Clarithromycin-Induced Long QT Syndrome: A Case Report

Table 1

Diagnostic criteria for LQTS.

ECG findings
cQT
≥480 msec	3 points
460–470 msec	2 points
450 msec (in males)	1 points
Torsade de pointes	2 points
T-wave alternans	1 points
Notched T wave in 3 derivation	1 points
Low heart rate for age	0.5 points
Clinical history
Syncope
With stress	2 points
Without stress	1 points
Congenital deafness	0.5 points
Family history
Siblings with LQTS	1 points
History of sudden death before 30 years of age	0.5 points