Table 2.

Characteristics of Different Types of SQTS

Sex	Gene	Mutation	Current	Clinical Symptoms	Supraventricular Arrhythmias	SQTS Type
Female	KCNH2	N588K	IKr	Palpitation	Atrial fibrillation	1
Female	KCNH2	N588K	IKr	None		1
Male	KCNH2	N588K	IKr	Syncope	Atrial fibrillation	1
Female	KCNH2	N588K	IKr	SCD	Atrial fibrillation	1
Female	CaCNA1C	G490R	ICa,L	None		4
Female	CaCNA1C	G490R	ICa,L	Palpitation		4
Male	CaCNA1C	G490R	ICa,L	Palpitation	Atrial fibrillation	4
Male	CaCN2b	C1422T	ICa,L	Syncope SCD	Atrial fibrillation Atrial flutter	5
Male	CaCN2b	C1422T	ICa,L	Syncope		5
Male	CaCN2b	C1422T	ICa,L	None		5
Female	CaCN2b	C1422T	ICa,L	None		5
Female	CaCN2b	C1422T	ICa,L	None		5
Female	CaCN2b	C1422T	ICa,L	None		5

I_Ca,L indicates L‐type calcium; I_Kr, delayed rectifier potassium; SCD, sudden cardiac death; SQTS, short QT syndrome.