الفهرس 
Material and methodsOnly 14 pages are availabe for public view
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Abstract
In the present work we found that the preterm infants
values for YCF were high and those for wall stress were low, as
compared to full term but the differences were not significant.
So the preterm infants had a higher pump function at low after
load. There was a significant -ve correlation between wall stress
and yeF in preterm and fullterm infants. Also the complicated
group of preterm had higher YCF and lower ESWS (when
compared with full term group or non complicated preterm
group).
A linear regression relating the YCF and wall stress was
relatively steeper in non complicated preterm group compared
with full term so the preterm infant particulary non complicated
group could have greater sensitivity to changes in after load and
this may be useful in managing neonates. Such information is
also helpful in monitoring responses to inotropic agents or drugs
affecting after load.
The present work demonstrated that the mean pulmonary
artery pressure of preterm infants was significant higher than
.those with fullterm while the right ventricular function
expressed by ejection fraction was significant lower in
.complicated group of preterm than full term infants.
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So the VCFc-end systolic wall stress relation is useful in
estimation of left ventricular ’contractile state non-invasively.
AIso the left ventriculer performance in preterm infant is subject
to sudden deterioration in the face of increased after load
particulary non complicated group.
So we conclude that hypotension of preterrn particulary
non complicated group not only require fluids, dopamine or
dobutamine administration but also could be improve by use of
vasodilators as sodium nitroprussid for after load reduction.
Also further studies are needed to follow up outcome ofleft
ventricular contractile state in preterm infants.