Proposed diagnostic criteria for short QT syndrome

Criteria	Points
QTc, milliseconds
<370	1
<350	2
<330	3
J_point-T_peak interval <120 milliseconds	1
Clinical history*
History of sudden cardiac arrest	2
Documented polymorphic VT or VF	2
Unexplained syncope	1
Atrial fibrillation	1
Family history*
First- or second-degree relative with high probability of SQTS	2
First- or second-degree relative with autopsy-negative sudden cardiac death	1
Sudden infant death syndrome	1
Genotype*
Genotype positive	2
Mutation of undetermined significance in a culprit gene	1
Total

High-probability SQTS: ≥4 points.
Intermediate-probability SQTS: 3 points.
Low-probability SQTS: ≤2 points.

VF: ventricular fibrillation; VT: ventricular tachycardia; SQTS: short QT syndrome; QT: Bazett corrected QT interval.
* A minimum of 1 point must be obtained in the electrocardiographic section in order to obtain additional points.

Original table modified for this publication. Gollob MH, Redpath CJ, Roberts JD: The short QT syndrome: proposed diagnostic criteria. J Am Coll Cardiol 2011; 57:802. Table used with the permission of Elsevier Inc. All rights reserved.

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Proposed diagnostic criteria for short QT syndrome