Long QT Syndrome (LQTS) Diagnostic Criteria (1993) Table

Long QT Syndrome (LQTS) Diagnostic Criteria (1993) Table:

Legend:

* - In the absence of medications or disorders known to affect these electrocardiographic features.

† - QTc calculated by Bazett's formula where QTc=QT/RR(square root).

‡ - Mutually exclusive

§ - Resting heart rate below the second percentile for the age.

|| - Mutually exclusive

¶ - The same family member cannot be counted in A and B.

# - Definite LQTS is defined by an LQTS score of more than 3 (≥ 4).

Diagnostic Scoring:

• less than or equal to 1 point - low probability of LOTS.
• 2 to 3 points - intermediate probability of LOTS.
• > 4 points - high probability of LOTS.

Reference:

PJ Schwartz, AJ Moss, GM Vincent and RS Crampton. Diagnostic criteria for the long QT syndrome. An update. Circulation 1993;88;782-784

Tags: Bazett's formula - Congenital Deafness - Long QT Syndrome - LQTS - QTc - QT Interval - Stress - Sudden Cardiac Death - Sudden Death - Syncope - Torsade de Pointes - T-wave Alternans - Ventricular Tachyarrhythmias

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