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Multifetal Pregnancy

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Compared with singleton pregnancies, multifetal gestations have a higher risk of all EXCEPT which of the following complications?

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a. Preeclampsia

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b. Hysterectomy

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c. Maternal death

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d. Postterm pregnancy

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Compared with singleton pregnancies, multifetal gestations have an infant mortality rate that is how many times greater?

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a. Twofold

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b. Threefold

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c. Fivefold

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d. Tenfold

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Which of the following mechanisms may prevent monozygotic twins from being truly “identical”?

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a. Postzygotic mutation

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b. Unequal division of the protoplasmic material

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c. Variable expression of the same genetic disease

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d. All of the above

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A patient delivers a twin gestation in which one infant has blood type A and one has type O. The patient and her husband are both type O. A particular phenomenon is proposed as the etiology of the discordant blood types. How would you explain this to the mother?

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a. The proposed phenomenon does not spontaneously occur in humans.

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b. It involves fertilization of one ovum that splits into two during the same menstrual cycle.

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c. It involves fertilization of two ova within the same menstrual cycle, but not at the same coitus.

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d. It involves fertilization of two ova separated in time by an interval as long as or longer than a menstrual cycle.

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When trying to establish chorionicity of the pregnancy shown in the image here, which of the following statements is true?

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Reproduced with permission from Cunningham FG, Leveno KJ, Bloom SL, et al (eds): Multifetal pregnancy. In Williams Obstetrics, 24th ed. New York, McGraw-Hill, 2014, Figure 45-7B.

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a. There are two placentas.

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b. The twins must be monozygotic.

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c. The twins share the same ...

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