Cord presentation is when the

Correct Answer: A

Rationale: The correct answer is A because cord presentation occurs when the umbilical cord lies in front of the presenting part after the membranes have ruptured. This can lead to compression of the cord during labor, affecting fetal oxygenation. Option B is incorrect as it describes cord prolapse, where the cord lies in front of the presenting part before membrane rupture. Option C describes nuchal cord, where the cord is wrapped around the fetal neck. Option D describes cord abruption, where the cord detaches prematurely from the placenta.

Correct Answer: D

Rationale: In True cephalopelvic disproportion, the baby's head is too large to pass through the mother's pelvis. This condition often requires operative delivery (C-section) as a vaginal birth is not possible. Choice D is correct because operative delivery is indeed needed to safely deliver the baby. Choice A is incorrect as not all patients with cephalopelvic disproportion will necessarily require operative delivery. Choice B is also incorrect as the issue cannot generally be overcome during labor due to physical constraints. Choice C is incorrect as operative delivery is usually necessary in cases of true cephalopelvic disproportion to prevent complications.

Correct Answer: A

Rationale: The correct answer is A: Submentovertival, bitemporal. In a face presentation, the presenting diameters are submentovertival (chin to vertex) and bitemporal (temple to temple). This is because the fetus is in a face-first position with the chin presenting first. Option B is incorrect because submentobregmatic is not a recognized presenting diameter in face presentation. Option C is incorrect as biparietal refers to the widest transverse diameter of the fetal head, not relevant in face presentation. Option D is incorrect as mentovertical is not a valid presenting diameter in face presentation.

Correct Answer: A

Rationale: The correct answer is A because an estimated fetal weight below 3500 grams indicates a lower risk of complications during childbirth. Higher fetal weight increases the likelihood of shoulder dystocia and birth injuries. Maternal body mass index, gestational age, and maternal age do not directly impact the likelihood of a favorable outcome during a trial of scar.

Correct Answer: B

Rationale: The correct answer is B: Face presentation. Vaginal delivery is possible in face presentation as the baby's head is extended, allowing for descent through the birth canal. Brow presentation (A) and shoulder presentation (C) may require cesarean delivery due to the atypical presentation of the baby. Unstable lie (D) refers to the baby being in a transverse position, which also necessitates a cesarean section. Face presentation is the only option where vaginal delivery may be possible due to the extended position of the baby's head.