. Author manuscript; available in PMC: 2013 Dec 1.

Published in final edited form as: J Pediatr. 2012 Jun 28;161(6):1126–1131.e2. doi: 10.1016/j.jpeds.2012.05.050

Table 2. Conventional echocardiographic characteristics of children with idiopathic PAH and healthy controls.

Variables	Idiopathic PAH	Healthy control
	(n=51)	(n=51)	p value
	mean +/− SD	mean +/− SD	p value
RV internal dimension in diastole (mm)	23.5+/−6.0	18.1+/−4.9	< 0.001
LV internal dimension in diastole (mm)	37.7+/−5.8	43.6+/−6.8	< 0.001
LV internal dimension in systole (mm)	20.2+/−5.5	27.1+/−4.8	< 0.001
LV fractional shortening (%)	47.1+/−10.9	37.4+/−4.3	< 0.001
RV myocardial performance index	0.63+/−0.30	0.21+/−0.10	< 0.001
LV myocardial performance index	0.43+/−0.16	0.36+/−1.69	0.50
Acceleration time/ejection time (RV outflow)	0.3+/−0.1	0.4+/−0.1	< 0.001
LV E velocity (cm/s)	77.7+/−19.8	97.0+/−17.9	< 0.001
LV E/A ratio	1.4+/−0.5	2.4+/−0.9	< 0.001
RV E velocity (cm/s)^*	53.6+/−12.9	63.1+/−15.9	< 0.001
RV E/A ratio^*	1.1+/−0.5	2.2+/−0.6	< 0.001
Tricuspid regurgitant velocity (m/s)^¶	4.1+/−0.8	2.2+/−0.2	< 0.001

LV; left ventricular, PAH; pulmonary arterial hypertension, RV; right ventricular, SD; standard deviations

46 cases (RV E and A velocity were not available in 5 children with PAH)

^¶

27aaees (TR eeloctty was not aaailable in 24 heal thy contols)