Tab. 2.

Predictors of appropriate implantable cardioverter-defibrillator therapy in primary preventative therapy of tetralogy of Fallot (0–2 points is low risk, 3–5 points intermediate risk and 6–12 points high risk. Adapted from Khairy et al. [20]). Significant factors on univariate and multivariate analysis are highlighted in italics

	HR	95 % CI	Univariate analysis	Multivariate analysis	Points attributed
Prior palliative shunt	2.6	0.7–9.4	0.13		2
Inducible sustained VT	2.1	0.6–7.6	0.24		2
QRS duration, per 1 ms	1.01	0.99–1.03	0.21
QRS ≥ 180 ms	2.0	0.7–5.9	0.22		1
Ventriculotomy incision	2.4	0.9–6.1	0.071		2
Nonsustained VT	2.7	1.0–7.2	0.053	0.023	2
RV systolic pressure, per 1 mmHg	1.06	1.01–1.11	0.0301
Mean PAP, per 1 mmHg	1.16	1.05–1.35	0.0032
LVEDP, per 1 mmHg	1.21	1.08–1.35	0.0008	0.0039
LVEDP ≥ 12 mmHg	15.1	1.9–123.7	0.0114	0.022	3

HR hazard ratio, CI confidence interval, VT ventricular tachycardia, PAP pulmonary artery pressure, LVEDP left ventricular end diastolic pressure, RV right ventricle