Congenital Disorders V

Cardiovascular System


{"ops":[{"insert":"10 hours after delivery, a newborn develops cyanosis and respiratory distress. He was delivered at term after an uncomplicated pregnancy. His birth weight was 3000 g (6 lb 10 oz), and Apgar scores were 8 and 9 at 1 and 5 minutes, respectively. On examination, his temperature is 37 degrees \u02daC (98.6 \u02daF), pulse is 160\/min and respirations are 70\/min. His blood pressure is 90\/50 mm Hg in the right arm. Examination shows moderate subcostal retractions and nasal flaring. Cardiac examination shows a single loud S2 with no murmur. Electrocardiogram (ECG) is within normal limits. Chest x-ray shows mediastinal narrowing with an egg-shaped heart; lung fields are clear. Which of the following is the most likely cause of these findings?"},{"insert":"\n"}]}

Background

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(A)

Origin of aorta from right ventricle
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(B)

Absence of tricuspid valve
{"ops":[{"insert":"\n"}]}

(C)

Right ventricular outflow tract obstruction
{"ops":[{"insert":"\n"}]}

(D)

Emptying of pulmonary veins into right atrium
{"ops":[{"insert":"\n"}]}

(E)

Single artery originating from both ventricles
{"ops":[{"insert":"\n"}]}

References

{"ops":[{"insert":"Bernstein, Daniel. d-Transposition of the Great Arteries [online]. Nelson Textbook of Pediatrics, 2020 [viewed 15 September 2019]. Available from: https:\/\/www.us.elsevierhealth.com\/nelson-textbook-of-pediatrics-2-volume-set-9781455775668.html"},{"insert":"\n","attributes":{"list":"ordered"}},{"insert":"RAO PS. Management of Congenital Heart Disease: State of the Art-Part II-Cyanotic Heart Defects. Children (Basel) [online] 2019 Apr 4 [viewed 15 September 2019] Available from: http:\/\/www.ncbi.nlm.nih.gov\/pubmed\/30987364"},{"insert":"\n","attributes":{"list":"ordered"}}]}

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