Delivery of breech with an extended head is accomplished through

Correct Answer: C

Rationale: The correct answer is C: Mauriceau-Smellie-Veit maneuver for delivery of breech with an extended head. This maneuver involves flexing the head while still in the vagina to allow for easier delivery. The Burns Marshall maneuver (A) is for impacted fetal shoulders, Lovset maneuver (B) is for shoulder dystocia, and McRobert's maneuver (D) is for shoulder dystocia as well. The Mauriceau-Smellie-Veit maneuver is specifically designed for delivering a breech with an extended head, making it the correct choice in this scenario.

Correct Answer: A

Rationale: The engaging diameter in a face presentation is the sub-mento vertical diameter. This is the correct answer because it represents the distance from the tip of the chin (mentum) to the highest point on the skull (vertex), which is the most critical diameter for the face to descend through the pelvis during childbirth. Choice B (Sub-mento bregmatic diameter) is incorrect because it represents the distance from the tip of the chin to the anterior fontanelle, not the highest point on the skull. Choice C (Mento vertical diameter) is incorrect because it refers to the distance from the chin to the base of the skull, not the highest point on the skull. Choice D (Sub-occipito bregmatic diameter) is incorrect because it represents the distance from the base of the skull to the anterior fontanelle, not involving the chin.

Correct Answer: C

Rationale: The correct answer is C: Occipito-posterior. This position occurs when the baby's head is facing forward but towards the mother's spine. This position can cause intense back pain during labor because the baby's head puts pressure on the mother's lower back. Occipito-anterior (A) is the most common and ideal position for labor. Transverse position (B) is when the baby is lying sideways, which may cause prolonged labor but not necessarily intense back pain. Occipito-lateral (D) is a less common position where the baby's head is facing sideways, which may not specifically cause intense back pain.

Correct Answer: C

Rationale: Rationale: Face to pubis delivery occurs when the fetal face presents towards the mother's pubic bone during birth. Choice C is correct because a 45˚ anterior rotation of the occiput is needed for this positioning. This allows the fetal face to be directed towards the mother's pubis for a successful face to pubis delivery. Choices A and D are incorrect as they mention incorrect angles of rotation. Choice B is incorrect as a persistent occipito posterior position would result in a face to sacrum delivery, not face to pubis.

Correct Answer: D

Rationale: The correct answer is D because in deep transverse arrest, the sagittal suture of the fetal head is typically aligned with the oblique diameter of the pelvis, causing an obstruction in the descent of the baby. This alignment leads to a difficult labor scenario where the baby's head cannot pass through the pelvis due to the mismatch in diameters. Choices A, B, and C are incorrect because they do not accurately describe the specific anatomical alignment that characterizes deep transverse arrest. Choice A refers to occipito-frontal diameter, choice B refers to sub-occipito-bregmatic diameter, and choice C mentions a face to pubis delivery, which are not the defining features of deep transverse arrest.