Obstetrics and Gynecology

A 25-year-old primigravid woman at 29 weeks gestation is evaluated in the obstetric clinic for a three-day history of right-sided flank discomfort. She describes the sensation as a mild, constant ache. She reports increased urinary frequency over the past month but specifically denies dysuria, hematuria, fever, chills, or nausea. Her temperature is 37.0°C (98.6°F), blood pressure is 114/72 mmHg, heart rate is 84/min, and respiratory rate is 16/min. Physical examination shows a gravid, non-tender abdomen with a fundal height of 29 cm. There is no costovertebral angle tenderness. A clean-catch urinalysis is negative for leukocyte esterase, nitrites, and blood. Due to the patient's persistent concern, a renal ultrasound is performed, revealing moderate dilation of the right renal pelvis and proximal ureter that tapers smoothly at the pelvic brim. The left kidney and ureter appear normal. No echogenic shadowing structures are seen. Which of the following is the most appropriate next step in management?

A 29-year-old G2P1 at 39 weeks gestation presents to the labor and delivery triage in the second stage of labor with an overwhelming urge to push. Her pregnancy has been uncomplicated, though she missed her final prenatal visits. Bedside ultrasound confirms a frank breech presentation. Pelvic examination reveals complete cervical dilation, complete effacement, and the fetal buttocks distending the perineum at +3 station. Continuous fetal heart rate monitoring demonstrates a reassuring Category I tracing. Given the imminent delivery, the obstetrician prepares for an assisted vaginal breech delivery.

Arrange the following obstetric maneuvers and actions in the correct chronological sequence for an assisted vaginal breech delivery.

An uncomplicated full-term pregnancy brings a 29-year-old expectant mother to the obstetric triage unit experiencing painful, regular uterine contractions. Arrange the following stages and phases of a normal obstetric labor in the correct chronological order, starting from the onset of true labor and concluding with the immediate postpartum recovery period.

A healthy $25$-year-old woman, who is pregnant for the first time, visits her obstetrician for a scheduled mid-pregnancy evaluation at $26$ weeks of gestation. Her pregnancy has progressed normally without any complications, and her blood group is O positive. She states that she is feeling the baby move frequently. Her only new symptom is mild swelling in both ankles that appears in the late afternoon and resolves after resting overnight.

On physical assessment, her temperature is $37.0^\circ\text{C}$ ($98.6^\circ\text{F}$), blood pressure is $112/68 \text{ mm Hg}$, pulse is $85/\text{min}$, and respiratory rate is $14/\text{min}$. Cardiovascular auscultation reveals a soft, grade 1/6 systolic ejection murmur at the left upper sternal border. The abdomen is non-tender, and the distance from the pubic symphysis to the top of the uterus measures $26 \text{ cm}$. Trace pitting edema is noted symmetrically on the lower legs.

A panel of screening tests is performed with the following results:

Hemoglobin: $10.9 \text{ g/dL}$
Mean corpuscular volume: $89 \text{ fL}$
Leukocyte count: $11,800/\text{mm}^3$
Platelet count: $195,000/\text{mm}^3$
1-hour 50-g oral glucose challenge test: $132 \text{ mg/dL}$

Based on these findings, which of the following is the most appropriate action?

Presenting to the emergency department is a 19-year-old nulliparous female who complains of worsening bilateral pelvic pain and an inability to keep food or liquids down since yesterday. She reports feeling feverish and having a yellowish vaginal discharge for the past three days. Her medical history is unremarkable, and she uses oral contraceptive pills inconsistently. She has had two new male sexual partners in the last month. Vital signs show a temperature of 38.9°C (102.0°F), pulse of 112/min, and blood pressure of 116/74 mmHg. Abdominal examination reveals guarding and rebound tenderness in the bilateral lower quadrants. Pelvic examination is notable for a friable cervix with mucopurulent exudate, and significant pain is elicited upon manipulation of the cervix. Bimanual examination demonstrates prominent bilateral adnexal tenderness without palpable masses. A transvaginal ultrasound reveals hyperemic, thickened fallopian tubes with trace pelvic free fluid. The ovaries are normal in size, no complex adnexal collections are present, and a normal appendix is visualized. Urine $\beta$-hCG is negative. Which of the following is the most appropriate initial management for this patient?

During routine prenatal evaluations of healthy, uncomplicated pregnancies, various clinical and laboratory findings frequently mimic pathological states. Match each isolated, normal physiologic finding to the primary underlying mechanism responsible for its presentation.

An obstetrician is reviewing the standard prenatal care schedule with a patient who has just established care at 8 weeks gestation. The patient, who is pregnant with her first child, has an unremarkable medical history and is currently asymptomatic. To properly educate the patient on what to expect throughout her uncomplicated singleton pregnancy, the physician outlines the timeline for standard maternal and fetal assessments. Arrange the following routine prenatal interventions in the correct chronological sequence from the earliest gestational age to the latest.

A 31-year-old female patient is evaluated in the outpatient setting for secondary amenorrhea. Her last menstrual period was eight months ago. Prior to this, her menses were regular, lasting 5 days and occurring every 29 days. She has no chronic medical conditions and takes no medications. Vital signs include a blood pressure of $112/72 \text{ mmHg}$, a heart rate of $74/\text{min}$, and a respiratory rate of $14/\text{min}$. Physical examination reveals a normal thyroid gland, no galactorrhea, and normal external genitalia with a well-estrogenized vaginal mucosa. Arrange the following diagnostic steps in the correct chronological sequence for evaluating this patient's condition, starting with the most immediate initial test and progressing to tests for anatomical abnormalities.

An obstetrician is called to evaluate a nulliparous patient in active labor at 39 weeks gestation. The patient, who has had an uncomplicated prenatal course, was admitted at 6 cm cervical dilation. Shortly after receiving continuous epidural analgesia for pain management, she reports feeling profoundly lightheaded, nauseous, and visually blurred. A focused assessment reveals a maternal blood pressure of 82/48 mm Hg and a heart rate of 112/min. Concurrently, the continuous fetal monitor demonstrates a sudden drop in the fetal heart rate from a baseline of 145/min to 85/min, which has now persisted for 3 minutes without recovery. The nursing staff has already turned the patient onto her left side and administered a rapid 500 mL intravenous bolus of lactated Ringer's solution. Upon reassessment 3 minutes later, the maternal blood pressure is 84/50 mm Hg and the fetal heart rate remains at 85/min.

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

A 31-year-old G1P0 woman at 34 weeks gestation is admitted to the labor and delivery unit for management of preeclampsia with severe features. Upon admission, her blood pressure is 175/115 mmHg, and laboratory evaluation reveals a platelet count of 90,000/mm $^3$, aspartate aminotransferase of 110 U/L, and alanine aminotransferase of 125 U/L. A continuous intravenous infusion of magnesium sulfate is initiated for seizure prophylaxis, along with intravenous hydralazine.

Over the subsequent 12 hours, the patient receives 3 liters of intravenous lactated Ringer solution because her urine output has been consistently 15 mL/hour. She now complains of new-onset, severe shortness of breath, a persistent cough, and the inability to lie flat.

Current vital signs are:
Temperature: 37.0°C (98.6°F)
Blood pressure: 160/100 mmHg
Pulse: 115/min
Respiratory rate: 28/min
Oxygen saturation: 86% on room air

Physical examination reveals 3+ pitting edema of the lower extremities extending to the knees and bilateral basilar crackles on lung auscultation. Deep tendon reflexes are 2+ and symmetric globally.

Arterial blood gas analysis on room air shows:
pH: 7.46
PaO $_2$: 55 mmHg
PaCO $_2$: 28 mmHg
HCO $_3^-$: 19 mEq/L

The fetal heart rate tracing demonstrates a baseline of 145/min, minimal variability, and recurrent late decelerations.

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

A 31-year-old female patient presents to the outpatient gynecology office reporting the absence of menstruation for the past 9 months. She experienced menarche at age 12, and her menses were consistently regular until this past year. Her medical history is notable for an incomplete spontaneous abortion 11 months ago, which was managed with a dilation and curettage. She currently denies nipple discharge, headaches, visual field deficits, or vasomotor symptoms. Her blood pressure is 112/72 mm Hg, pulse is 76/min, and body mass index is 22 kg/m^2. Physical examination demonstrates Tanner stage 5 breast development and normal-appearing female external genitalia. Arrange the following diagnostic steps in the classical sequential order to properly evaluate the etiology of this patient's secondary amenorrhea.

Match each patient's clinical presentation and examination findings to the most likely etiologic pathogen responsible for their symptoms.

A nulliparous woman presents to the labor ward at 40 weeks of gestation complaining of regular, painful contractions. Upon admission, her vital signs are within normal limits. Her cervix is dilated to 5 cm and is 90% effaced. Artificial rupture of membranes is performed, yielding a moderate amount of clear amniotic fluid. Two hours later, her cervix is 7 cm dilated. The continuous fetal heart rate tracing demonstrates a baseline of 140/min and moderate variability. However, the tracing also reveals recurrent, abrupt drops in the heart rate to 90/min that last for 40 seconds before rapidly returning to the baseline. These drops are not consistently related to the peak of the uterine contractions, which are occurring every 3 minutes. The patient is immediately placed in the left lateral decubitus position and given an intravenous fluid bolus, but the fetal heart rate pattern remains unchanged. Which of the following is the most appropriate next step in management?

An obstetric team is managing a multiparous patient at 36 weeks gestation who is admitted to the labor unit for induction of labor due to poorly controlled gestational diabetes. Her prenatal care was delayed, and she had only a single second-trimester ultrasound which was reportedly normal. Following artificial rupture of membranes at 5 centimeters of cervical dilation to place an internal fetal scalp electrode, the patient immediately develops moderate, bright red vaginal bleeding. Her blood pressure is 118/76 mm Hg, and pulse is 84/min. The electronic fetal monitor subsequently demonstrates a visually smooth, undulating baseline heart rate that fluctuates evenly between 130 and 150/min. This pattern repeats 4 times per minute and exhibits an absolute lack of short-term beat-to-beat variability. The fetal heart rate does not change in response to vibroacoustic stimulation. Uterine contractions remain regular every 4 minutes. Which of the following is the most appropriate next step in the management of this patient?

A 34-year-old G3P3 woman with a history of poorly controlled asthma and gestational hypertension experiences a massive postpartum hemorrhage immediately following a spontaneous vaginal delivery of a 4200-g neonate. The placenta delivered intact. The uterus is soft, boggy, and palpated 3 cm above the umbilicus. Arrange the following therapeutic interventions in the most appropriate sequential order to manage this patient's hemorrhage, assuming each consecutive measure fails to achieve hemostasis.

Match each clinical scenario describing an acute intrapartum or puerperal emergency with its most appropriate immediate definitive management step.

Evaluate the following complex laboratory and clinical profiles of pregnant patients presenting with hepatic or hematologic dysfunction. Pair each patient presentation with its most precise underlying pathophysiologic mechanism.

An otherwise healthy 29-year-old woman is evaluated in the outpatient clinic for a 7-month history of absent menses. Menarche occurred at age 12, and her menstrual cycles were previously regular, occurring every 28 to 30 days. She runs 15 miles per week and consumes a balanced diet. Her body mass index is 22 kg/m². She takes no daily medications and has no history of chronic medical conditions. A urine human chorionic gonadotropin test is negative. Physical examination reveals normal breast development without galactorrhea. There is no evidence of hirsutism, acne, or clitoromegaly. Pelvic examination is unremarkable. Which of the following is the most appropriate next step in the evaluation of this patient?

A $28$-year-old woman, gravida $2$, para $1$, presents to the clinic for her initial prenatal evaluation at $9$ weeks gestation based on her last menstrual period. Her only complaints are mild fatigue and intermittent morning nausea, which improve with small meals. She has no significant past medical history and takes a daily prenatal vitamin. Her vital signs are within normal limits. Physical examination reveals a normal-appearing thyroid gland with no palpable enlargement or nodules. Pelvic examination is consistent with her gestational age. Because of her fatigue, a primary care physician previously ordered laboratory tests prior to this obstetric visit. The results are as follows:

Thyroid-stimulating hormone (TSH): $0.1$ $\mu$ U/mL (Reference: $0.5$–$5.0$ $\mu$ U/mL)
Total thyroxine (Total T4): $14.2$ $\mu$ g/dL (Reference: $5.0$–$12.0$ $\mu$ g/dL)
Free thyroxine (Free T4): $1.4$ ng/dL (Reference: $0.8$–$2.0$ ng/dL)

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

A $28$-year-old primigravida at $10$ weeks gestation comes to the clinic for her initial prenatal visit. She reports mild nausea, breast tenderness, occasional palpitations, and feeling warmer than usual over the past few weeks. She has no significant past medical history and takes a daily prenatal vitamin. Vital signs include a heart rate of $92$/min and a blood pressure of $110/70$ mmHg. Physical examination reveals a normal-sized, non-tender thyroid gland without palpable nodules. Deep tendon reflexes are normal.

Laboratory evaluation shows the following:

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