiency

Score 0–4 – low risk of severe ADAMTS13 deficiency

Score 5 – intermediate risk of severe ADAMTS13 deficiency

Score 6 or 7 – high risk of severe ADAMTS13 deficiency

Bendapudi PK, Hurwitz S, Fry A, et al. Derivation and external validation of the PLASMIC score for rapid assessment of adults with thrombotic microangiopathies: a cohort study. Lancet Haematol. 2017;4(4):e157–e164.

View clinical background of ICU scoring systems

Clinical Background of ICU Scoring Systems

Scoring systems in the Intensive Care Unit (ICU) are essential tools for assessing the severity of critical illness, estimating mortality risk, and supporting clinical decision-making. They help standardize patient evaluation, improve communication between healthcare teams, and allow comparison of outcomes across institutions.

Purpose of ICU Scoring Systems

These scores are designed to quantify organ dysfunction, identify high-risk patients, and monitor clinical evolution over time. They are especially useful in sepsis, multiorgan failure, acute respiratory failure, shock, and other complex critical illness scenarios.

SOFA (Sequential Organ Failure Assessment)

The SOFA score evaluates six organ systems: respiratory, cardiovascular, hepatic, neurological, renal, and hematologic/coagulation function. Each system is assigned 0 to 4 points, allowing clinicians to identify the degree of organ dysfunction.

SOFA Interpretation

An increase in SOFA score of 2 or more points is associated with a higher risk of mortality and is a key element in the clinical definition of sepsis. Serial SOFA assessment can help evaluate response to treatment and progression of organ failure.

Higher SOFA values reflect greater multiorgan involvement and worse prognosis. However, interpretation should always consider the clinical context, baseline organ function, and the dynamic evolution of the patient.

APACHE II

APACHE II integrates acute physiological variables, age, and chronic health conditions to estimate hospital mortality. It is based on 12 physiological parameters usually assessed during the first 24 hours of ICU admission.

APACHE II Interpretation

Higher APACHE II scores correlate with increased mortality risk. This score is widely used for prognostic assessment, severity adjustment, and comparison of ICU performance across populations.

SAPS II

SAPS II uses a logistic model based on 17 clinical and laboratory variables. It estimates the probability of hospital mortality in critically ill patients and is frequently used for population-level risk adjustment.

Differences Between SOFA, APACHE II, and SAPS II

SOFA is mainly used for sequential monitoring of organ dysfunction, while APACHE II and SAPS II are primarily initial prognostic scores. The most appropriate score depends on the clinical objective: monitoring progression, estimating prognosis, or comparing outcomes.

PESI in Pulmonary Embolism

The Pulmonary Embolism Severity Index (PESI) stratifies mortality risk in patients with acute pulmonary embolism. It can support decisions regarding outpatient management, hospitalization, monitoring intensity, and escalation of care.

Clinical Application of Results

Score results should be integrated with global clinical assessment, including hemodynamic status, organ function, lactate, oxygenation, vasopressor requirement, mechanical ventilation, comorbidities, and response to therapy. Trends over time are often more informative than a single isolated measurement.

In critically ill patients, factors such as sepsis, mechanical ventilation, vasopressor use, renal replacement therapy, bleeding risk, and baseline comorbidities may significantly modify prognosis.

Limitations of Scoring Systems

Although useful, scoring systems do not replace clinical judgment. They may underestimate or overestimate risk in selected populations and should always be interpreted alongside the patient's clinical condition, goals of care, and local protocols.

Clinical Disclaimer

These tools are intended for educational and clinical support purposes. They do not replace medical judgment, clinical guidelines, or individualized patient evaluation. Therapeutic decisions must be adapted to each patient and institutional practice.

References

Vincent JL et al. The SOFA score to describe organ dysfunction/failure.
Knaus WA et al. APACHE II: a severity of disease classification system.
Le Gall JR et al. SAPS II: a simplified acute physiology score.
International critical care and pulmonary embolism guidelines.