Table 3 Patients’ data and CRT effects according to systemic ventricular anatomy (patients with CRT and concurrent cardiac surgical procedure excluded)

Patients’ data	Systemic LV (n = 62)	Systemic RV (n = 27)	p Value*
Age at CRT (years), median	13.3	28.8	0.002
Follow-up on CRT (months), median	8.6	7.3	0.965
Initial QRS (ms), median	160	160	0.722
Initial SVEDD (z score), median	4.7	2.1	0.002
Initial EF/FAC (%), mean (SD)	30.6 (15.8)	28.8 (10.0)	0.723
Initial SAVV regurgitation (grade) (median)	1	2	0.025
Initial NYHA class (median)	3.0	2.0	0.215
Change in QRS (ms), median	−40§	−21§	0.877
Change in SVEDD (z score), median	−2.1§	−0.5	0.039
Change in EF/FAC (%), mean (SD)	+13.3 (14.7)§	+7.2 (9.9)¶	0.195
Change in SAVV regurgitation (grade), median	−1§	−1¶	0.600
Change in NYHA class (median)	−1.0§	−1.0‡	0.380
Non-responders	11/54	3/22	0.745

*Significance levels across diagnostic categories; significance levels inside diagnostic categories pre- vs post-CRT: ‡p<0.005; §p<0.001; ¶p<0.05.
CRT, cardiac resynchronisation therapy; EF, ejection fraction; FAC, fractional area of change; LV, left ventricle; NS, non-significant; NYHA, New York Heart Association; RV, right ventricle; SAVV, systemic atrioventricular valve; SVEDD, systemic ventricular end-diastolic dimension.