Table 7. Comparison of variables between existing syncope rules.

Variables	SFSR (points)	EGSYS (points)	CSRS (points)	ROSE (points)	WF 48 hrs. (Z-score)	WF 30 days (Z-score)
*Abnormal EKG = bradycardia (< 50 beat/minute), ST changes (> 1 mm elevation or depression), QT prolongation (QTC > 480 ms), ventricular tachycardia, atrioventricular block (second or third degree), sick sinus syndrome, ventricular and rapid paroxysmal supraventricular arrhythmias, sinus pauses, and pace malfunction. **Heart disease history = CAD, Heart failure with preserved or reduced ejection fraction, valvular pathology, congenital heart disease, pericardial pathology or any history of arrhythmia. ││Vasovagal predisposition = syncope predisposed by prolonged standing, emotion, pain, fear or being in a crowd.
Hematocrit < 30% or Hb < 9	1 Point			1 point
Systolic pressure < 90 at triage	1 Point		2 Points		2.52
Shortness of breath	1 Point
EKG: non-sinus rhythm/EKG change	1 Point	3 Points			3.32	2.30
Congestive heart failure	1 Point	3 Points	1 Point		3.22
EKG: abnormal*		3 Points				2.30
Supine syncope		2 Points
Autonomic prodrome		-1 Point
Palpitations		4 Point
Effort syncope		3 Point
Heart disease history**		3 Point	1 Point			3.07
Vasovagal predisposition││		-1 Point	-1 Point			-2.59
Elevated troponin			2 Point
QRS duration > 130 ms			1 Point
Corrected QT > 480 ms			2 Point
ED diagnosis (cardiac vs. vasovagal)			2/-2 Points			2.64
Brain natriuretic peptide > 300 pg/mL				1 Point		5.48
Saturation < 94% on room air				1 Point
Bradycardia < 50				1 Point
Fecal occult blood				1 Point
Chest pain				1 Point	2.39
Q waves				1 Point
Antiarrhythmic medication					2.57
EKG: atrial fibrillation/flutter					3.32
Antidepressants						-2.18
Echo: Moderate/Severe pulmonary hypertension						3.36