Clinical Scorecard: Looking Beyond Discrimination in Prehospital Scores to Improve Patient Outcomes

At a Glance

Key Highlights

• mSOFA ranges from 0 to 17, with a threshold of 5 used to identify high acuity; a multicenter validation reported an AUROC of 0.944 for two-day mortality.
• In a prospective multicenter study of 16,106 patients, 85 patients who died had mSOFA below 5.
• Among false-negative patients, lactate and GCS had a strong positive association (Spearman’s ρ = 0.616), consistent with but not establishing occult hypoperfusion.
• For patients with mSOFA below 5, OHI at a threshold of 3.38 detected 73 of 85 deaths and increased sensitivity for two-day mortality from 90.9% to 98.7%.
• In the low-mSOFA subgroup, OHI specificity was 77.0% and mortality positive predictive value was 2.4%; approximately 3,000 additional survivors screened positive.

Guideline-Based Recommendations

Diagnosis

• The article describes mSOFA as a 0–17 score based on mean arterial pressure, GCS, oxygenation, creatinine, and lactate; mSOFA ≥5 is the high-acuity threshold.
• The proposed OHI is lactate × (16 − GCS); 3.38 was selected empirically in the derivation cohort as the positive-screen threshold.

Management

• The article proposes a sequential approach: classify patients with mSOFA ≥5 as high acuity and consider OHI as a secondary screen for those with mSOFA <5.
• For an OHI-positive patient, the article proposes considering intensified monitoring, an appropriately equipped receiving center, and early pre-arrival notification.
• The article states that prospective evaluation is needed to determine whether formal OHI calculation improves care.

Monitoring & Follow-up

• The article suggests closer observation and expedited clinical reassessment when an alert patient has unexpectedly high lactate, including in the emergency department.
• Further work should assess whether OHI positivity predicts early hospital resource use and time-critical treatment.

Risks

• In the low-mSOFA subgroup, OHI screening had a mortality positive predictive value of 2.4%, and roughly 3,000 additional survivors screened positive.
• In the Austrian validation, OHI detected four of five deaths missed by mSOFA; the small number of deaths limits certainty.
• The article notes that mortality alone may not capture the operational value of a secondary screen; whether additional positive screens represent unnecessary activation or identification of critical illness remains to be assessed.

Patient & Prescribing Data

The evidence concerns patients assessed in prehospital emergency care, including a prospective multicenter cohort of 16,106 patients and a geographically separate Austrian cohort of 829.

No medication or treatment regimen is specified. OHI is proposed as a secondary risk screen to inform consideration of monitoring, receiving-center capability, and pre-arrival notification.

Clinical Best Practices

• Assess score performance by examining patients missed by the model, not only overall discrimination.
• Interpret OHI as a proposed secondary screen, not as a confirmed diagnosis of occult hypoperfusion.
• Do not assume an OHI-positive result is over-triage solely because the patient does not die; the article calls for evaluation of resource use and time-critical treatment.
• Treat the proposed emergency-department application as requiring prospective evaluation.

Related Resources & Content

• Source article: Looking Beyond Discrimination in Prehospital Scores to Improve Patient Outcomes