A 26-year-old primigravid woman at 39 weeks' gestation is admitted to the hospital in active labor. Pregnancy was complicated by mild oligohydramnios detected a week ago, which was managed with hydration. Her pulse is 92/min, respirations are 18/min, and blood pressure is 134/76 mm Hg. Pelvic examination shows 100% cervical effacement and 10 cm cervical dilation; the vertex is at 0 station. Cardiotocography is shown. Which of the following is the most appropriate next step in management?

Maternal repositioning and oxygen administration

A 36-year-old woman, gravida 3, para 2, at 37 weeks' gestation comes to the emergency department because of sparse vaginal bleeding for 3 hours. She also noticed the bleeding 3 days ago. She has had no prenatal care. Both of her previous children were delivered by lower segment transverse cesarean section. Her temperature is 37.1°C (98.8°F), pulse is 90/min, respirations are 16/min, and blood pressure is 110/80 mm Hg. The abdomen is nontender, and no contractions are felt. Examination shows that the fetus is in a vertex presentation. The fetal heart rate is 160/min and shows no abnormalities. Which of the following is the most appropriate next step in management?

Perform transvaginal sonography

Conduct contraction stress test

Immediately following prolonged delivery of the placenta at 40 weeks gestation, a 32-year-old multiparous woman develops vaginal bleeding. Other than mild asthma, the patient’s pregnancy has been uncomplicated. She has attended many prenatal appointments and followed the physician's advice about screening for diseases, laboratory testing, diet, and exercise. Previous pregnancies were uncomplicated. She has no history of a serious illness. She is currently on intravenous infusion of oxytocin. Her temperature is 37.2°C (99.0°F), blood pressure is 108/60 mm Hg, pulse is 88/min, and respirations are 17/min. Uterine palpation reveals a soft enlarged fundus that extends above the umbilicus. Based on the assessment of the birth canal and placenta, which of the following options is the most appropriate initial step in patient management?

Manual exploration of the uterus

A 30-year-old woman, gravida 2 para 1, at 39 weeks gestation presents to the hospital with painful contractions and a rupture of membranes. She reports that the contractions started a couple hours ago and are now occurring every 4 minutes. She is accompanied by her husband who states, “her water broke an hour ago before we left for the hospital." The patient denies vaginal bleeding, and fetal movements are normal. The patient has attended all her pre-natal visits without pregnancy complications. She has no chronic medical conditions and takes only pre-natal vitamins. Her blood pressure is 110/75 mm Hg and pulse is 82/min. A fetal heart rate tracing shows a pulse of 140/min with moderate variability and no decelerations. Cervical examination reveals a cervix that is 7 cm dilated and 100% effaced with the fetal head at -1 station. The patient forgoes epidural anesthesia. During which of the following scenarios should a cesarean delivery be considered for this patient?

Cervix is 7 cm dilated and fetal head is at 0 station after 4 hours, with contractions every 2 minutes

Cervix is 7 cm dilated and fetal head is at -1 station after 2 hours with contractions every 7 minutes

Cervix is 9 cm dilated and fetal head is at -1 station after 3 hours, with contractions every 3 minutes

Cervix is 10 cm dilated and fetal head is at +1 station after 2 hours, with contractions every 2 minutes

Cervix is 7 cm dilated and fetal head is at 0 station after 1 hour, with contractions every 5 minutes

A 63-year-old woman with a past medical history significant for hypertension presents to the outpatient clinic for evaluation of vaginal dryness, loss of libido, and hot flashes. These symptoms have been progressively worsening over the past 3 months. Her vital signs are: blood pressure 131/81 mm Hg, pulse 68/min, and respiratory rate 16/min. She is afebrile. On further review of systems, she endorses having irregular periods for almost a year, and asks if she has begun menopause. Which of the following parameters is required to formally diagnosis menopause in this patient?

Cessation of menses for at least 12 months

Increased serum follicle-stimulating hormone (FSH)

Increased serum luteinizing hormone (LH)

Pelvic ultrasound demonstrating decreased follicular activity

A 37-year-old woman, gravida 2, para 1, at 35 weeks' gestation is brought to the emergency department for the evaluation of continuous, dark, vaginal bleeding and abdominal pain for one hour. Her first child was delivered by lower segment transverse cesarean section because of a nonreassuring fetal heart rate. The patient has a history of hypertension and has been noncompliant with her hypertensive regimen. Her medications include methyldopa, folic acid, and a multivitamin. Her pulse is 90/min, respirations are 16/min, and blood pressure is 145/90 mm Hg. The abdomen is tender, and hypertonic contractions can be felt. There is blood on the vulva, the introitus, and on the medial aspect of both thighs. The fetus is in a breech presentation. The fetal heart rate is 180/min with recurrent decelerations. Which of the following is the cause of fetal compromise?

Placental tissue covering the cervical os

Rupture of aberrant fetal vessels

A 57-year-old, multiparous, woman comes to the physician because of urinary leakage for the past 6 months. She involuntarily loses a small amount of urine after experiencing a sudden, painful sensation in the bladder. She has difficulty making it to the bathroom in time, and feels nervous when there is no bathroom nearby. She also started having to urinate at night. She does not have hematuria, abdominal pain, or pelvic pain. She has insulin-dependent diabetes mellitus type 2, and underwent surgical treatment for symptomatic pelvic organ prolapse 3 years ago. Menopause was 6 years ago, and she is not on hormone replacement therapy. She works as an administrative manager, and drinks 3–4 cups of coffee daily at work. On physical examination, there is no suprapubic tenderness. Pelvic examination shows no abnormalities and Q-tip test was negative. Ultrasound of the bladder shows a normal post-void residual urine. Which of the following is the primary underlying etiology for this patient's urinary incontinence?

Increased detrusor muscle activity

Increased urine bladder volumes

Recurrent pelvic organ prolapse

Decreased pelvic floor muscle tone

Operative vaginal delivery for USMLE Step 1: High-Yield OB/GYN Lessons

Indications - When Baby Needs Help

Maternal Indications
- Prolonged Second Stage of Labor
  - Nulliparous: >3 hours (>4 hrs with epidural)
  - Multiparous: >2 hours (>3 hrs with epidural)
- Maternal Exhaustion: Ineffective pushing.
- Need to Avoid Valsalva: E.g., severe cardiac disease, hypertensive crisis, cerebrovascular disease.
Fetal Indications
- Non-reassuring Fetal Status: Suspicion of immediate or potential fetal compromise (e.g., persistent Category II or any Category III FHR tracing).

Fetal head station diagram with pelvic bones and fingers

⭐ Prerequisite Pearl: Operative delivery requires a fully dilated cervix (10 cm), ruptured membranes, an empty bladder, and an engaged fetal head (at least +2 station).

Prerequisites & Contraindications - Green Light, Red Light

⭐ Station +2 is the minimum for outlet procedures. Higher stations (e.g., 0) require low-forceps/vacuum, which have ↑ risks and are rarely performed. This distinction is a frequent exam question.

Instruments & Technique - The Right Tools

Forceps: Metal blades cradle the fetal head along the occipitomental diameter.
- Technique: Requires precise placement; different types for specific needs (e.g., Simpson for molded heads, Kielland for rotation).
- Associated Risks: Higher rates of maternal 3rd/4th-degree perineal tears, vaginal lacerations, and fetal facial nerve palsy.
Vacuum Extractor: Suction cup applied to the fetal scalp over the flexion point.
- Technique: Limits on application time (<20 mins) and number of detachments ("pop-offs," max 3).
- Associated Risks: Higher rates of neonatal cephalohematoma, scalp lacerations, and subgaleal hemorrhage.

Forceps vs. Vacuum: Pros and Cons

⭐ Forceps have a higher success rate for operative delivery but carry a greater risk of significant maternal soft tissue trauma compared to vacuum extraction.

Complications - Handle With Care

Complications of Vacuum-Assisted Operative Vaginal Delivery

Maternal
- Perineal trauma (↑ risk of 3rd/4th degree tears)
- Postpartum hemorrhage (PPH)
- Soft tissue hematomas (vulvar, vaginal)
- Urinary retention & incontinence
- Anal incontinence
Fetal
- Scalp/Facial: Lacerations, bruising
- Hemorrhage: Cephalohematoma (subperiosteal, does not cross sutures), subgaleal hemorrhage (⚠️ most severe)
- Nerve Palsy: Facial nerve (CN VII) palsy
- Fractures: Clavicle, skull

⭐ Subgaleal hemorrhage is the most feared neonatal complication due to potential for massive, life-threatening blood loss into the loose areolar tissue space.

High-Yield Points - ⚡ Biggest Takeaways

Primary indications are a prolonged second stage of labor or non-reassuring fetal status.

Key prerequisites: fully dilated cervix, ruptured membranes, vertex presentation, and an engaged head (≥+2 station).

Forceps risk maternal trauma (e.g., 3rd/4th-degree tears) and fetal facial nerve palsy.

Vacuum extraction risks neonatal cephalohematoma and scalp lacerations.

Abandon for C-section after 3 failed attempts or vacuum "pop-offs".

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