TABLE 1.

SQTS classification is based on genotype

SQTS subtype	Gene	Channel function	Mechanism
SQTS 1	KCNH2	α‐subunit IKr	Gain function
SQTS 2	KCNQ1	α‐subunit IKs	Gain function
SQTS 3	KCNJ1	α‐subunit IK1	Gain function
SQTS 4	CACNA1C	α‐subunit IL,Ca	Loss function
SQTS 5	CACNB2	Β2‐subunit IL,Ca	Loss function
SQTS 6	CACNA2D1	Δ1‐subunit IL,Ca	Loss function