Short QT syndromeA diagnostic scoring system

Algorithm

Personal HistoryFamily HistoryTake a 12 lead ECGLook at genetic report

Personal History

FEATURES SCORES

History of sudden cardiac arrest 2

Documented PMVT or VF 2

Unexplained syncope 1

Atrial fibrillation 1

Family History

FEATURES SCORE

First- or second-degree relative with high probability of SQT

2

First- or second-degree relative with autopsy-negative SCD

1

Sudden infant death syndrome 1

12 lead ECG

Corrected QT interval in ms score

<370 1

<350 2

<330 3

J point peak to T-wave interval<120 msec

1

GENETIC STUDY

GENOTYPE SCORE

Geno type positive 2

Mutation of undetermined significance in a culprit gene

1

Interpretation

A score > 4 indicates high ProbabilityA score > 3 indicates intermediate

probabilityA score > 2 indicates low probability

This scoring system requires at least 1 point from ECG section before evaluating other data

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