Short QT Syndrome - Diagnosis

Diagnosis

Recent diagnostic criteria have been published out of the Arrhythmia Research Laboratory at the University of Ottawa Heart Institute from Drs. Michael H Gollob and Jason D Roberts.

The Short QT Syndrome diagnostic criteria is based on a point system as follows:

QTc in milliseconds

<370 1 <350 2 <330 3

Jpoint-Tpeak interval

<120 1

Clinical History

Sudden cardiac arrest 2 Polymorphic VT or VF 2 Unexplained syncope 1 Atrial fibrillation 1

Family History

1st or 2nd degree relative with SQTS 2 1st or 2nd degree relative with sudden death 1 Sudden infant death syndrome 1

Genotype

Genotype positive 2 Mutation of undetermined significance 1 in a culprit gene

Patients are deemed high-probability (> or equal to 4 points), intermediate probability (3 points) or low probability (2 or less points).