Table 2 1993–2006 Long QT syndrome (LQTS) diagnostic criteria

ELECTROCARDIOGRAPHIC FINDINGS #

A

QTc^

> 480 ms

3

460 – 470 ms

2

450 – 459 (male) ms

1

B

TORSADE DE POINTES *

2

C

T WAVE ALTERNANS

1

D

NOTCHED T WAVE IN 3 LEADS

1

E

LOW HEART RATE FOR AGE @

0.5

CLINICAL HISTORY

A

SYNCOPE *

WITH STRESS

2

WITHOUT STRESS

1

B

CONGENITAL DEAFNESS

0.5

FAMILY HISTORY $

A

FAMILY MEMBERS WITH DEFINITE LQTS

1

B

UNEXPLAINED SUDDEN CARDIAC DEATH BELOW AGE 30 AMONG IMMEDIATE FAMILY MEMBERS

0.5