How a patent ductus arteriosus effects the premature lamb's ability to handle additional volume loads.

Abstract:

:A model of patent ductus arteriosus in premature lambs was created to examine the lamb's ability to handle the volume load imposed by a patent ductus arteriosus and to determine the lamb's ability to handle any additional volume load. Fifteen preterm lambs [133 +/- 2 (+/- SD) days gestation, term 145 days], whose ductal diameter could be regulated with a mechanical occluder, were studied to determine the independent effects of ductus patency and a saline volume load (50 ml/kg over 3 min) on left ventricular output and its distribution. During a saline infusion, preterm lambs with a closed ductus could only increase their stroke volume by 40% above baseline stroke volume. When challenged with a saline infusion, lambs with an open ductus still were able to increase their stroke volume significantly; the maximal increase in stroke volume during the saline load with the ductus open was 70% above baseline stroke volume. We hypothesize that the associated reduced left ventricular afterload plays a significant role in the preterm lamb's ability to increase its stroke volume when challenged with a patent ductus arteriosus. Even with a patent ductus arteriosus, the lamb still has the ability to handle additional volume loads.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Clyman RI,Roman C,Heymann MA,Mauray F

doi

10.1203/00006450-198711000-00012

subject

Has Abstract

pub_date

1987-11-01 00:00:00

pages

531-5

issue

5

eissn

0031-3998

issn

1530-0447

journal_volume

22

pub_type

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