Predisposition to Vasovagal Syncope

Absent+0Present-1

History of Heart Disease

Absent+0Present+1

Systolic BP at Triage

90–180 mmHg+0< 90 mmHg or > 180 mmHg+2

Troponin Level (>99th Percentile)

Normal (≤ 99th percentile)+0Elevated (> 99th percentile)+2

Abnormal QRS Axis on ECG

Normal (−30° to 100°)+0Abnormal (< −30° or > 100°)+1

QRS Duration on ECG

≤ 130 ms+0> 130 ms+1

Corrected QT Interval (QTc) on ECG

≤ 480 ms+0> 480 ms+2

Emergency Department Diagnosis — Vasovagal Syncope

No+0Yes — diagnosed as vasovagal syncope-2

Emergency Department Diagnosis — Cardiac Syncope

No+0Yes — diagnosed as cardiac syncope+2

Canadian Syncope Risk Score