Table 1.

Individual Characteristics and T‐wave Loop Parameters of the Short QT Syndrome Subjects and Controls

Parameters	F1‐1	F1‐2	F1‐3	F2‐4	F2‐5	F2‐6	F2‐7	F3‐8	F3‐9	F3‐10	Control Population
Age	35	31	6	51	39	49	21	19	50	82	51 ± 6 years
Sex	M	F	F	M	M	M	M	M	M	M	M: 48.3%
QT	320	240	240	300	320	320	320	280	310	280	—
QTc	292*	262*	279*	335*	345*	358*	330*	313*	307*	280*	405 (399.2–412.2)
Mutation	HERG	HERG	HERG	HERG	HERG	HERG	HERG	Not defined	Not defined	Not defined
Symptoms	Syncope	Pre‐syncope	Aborted SCD	Syncope	Syncope	——	——	Aborted SCD	VT	——
T‐wave amplitude V2	1.89*	0.71*	0.39*	1.19*	1.03*	1.43*	1.11*	1.30*	1.05*	0.61*	0.50 (0.44–0.55)
TCRT	0.85*	−0.44*	−0.21*	0.15*	−0.22*	0.26	0.63*	−0.13*	−0.95*	0.84*	0.36 (0.25–0.47)
Width	1.48	0.59	0.39	0.73	0.54	0.87	0.61	0.75	0.56	0.57	3.98 (0–10.65)
Height	0.24*	0.30*	0.18*	0.44*	0.26*	0.26*	0.18*	0.23*	0.28*	0.22*	0.14 (0.13–0.16)
Ratio	0.16*	0.50	0.47	0.60*	0.48	0.30*	0.29*	0.30*	0.50	0.39	0.43 (0.32–0.53)
TWLD	36	35*	41*	36	35*	35*	36	33*	39*	34*	37 (36–38)

M = male; F = female; SCD = sudden cardiac death; VT = ventricular tachycardia; QT and QTc (ms); TCRT = total cosine R‐to‐T; Width = width of the T‐wave loop; Height = height of the T‐wave loop; Ratio = ratio of the T‐wave loop height and width; TWLD = T‐wave loop dispersion. *= Value outside of the control population 99% confidence interval.