Short QT Syndrome:Diagnostic Alogarithm
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Transcript of Short QT Syndrome:Diagnostic Alogarithm
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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