Emergency & trauma

Canadian Syncope Risk Score

30-day serious-outcome risk stratification after a completed ED syncope assessment.

Intended population: Age ≥16, syncope within 24 hours; no serious cause identified during the ED evaluation.

Not a substitute for ED evaluation or a rule for all transient loss of consciousness. Disposition requires the complete assessment.
Missing ECG or troponin results are not normal results. Enter verified results; this implementation does not impute unmeasured tests.

Age (years)

Completed ED syncope evaluation with no serious underlying cause identified?

Loss of consciousness >5 minutes, persistent mental-status change, seizure, head trauma causing loss of consciousness, major injury requiring admission, intoxication, or unreliable history?

Predisposition: warm/crowded place, prolonged standing, fear, emotion, or pain?

Known coronary/valvular disease, cardiomyopathy, heart failure, arrhythmia, or implanted rhythm device?

Any ED systolic BP <90 or >180 mm Hg?

Troponin above assay 99th percentile?

QRS axis (degrees)

QRS duration (ms)

Corrected QT interval (ms)

ED clinician's syncope diagnosis

Sources and scoring references

Original CSRS development (2016) ↗Multicenter CSRS validation (2020) ↗

Implementation references reviewed October 28, 2026. Verify applicability and unusual or treatment-changing results against the linked references and local guidance.