A fetus is undergoing a contraction stress test. Uterine contractions are stimulated by the intravenous infusion of oxytocin into the mother. The fetal PO₂ drops below 12 mm Hg and causes the fetal heart rate to slow. Which of the following conditions is likely indicated by this occurrence?

Question

Quizplus · Accepted Answer

During a contraction stress test, FHR levels are monitored continuously while uterine contractions are stimulated by intravenous infusion into the mother of a dilute solution of oxytocin. In a normal pregnancy, fetal PO₂ (partial pressure of oxygen) decreases with each uterine contraction and then rapidly returns to normal. A fetal PO₂ drop below 12 mm Hg, resulting in slowing of the FHR, indicates uteroplacental insufficiency. This slowing of the FHR in response to uterine contractions is called a late deceleration.

A Fetus Is Undergoing a Contraction Stress Test