Oxygen delivery to fetus Flashcards
1
Q
Which of the following physiologic changes that improve oxygen delivery to the fetus during normal pregnancy is least likely?
(a) Increased Hct, (b) Maternal hyperventilation
A
(a)
2
Q
Which of the following FETAL adaptation protects the fetus during periods of acute maternal hypoxia?
(a) Increased Hb concentration (b) Increased oxygen unloading from hemoglobin, (c) increased 2,3, DPG (d) High oxygen tension
A
(a) HbF has a high affinity to oxygen and much less 2,3,DPG in the fetal circulation. fetal oxygen hemoglobin dissociation curve is left shifted promoting oxygen uptake. Fetal hemoglobin conc. provides arterial oxygen content despite of lower oxygen tension.
