A patient with RDS has alveolar hypoxia and pulmonary vasoconstriction. How will this affect his blood flow?
1. Blood shunts through the foramen ovale
2. Increased systemic blood flow
3. Blood shunts through the ductus arteriosus
4. Decreased blood flow to the gut
a. 2, 4
b. 1, 3
c. 1, 2, 3
d. 1, 2, 3, 4
B
As a consequence of alveolar hypoxia, the neonate can develop pulmonary vasoconstriction and transient pulmonary hypertension. This will lead to a right-to-left shunt as blood flows through the foramen ovale and ductus arteriosus. This results in a partial return to fetal circulation. There is no change in systemic blood flow and flow to the gut.
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