USMLE Exam Prep

Category - Free USMLE Practice Test Questions

Which of the following is the most common cause of cyanosis within the first few weeks of life?
  1. Atrial septal defect
  2. Patent ductus arteriosus
  3. Tetralogy of Fallot
  4. Transposition of the great vessels
  5. Ventricular septal defect
Explanation
Answer: C - Tetralogy of Fallot (ToF) is the most common cause of cyanotic CHD.
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