Practice Quiz

NREMT Advanced EMT

Category - Pediatrics and Obstetrics

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Your patient is in the final stages of labor and the umbilical cord has been cut. When does the circulation of the fetus change?
  1. When crowning begins
  2. When the fetus takes it first breath
  3. During the third trimester
  4. Within 6 hours of birth
Explanation
Answer - B - The circulation of a fetus changes when it takes its first breath. As soon as the baby takes a breath, the ambient pressure in the lungs decreases dramatically. Because of this pressure change, the ductus arteriousus closes, diverting blood to the lungs. In addition, the ductus venosus closes, stopping blood flow from the placenta.
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