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Old 08-15-2011
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Heart Single second heart sound and right ventricular prominence

A 3-day-old infant with a single second heart sound has had progressively deepening cyanosis since birth but no respiratory distress. Chest radiography demonstrates no cardiomegaly and normal pulmonary vasculature. An electrocardiogram shows an axis of 120 and right ventricular prominence. Which of the following congenital cardiac malformations is most likely responsible for the cyanosis?
  1. Tetralogy of Fallot
  2. Transposition of the great vessels
  3. Tricuspid atresia
  4. Pulmonary atresia with intact ventricular septum
  5. Total anomalous pulmonary venous return below the diaphragm
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Old 08-15-2011
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Originally Posted by usmleman2020 View Post
A 3-day-old infant with a single second heart sound has had progressively deepening cyanosis since birth but no respiratory distress. Chest radiography demonstrates no cardiomegaly and normal pulmonary vasculature. An electrocardiogram shows an axis of 120 and right ventricular prominence. Which of the following congenital cardiac malformations is most likely responsible for the cyanosis?
  1. Tetralogy of Fallot
  2. Transposition of the great vessels
  3. Tricuspid atresia
  4. Pulmonary atresia with intact ventricular septum
  5. Total anomalous pulmonary venous return below the diaphragm

hmmmm A???
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Originally Posted by usmleman2020 View Post
A 3-day-old infant with a single second heart sound has had progressively deepening cyanosis since birth but no respiratory distress. Chest radiography demonstrates no cardiomegaly and normal pulmonary vasculature. An electrocardiogram shows an axis of 120 and right ventricular prominence. Which of the following congenital cardiac malformations is most likely responsible for the cyanosis?
  1. Tetralogy of Fallot
  2. Transposition of the great vessels
  3. Tricuspid atresia
  4. Pulmonary atresia with intact ventricular septum
  5. Total anomalous pulmonary venous return below the diaphragm
its 2. Transposition of Great Vessels

USMLE2011, with ToF there is cardiomegaly, which isn't the case here!
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Old 08-15-2011
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transposition of great vessels
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i cant make up my mind between 2 and 3
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Old 08-15-2011
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I have trouble with the congenital heart defects. Any good source to read about these?
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