Table 2

Indication for surgery in relation to preoperative invasive study and age at surgery

	PH Qp:Qs > 2	PH without information on Qp:Qs	PH Qp:Qs = 1.5–1.99	Borderline case of PH	Qp:Qs > 2 without PH^2-151	Qp:Qs = 1.5–1.99 without PH^2-152	AR without PH or information about Qp:Qs^2-153	CHF and restrictive VSD	Misc^2-154	Total
Number of children
1976–90	76	4	5	1	20	2	1	0	1	110
1991–96	24^2-165	36^2-165	2	14^2-160	32	30^2-165	9	12^2-160	8	167
Total	100	40	7	15	52	32	10	12	9	277
Invasive studies
1976–90	76	4	5	1	20	2	0	0	1	109
1991-96	24	2^2-165	2	0^2-165	5^2-165	7^2-150	1	0	2	43^2-165
Total	100	6	7	1	25	9	1	0	3	152
Median age at surgery
1976–90	11.4 months	1 year	1.1 years	1.1 years	4.1 years	9.4 years	6.1 years		4.4 years	1.1 years
1991–96	1.4 years	3.5 months	1.2 years	6.6 months	4.2 years	6.5 years	4.2 years	7.2 months	2.1 years	1.6 years
Total	11.6 months	3.7 months	1.1 years	6.8 months	4.2 years	6.5 years	5 years	7.2 months	2.2 years	1.3 years

↵2-150 p < 0.05;
↵2-160 p < 0.01;
↵2-165 p < 0.001.
↵2-151 15 borderline PH, 6 no relevant information about PH.
↵2-152 5 borderline PH, 6 no relevant information about PH.
↵2-153 2 borderline PH, 1 no relevant information about PH.
↵2-154 Closed during primary surgery for mitral regurgitation (1); preoperative diagnosis was sinus valsalvae aneurysm with Qp:Qs = 1.8, aortic regurgitation and no PH (1); perimembranous VSD with a large estimated shunt (1); perimembranous VSD with persistent ductus arteriosus and mitral regurgitation (1); restrictive VSD (4), of which 1 affected the aortic cusp, 1 tissue tag in left ventricular outflow tract, 1 perimembranous with extension to the outflow tract, and 1 without signs of closure where the right chamber pressure was first measured to 4 mm Hg; immigrant child with previous PH.
Time periods were chosen because of availability of colour Doppler after 1991.
PH, pulmonary hypertension; AR, aortic regurgitation; CHF, congestive heart failure; VSD, ventricular septal defect.