Abstract
Between 30 and 40% of ventilated babies of less than 1500 gm birth weight will develop a persisting patency of the ductus arteriosus (PDA) significant enough to interfere with their respiratory management. Its occurrence has been linked to long term respiratory and neurological morbidity. 1 Ultrasound technology has made diagnosis of this problem considerably more accurate, however there is still uncertainty surrounding when to use this technology and more importantly how to interpret the results and when to act to medically or surgically close a PDA. 2
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