Table 4.

Modified LQTs scoring system.

Findings			Points
ECG	QTc	$\ge$480 ms	3.5
		460 ms–479 ms	2
		450 ms–459 ms	1
		$\ge$ 480 ms in 4th minute of recovery from exercise stress test	1
	Torsades de pointes		2
	T-wave alternans		1
	Notched T-wave in 3 leads		1
	Low hearth rate for age		0.5
Clinical history	Syncope with stress		2
	Syncope without stress		1
Family history	Family member with definitive LQTs		1
	Unexplained SCD in first degree family member at age 30		0.5
Genetic testing	Definitive pathogenic mutation		3.5

ECG, electrocardiogram; QTc, corrected QT interval; LQTs, long QT syndrome; SCD, sudden cardiac death.

Modified from 2022 ESC Guidelines [2].