http://www.appliedradiology.com RSS Feed on Applied Radiologyhttp://www.appliedradiology.com//Pediatric-congenital-heart-disease.aspx<p>A full-term infant boy was delivered at 39-weeks gestational age to a 35-year-old woman via spontaneous vaginal delivery and then transferred to the Children’s Hospital due to a prenatal diagnosis of congenital heart disease. Delivery went well with no complications. Apgars were 8 at 1 min and 9 at 5 min. Physical examination showed a 2.9-kg infant with normal heart rate of 120 and respirations of 30. He was in no distress and was only slightly dusky in appearance, but not cyanotic. The baby had relatively high oxygen saturations at less than 1 hour of life (oxygen saturation of 92% on room air) and had been on room air since delivery. Physical examination was otherwise unremarkable. <br /><br /> After delivery, an echocardiography was performed. A chest computed tomography (CT) scan was performed on day 5 of life prior to surgical repair of the heart disease. The study was performed on a Somatom Definition AS 64-row scanner (Siemens, Forscheim Germany). Images were obtained following administration of 6 mL of Optiray-320 nonionic contrast material (Covidien, St. Louis, MO). The acquisition parameters were 0.6-mm collimation, 56-auto mAs, 80-auto kV, a pitch of 1, and a 0.33-sec scan time. CT dose index (CTDI) volume was 0.93 mGy and dose length product (DLP) was 12m Gy·cm. Using the conversion factor (0.039 mSv/(mGy·cm))¹ for chest examinations on day 1, effective dose (E) is estimated to be 0.47 mSv (12m Gy·cm x 0.039). On day 12 of life, the infant underwent repair of the congenital heart defect and repair of associated long-segment tracheal stenosis.</p>Tuesday, 26 Apr 2011 12:33:26 GMT