Obstetrics and Gynecology

Match each characteristic clinical presentation of a third-trimester or intrapartum obstetric emergency with its most likely underlying etiology.

A healthy 24-year-old woman, currently at 30 weeks gestation in her first pregnancy, presents for a standard obstetric check-up. She reports normal fetal movement and denies any headaches, visual changes, right upper quadrant abdominal pain, or dysuria. Her blood pressure is $114/72 \text{ mm Hg}$, and her pulse is $82 \text{/min}$. A routine basic metabolic panel is obtained and reveals a blood urea nitrogen (BUN) level of $7 \text{ mg/dL}$ and a serum creatinine of $0.4 \text{ mg/dL}$. Urinalysis shows no proteinuria or hematuria. Which of the following is the most appropriate next step in management?

A 72-year-old female presents to the gynecology clinic reporting a six-month history of severe vulvar pruritus and a painful, non-healing sore. Her past medical history is significant for hypertension and lichen sclerosus. Physical examination reveals a 3.5-cm ulcerated, indurated plaque located on the right labium majus. Palpation of the right inguinal region identifies a firm, mobile, 1.5-cm lymph node. The left groin is unremarkable. Arrange the following steps in the most appropriate chronological sequence for the diagnosis and management of this patient's condition.

During routine prenatal care, various screening tests and clinical evaluations are utilized to monitor maternal and fetal well-being. Match each specific clinical presentation or screening result with its most appropriate next step in management or physiological interpretation.

A $31$-year-old pregnant patient (G2P1) presents to the obstetric triage unit at $31$ weeks gestation after experiencing a sudden gush of clear vaginal fluid. The fluid loss occurred approximately $2$ hours ago, and she reports continuous vaginal leaking since that time. The patient notes normal fetal movement and denies painful uterine contractions or vaginal bleeding. Her previous pregnancy resulted in an uncomplicated term vaginal delivery. She takes a daily prenatal vitamin and has no known drug allergies.

Her temperature is $37.1^{\circ}$ C ($98.8^{\circ}$ F), blood pressure is $112/72$ mm Hg, pulse is $84$/min, and respiratory rate is $16$/min. Speculum examination reveals a visually closed cervical os with a pool of clear fluid in the posterior vaginal fornix. The fluid turns nitrazine paper blue and demonstrates an arborization pattern on microscopic evaluation.

Continuous external fetal monitoring shows a baseline heart rate of $145$/min with moderate variability, presence of spontaneous accelerations, and no decelerations. Tocodynamometry confirms the absence of uterine contractions. Laboratory evaluation reveals:

Hemoglobin: $10.8$ g/dL
Leukocyte count: $14,200$/mm $^3$
Platelet count: $185,000$/mm $^3$

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

An obstetric patient comes to the clinic for her 16-week follow-up appointment. The 25-year-old primigravida reports mild dizziness upon standing but denies syncope, visual changes, or vaginal bleeding. Her baseline blood pressure prior to conception was 118/76 mm Hg. Today, her vitals include a heart rate of 88/min and a blood pressure of 100/58 mm Hg. Physical examination reveals a grade 1/6 systolic ejection murmur and clear lungs. What is the underlying physiological mechanism responsible for the alteration in her hemodynamics?

Match each clinical presentation of a third-trimester obstetric complication with its most likely diagnosis.

A 30-year-old woman, gravida 3, para 2, at 41 weeks gestation is in the second stage of labor. The fetal head is delivered but immediately retracts tightly against the maternal perineum (turtle sign). The anterior shoulder does not deliver with gentle downward traction. Arrange the following management steps in the most appropriate standard sequential order.

Match each routine prenatal clinical encounter or patient presentation with the most appropriate indicated screening test or clinical action.

A healthy 26-year-old primigravida presents for her initial prenatal visit at 6 weeks gestation. As her pregnancy progresses, she will experience numerous expected physiologic adaptations to support fetal growth and development. Arrange the following normal maternal physiologic milestones in chronological order from earliest to latest occurrence during gestation.

Match the following clinical presentations of acute obstetric emergencies with their most appropriate definitive diagnoses.

A 29-year-old woman, gravida 1 para 0, at 36 weeks gestation is admitted to the triage area for the evaluation of severe preeclampsia. During the initial assessment, she suddenly loses consciousness and exhibits generalized tonic-clonic movements. Arrange the following interventions in the most appropriate chronological order for managing this acute obstetric emergency.

A primigravid patient is evaluated at 22 weeks gestation during a scheduled check-up. She mentions occasionally feeling a 'need to breathe deeper' but denies any cough, wheezing, or chest pain. Her physical examination is unremarkable. Physiologic evaluation reveals a normal respiratory rate, increased tidal volume, and a decreased arterial partial pressure of carbon dioxide ($PaCO_2$) compared to expected pre-pregnancy baseline values. Which of the following best explains these normal respiratory changes in this patient?

A healthy 24-year-old primigravida presents for her initial prenatal visit at 8 weeks gestation. She asks about the timeline of standard prenatal assessments and screenings she will undergo throughout her pregnancy. Arrange the following routine prenatal evaluations in the correct chronological order as they are typically recommended from the first trimester to term.

A primigravid patient at $39$ weeks gestation arrives at the labor and delivery unit in active labor. Her prenatal course was uncomplicated. Uterine contractions are occurring every $3$ minutes. Initial examination reveals a blood pressure of $120/75 \text{ mm Hg}$, a heart rate of $98/\text{min}$, and a respiratory rate of $20/\text{min}$. Routine admission laboratory results show a hemoglobin level of $10.8 \text{ g/dL}$ and a hematocrit of $32\%$. Because the patient reports feeling mildly short of breath during contractions, an arterial blood gas analysis is obtained, which reveals a pH of $7.44$, $\text{PaCO}_2$ of $28 \text{ mm Hg}$, and $\text{PaO}_2$ of $104 \text{ mm Hg}$. The patient subsequently requests neuraxial analgesia, and an epidural block is administered without technical difficulty. Twenty minutes later, she reports feeling dizzy and nauseated. Her blood pressure is now $86/50 \text{ mm Hg}$. Concurrent electronic fetal monitoring demonstrates a baseline heart rate of $140/\text{min}$, minimal variability, and symmetric, gradual decreases in the heart rate that reach their nadir after the peak of each uterine contraction. Which of the following is the most appropriate initial step in management?

An obstetric evaluation is requested for a 32-year-old woman, currently at $34$ weeks gestation, who visits the clinic with concerns of progressive breathlessness over the past three weeks. She notes that the shortness of breath is most pronounced when climbing the stairs to her apartment. Additionally, she reports an occasional "fluttering" sensation in her chest and mild ankle swelling that worsens by the evening. This is her first pregnancy, which has been uncomplicated thus far; her $1$-hour oral glucose tolerance test at $26$ weeks was within normal limits.

Vital signs show a temperature of $37.0^\circ\text{C}$ ($98.6^\circ\text{F}$), heart rate of $98/\text{min}$, respiratory rate of $18/\text{min}$, and blood pressure of $105/65 \text{ mm Hg}$.

Cardiac auscultation reveals a prominent point of maximal impulse shifted to the fourth intercostal space at the midclavicular line. A grade $2/6$ early systolic ejection murmur is best heard at the left upper sternal border, and a distinct $S_3$ gallop is audible. Pulmonary auscultation is clear in all fields. Lower extremities exhibit $1+$ bilateral pitting edema up to the ankles.

An electrocardiogram demonstrates normal sinus rhythm with left axis deviation and inverted T waves in lead III. Due to her respiratory complaints, an arterial blood gas analysis on room air is obtained by the triage nurse.

Laboratory studies reveal the following:
* Hemoglobin: $11.2 \text{ g/dL}$
* Platelets: $130,000/\text{mm}^3$
* Serum creatinine: $0.5 \text{ mg/dL}$
* Arterial blood gas (room air): $pH$ $7.44$, $PaO_2$ $102 \text{ mm Hg}$, $PaCO_2$ $28 \text{ mm Hg}$, $HCO_3^-$ $18 \text{ mEq/L}$
* Urinalysis: trace protein, $1+$ glucose, negative for leukocyte esterase and nitrites

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

A 27-year-old G1P0 at 28 weeks gestation arrives at the obstetric clinic for a scheduled prenatal visit. She works as a teacher and mentions mild fatigue by the late afternoon, but otherwise feels healthy. She is fully compliant with her daily prenatal vitamin. Vital signs demonstrate a blood pressure of 112/68 mm Hg and a heart rate of 84/min. Physical examination confirms a fundal height of 28 cm, and the fetal heart rate is reassuring at 150/min. A routine complete blood count is obtained and shows the following results:

Hemoglobin: 10.8 g/dL
Hematocrit: 33%
Mean corpuscular volume (MCV): 88 fL
Platelet count: 215,000/mm³

Which of the following physiologic mechanisms best explains this patient's hematologic profile?

A 24-year-old primigravida at 38 weeks and 4 days gestation is admitted to the labor and delivery unit in active labor. Her cervical dilation is 6 cm. She requests and receives epidural analgesia for pain relief. Fifteen minutes later, the patient reports feeling lightheaded. Her blood pressure is 85/45 mm Hg and heart rate is 110/min. Physical examination reveals mild bilateral lower extremity edema. Continuous fetal heart rate monitoring demonstrates a baseline of 145/min, minimal variability, and recurrent gradual decreases in the fetal heart rate that begin after the peak of each uterine contraction and return to baseline after the contraction ends. Which of the following is the most appropriate next step in management?

A $27$-year-old woman, gravida $2$, para $1$, at $31$ weeks gestation is evaluated in the labor and delivery unit for chills and a rapid heart rate. She was admitted $48$ hours ago after presenting with a sudden gush of clear vaginal fluid. Ferning and nitrazine tests were positive at that time. Upon admission, she received her first dose of intramuscular betamethasone and was started on prophylactic intravenous ampicillin and oral azithromycin. Her temperature is $39.1^\circ\text{C}$ ($102.4^\circ\text{F}$), blood pressure is $112/72$ mmHg, pulse is $118$/min, and respirations are $18$/min. Continuous fetal monitoring shows a baseline heart rate of $175$/min with moderate variability and no decelerations. Physical examination reveals a tender uterine fundus and malodorous fluid pooling in the posterior vaginal fornix. The cervix is $2$ cm dilated and $50\%$ effaced, with the fetal vertex at $-2$ station. Which of the following is the most appropriate next step in management?

A 28-year-old woman, gravida 2, para 1, at 34 weeks gestation presents to the clinic for a routine scheduled visit. She reports that her shoes have felt increasingly tight over the past two weeks and she has noticed swelling in both of her ankles. The swelling progressively worsens throughout the day but improves significantly after she sleeps at night. She denies any headaches, visual changes, right upper quadrant pain, chest pain, or shortness of breath. Vital signs include a blood pressure of 116/74 mm Hg, a heart rate of 82/min, and a respiratory rate of 14/min. Physical examination reveals 1+ pitting edema of the bilateral lower extremities extending up to the ankles. Deep tendon reflexes are 2+ and symmetric. Urinalysis is negative for protein and glucose. Which of the following is the most appropriate next step in management for this patient's symptoms?