Fetal Heart Rate Changing unrelated to Uterine Contraction! - USMLE Forums
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Old 11-22-2012
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ObGyn Fetal Heart Rate Changing unrelated to Uterine Contraction!

A 23 yo woman comes to the hospital at 38 weeks gestation with regular contractions of 3 in 10 minutes. She is 5cm dilated and 60 percent effaced. Labor progresses and membranes are ruptured. The tocometer reading shows a decrease in FHR and return to baseline with no relationship to uterine contractions What is the cause of the change in Fetal heart rate?

(a) Early decelerations
(B) Head compressions
(C) Fetal hypoxia
(d) Fetal acidosis
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Old 11-22-2012
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A=B Early deceleration's due to head compression so those are out.

Deceleration's with NO relation to Uterine contractions means "Variable" which is caused by Umbilical Chord compression. Which can cause Hypoxia and eventual acidosis.

Since BOTH options are give, I think I would mark C. Fetal Hypoxia since that happens first.

Not to sure though. What is the answer ?
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Old 11-22-2012
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(C) fetal hypoxia

Acidosis will happen with UP insufficiency or severe cord compression.
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Old 11-22-2012
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hypoxia will eventually progress to acidosis.
so i think its fetal hypoxia.
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Old 11-22-2012
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Good job guys. Correct answer C
If you want to read more about it, check out uw q#3869
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Old 11-22-2012
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Oh thanks for the reference point!
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