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Screening for patent ductus arteriosus.
Irish Medical Journal 2006 September
The aim of our study was to look at the amount of training required to accurately assess ductal patency in very low birth weight infants and to show that this service could be provided by non-cardiologists. Training consisted of an introductory echocardiography course, a CD package, and a total of 3 hours of teaching with a paediatric cardiologist. All of this was accomplished within the 3 months preceding our study. All newborn infants less than 1500 grams or less than 30 weeks gestation had an echocardiogram performed in the first 48 hours of life. A prediction was then made based on the echocardiogram findings as to whether the arterial duct would become a clinically significant one. We based our prediction on established echocardiography criteria for the prediction of ductal patency, namely a ductal diameter of greater than 1.5 millimetres, a left atrial-to-aortic ratio of greater than 1.4, and an abnormal pattern of flow in the distal aorta. In total, 20 very low birth weight infants were screened from March 2005 to June 2005. Fifteen infants did not develop any signs of an arterial duct and this was predicted correctly in 13 cases. Of the 5 infants who developed a clinically apparent duct 4 were predicted correctly, giving us a sensitivity and specificity of 80% and 87%. Our study shows that it is possible to predict ductal patency without extensive echocardiography training. It also shows us that a neonatology based screening programme for pre-symptomatic arterial ducts in very low birth weight infants would be feasible.
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