Table 3.

Short QT syndrome subtypes [86,87,88,89].

SQTS Subtype	Gene	Channel Function	Mechanism
SQTS1	KCNH2	α-subunit IKr	Gain-of-function
SQTS 2	KCNH2	α-subunit IKs	Gain-of-function
SQTS 3	KCNJ2	α-subunit IK1	Gain-of-function
SQTS 4	CACNA1C	α-subunit ICaL	Loss-of-function
SQTS 5	CACNB2	β2-subunit ICaL	Loss-of-function
SQTS 6	CACNA2D1	Δ1-subunit ICaL	Loss-of-function
SQTS 7	SCN5A	α-subunit INa	Loss-of-function
SQTS 8	SLC4A3	AE3 anion exchanger	Loss-of-function

SQTS—short QT syndrome.