Gynéco

A 29-year-old Caucasian primigravida patient is 20 weeks pregnant with twins. She found out today on her routine ultrasound for fetal anatomy that she is carrying two boys. In this patient’s case, which of the following statements about twinning is true?

The twins must be monozygotic since they are both males.

If division of these twins occurred after formation of the embryonic disk, the twins will be conjoined.

She has a higher incidence of having monozygotic twins since she is Caucasian.

If the ultrasound showed two separate placentas, the twins must be dizygotic.

Twinning causes no appreciable increase in maternal morbidity and mortality over singleton pregnancies.

A 24-year-old primigravida with twins presents for routine ultrasonography at 20 weeks gestation. Based on the ultrasound findings, the patient is diagnosed with dizygotic twins. Which of the following is true regarding the membranes and placentas of dizygotic twins?

They are dichorionic and monoamniotic only if the fetuses are of the same sex.

They are dichorionic and monoamniotic regardless of the sex of the fetuses.

They are monochorionic and monoamniotic if they are conjoined twins.

They are dichorionic and diamniotic regardless of the sex of the twins.

They are monochorionic and diamniotic if they are of the same sex.

During the routine examination of the umbilical cord and placenta after a spontaneous vaginal delivery, you notice that the baby had only one umbilical artery. Which of the following is true regarding the finding of a single umbilical artery?

It is a very common finding and is insignificant.

It is a rare finding in singleton pregnancies and is therefore not significant.

It is equally common in newborns of diabetic and nondiabetic mothers.

After delivery of a term infant with Apgar scores of 2 at 1 minute and 7 at 5 minutes, you ask that umbilical cord blood be collected for pH. The umbilical arteries carry which of the following?

Oxygenated blood to the placenta

Oxygenated blood from the placenta

Deoxygenated blood to the placenta

Deoxygenated blood from the placenta

Oxygenated blood from the placenta to mother

Gynéco

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