Obstetrics and Gynecology

Match each classic clinical presentation of an obstetric complication with its most likely underlying etiology.

A 28-year-old nulligravid woman comes to the office due to an inability to conceive over the past 14 months despite regular, unprotected intercourse. Her menstrual periods were previously regular every 28 days but became increasingly spaced apart starting 8 months ago. She has had no menses for the last 4 months. The patient also reports a recent onset of constipation, generalized fatigue, and a 4.5-kg (10-lb) weight gain. She takes no medications. Vital signs are temperature 36.4°C (97.5°F), blood pressure 110/70 mm Hg, and pulse 58/min. BMI is $27\ kg/m^2$. Physical examination reveals a moderately enlarged, non-tender thyroid gland and bilateral milky nipple discharge expressible on palpation. Neurologic examination shows delayed relaxation of the deep tendon reflexes. A urine pregnancy test is negative.

Laboratory studies show:
- Prolactin: 58 ng/mL (normal: <25 ng/mL)
- Thyroid-stimulating hormone (TSH): 18.2 µU/mL (normal: 0.4-4.0 µU/mL)
- Free thyroxine (T4): 0.5 ng/dL (normal: 0.8-1.8 ng/dL)

Which of the following is the most appropriate next step in management for this patient?

A 24-year-old G1P0 woman at 39 weeks of gestation is evaluated in the labor suite. She was admitted 4 hours ago in spontaneous active labor and is currently not receiving any medications. Her temperature is 37.1°C (98.8°F), blood pressure is 118/72 mm Hg, pulse is 88/min, and respirations are 16/min. Physical examination reveals mild bilateral lower extremity pitting edema and a grade 2/6 systolic ejection murmur at the left sternal border. The cervix is 6 cm dilated and 90% effaced, with the fetal vertex at 0 station. Fetal heart rate monitoring demonstrates a baseline of 140/min with moderate variability. Over the last 30 minutes, there are recurrent, symmetric decreases in the fetal heart rate that begin gradually with the onset of each uterine contraction, reach their nadir of 120/min exactly at the peak of the contraction, and return to the baseline as the contraction ends. Which of the following is the most appropriate next step in management?

A 35-year-old nulligravid woman with a history of severe endometriosis is undergoing her first in vitro fertilization (IVF) cycle using a standard gonadotropin-releasing hormone (GnRH) antagonist protocol. Arrange the following pharmacological interventions and clinical steps of the IVF cycle in the correct chronological sequence, starting from the beginning of ovarian stimulation to the post-retrieval phase.

Match each underlying etiology of male factor infertility with its characteristic clinical and serum laboratory profile.

Identify the most likely underlying etiology for each of the following distinct clinical presentations of postpartum hemorrhage.

A 31-year-old woman comes to the physician because she has not had a menstrual period since giving birth 13 months ago. Her pregnancy was complicated by placental abruption and severe postpartum hemorrhage requiring the transfusion of 4 units of packed red blood cells. She reports that after delivery, her "milk never came in" despite frequent attempts to breastfeed. Over the past 6 months, she has experienced progressive fatigue, cold intolerance, and occasional dizzy spells when standing up. Physical examination shows a blood pressure of 90/60 mm Hg. There is thinning of the lateral eyebrows and an absence of axillary and pubic hair. Pelvic examination shows vaginal mucosal atrophy. Which of the following is the most likely underlying mechanism for this patient's current symptoms?

A 29-year-old G0P0 woman with a body mass index of $33 \text{ kg/m}^2$ is evaluated for difficulty conceiving over the past 18 months. She reports menses occurring every 45 to 60 days. Physical examination reveals terminal hair growth on her chin and upper lip. Pelvic ultrasound displays bilaterally enlarged ovaries with multiple small peripheral follicles. Her partner's semen analysis and her hysterosalpingogram are both within normal limits.

Arrange the following management steps for this patient's infertility in the correct evidence-based sequential order, starting from the most appropriate initial step to the most advanced intervention.

A primigravida at 41 weeks of gestation is in the second stage of labor. Following the delivery of the fetal head, it immediately retracts tightly against the maternal perineum. The attending physician attempts gentle downward traction, but the anterior shoulder fails to pass beneath the pubic symphysis. Arrange the following interventions in the correct chronological sequence of escalation for managing this obstetric emergency.

Secondary amenorrhea and anovulatory infertility can result from various distinct pathophysiologic processes affecting the hypothalamic-pituitary-ovarian (HPO) axis. Match each patient's clinical presentation with its most characteristic serum endocrine laboratory profile.

A $24$-year-old nulliparous woman at $39$ weeks of gestation is evaluated in the labor unit. She was admitted $20$ hours ago following spontaneous rupture of membranes. She has been having irregular, mild contractions. Her temperature is $39.0^\circ\text{C}$ ($102.2^\circ\text{F}$), blood pressure is $112/72\text{ mm Hg}$, pulse is $118/\text{min}$, and respirations are $18/\text{min}$. Fetal heart rate monitoring demonstrates a baseline of $175/\text{min}$ with moderate variability and no decelerations. The uterine fundus is tender to palpation. Cervical examination reveals $4\text{ cm}$ dilation and $80\%$ effacement. Purulent-appearing fluid is noted in the vaginal vault. When discussing possible interventions, the patient expresses severe anxiety about surgical procedures and states, 'I will absolutely not consent to a cesarean delivery under any circumstances, even if the baby is in distress.' She is fully conscious, competent, and understands the risks associated with her refusal. Which of the following is the most appropriate next step in management?

An obstetric patient at 39 weeks gestation is admitted to the labor suite for induction of labor due to chronic hypertension. A continuous oxytocin infusion is currently being administered to augment uterine contractions. The patient's blood pressure is 138/88 mmHg. The continuous electronic fetal monitor displays a baseline heart rate of 145/min with moderate variability. The tracing demonstrates recurrent, gradual decreases in the fetal heart rate, with each deceleration starting after the peak of a uterine contraction and returning to baseline only after the contraction has completely finished. The contractions are occurring every 2 to 3 minutes. Cervical examination shows 5 cm dilation and 90% effacement. Which of the following is the most appropriate initial step in the management of this patient?

A 28-year-old G3P3 woman experiences sudden cardiovascular collapse and a large gush of vaginal bleeding immediately following the vaginal delivery of a healthy infant at 39 weeks of gestation. Physical examination reveals a beefy red, smooth mass protruding from the introitus. The uterine fundus cannot be palpated on abdominal examination. Her blood pressure is 75/40 mm Hg and pulse is 130/min. Intravenous fluids and blood products are rapidly initiated. Arrange the following steps in the correct escalation sequence for the definitive management of this patient's condition.

A 31-year-old woman, gravida 2, para 1, is evaluated in the labor and delivery ward at 38 weeks of gestation. She reports regular, painful uterine contractions. Her prenatal course was notable for a second-trimester ultrasound showing a succenturiate placental lobe. On admission, her blood pressure is 116/74 mm Hg, and her heart rate is 84/min. The fetal heart rate tracing demonstrates a baseline of 145/min with moderate variability and no decelerations. Cervical examination reveals 5 cm dilation and 80% effacement with a bulging amniotic sac. The attending physician performs an artificial rupture of membranes to augment labor. Immediately following the procedure, the patient experiences a sudden gush of bright red vaginal bleeding. The patient reports no new abdominal pain. Simultaneously, the fetal heart rate drops abruptly to a baseline of 70/min and remains there for 4 minutes. The patient is awake, alert, and expresses concern about the baby's status. Which of the following is the most appropriate next step in management?

Match the following clinical presentations of couples experiencing infertility with their most appropriate first-line targeted fertility treatment or management strategy.

Match each distinctive clinical presentation or intrapartum event to the most appropriate obstetric complication.

A pregnant individual at 33 weeks of gestation presents to the obstetrical triage unit reporting a sudden gush of clear vaginal fluid that occurred two hours ago. She has not experienced any abdominal pain, uterine contractions, or vaginal bleeding. Her previous pregnancy resulted in an uncomplicated vaginal delivery at term. Vital signs show a temperature of 37.2°C (99.0°F), blood pressure of 112/72 mm Hg, pulse of 88/min, and respiratory rate of 16/min. A sterile speculum examination confirms a closed external cervical os with a pool of clear fluid in the posterior vaginal fornix that turns nitrazine paper blue. Laboratory evaluation demonstrates a leukocyte count of 14,500/mm³. Continuous fetal monitoring shows a baseline heart rate of 145/min with moderate variability and no decelerations. Tocodynamometry reveals no uterine activity. Which of the following is the most appropriate next step in the management of this patient?

Correlate the following clinical descriptions of late-pregnancy obstetric emergencies with their corresponding anatomical or pathophysiological etiology.

A 25-year-old nulligravid woman presents to the clinic reporting an inability to conceive for the past 16 months. She and her partner have regular unprotected intercourse. The patient has a history of unpredictable menstrual cycles since menarche at age 12, often going 3 to 4 months between menses. Over the past few years, she has noted progressive development of dark, coarse hair on her upper lip, chin, and chest. She takes a daily multivitamin. Her BMI is $31 \text{ kg/m}^2$. Physical examination is notable for hirsutism, moderate facial acne, and thickened, velvety, hyperpigmented skin on the nape of her neck. Pelvic examination is normal. Transvaginal ultrasonography reveals bilaterally enlarged ovaries, each containing about 20 small peripheral follicles. A urine pregnancy test is negative. Serum thyroid-stimulating hormone and prolactin levels are within normal limits.

To formally confirm the most likely diagnosis, which of the following diagnostic tests is required to exclude a phenotypically similar mimicking condition?

Match the following structural imaging or procedural findings encountered during a female infertility evaluation with their most likely underlying diagnosis.