Canadian Syncope Risk Score
CSRS · RISK STRATIFICATION
CSRS Assessment
Predicts 30-day serious adverse events in patients ≥16 yrs presenting ≤24h of syncope.
Do not use if: prolonged (>5 min) LOC, altered mental status, witnessed seizure, major trauma, intoxication, language barrier, or head trauma causing LOC. This tool supports clinical assessment only.
Predisposition to vasovagal symptoms
Triggered by being in a warm crowded place, prolonged standing, fear, emotion, or pain
±1
Heart disease history
CAD, atrial fibrillation or flutter, CHF, valvular disease
±1
sBP <90 or >180 mmHg
On any reading
±2
Elevated troponin
>99th percentile of normal population
±2
Abnormal QRS axis
<-30° or >100°
±1
QRS duration >130 ms
Prolonged QRS
±1
Corrected QT interval >480 ms
Prolonged QTc
±2
ED diagnosis
Based on ED evaluation
dx
Risk score
Select responses above — your risk score updates automatically.
Risk tiers
≤ -2Very low
-1 to 0Low
1–3Medium
≥ 4High
For reference only — verify against current protocol.