Obstetric and Gynecological Nursing

Obstetric and gynecological (OB/GYN) nursing is a specialty that encompasses the care of women during pregnancy, childbirth, and the postpartum period (obstetrics), as well as the care of women with reproductive health conditions across the lifespan (gynecology). In the UAE, where maternal and child health are national priorities, and where the population has high birth rates and a significant proportion of women of reproductive age, OB/GYN nurses are in constant demand. The HAAD examination tests OB/GYN nursing knowledge across several domains: normal pregnancy and childbirth, complications of pregnancy, family planning, and common gynecological conditions.

Menstrual Cycle and Reproductive Hormones

Understanding the menstrual cycle is fundamental to understanding pregnancy, fertility, and many gynecological disorders.

Phases of the Menstrual Cycle:

Follicular (Proliferative) Phase (Days 1–14): Triggered by FSH (Follicle-Stimulating Hormone) from the anterior pituitary. FSH stimulates the development of ovarian follicles in the ovary. As follicles mature, they produce estrogen, which:

• Stimulates the endometrium to proliferate (endometrial thickness increases from ~1 mm to ~8–10 mm)
• Causes cervical mucus to become thin, clear, and stretchy (spinnbarkeit) — facilitating sperm transport
• Exerts negative feedback on FSH (when estrogen rises sufficiently, it switches to positive feedback)

Ovulation (Day 14 in a 28-day cycle): Triggered by a surge in LH (Luteinizing Hormone) from the anterior pituitary, caused by the sharp rise in estrogen from the dominant follicle. LH surge causes the mature follicle to rupture and release the secondary oocyte (ovum). The ovum is viable for 12–24 hours. The LH surge is the most reliable indicator of impending ovulation.

Luteal (Secretory) Phase (Days 15–28): After ovulation, the ruptured follicle collapses and forms the corpus luteum (yellow body), which produces progesterone and some estrogen. Progesterone:

• Converts the endometrium from proliferative to secretory (prepares it for implantation)
• Causes cervical mucus to become thick, opaque, and scant — hostile to sperm
• Causes basal body temperature to rise ~0.5°C (basis of temperature method of family planning)
• Acts on the hypothalamus to suppress GnRH → suppresses FSH and LH (no new ovulation)

If fertilization and implantation do not occur, the corpus luteum degenerates (by day 22–24) → progesterone falls → endometrium breaks down → menstruation begins on day 28.

Key hormones: GnRH (hypothalamus), FSH (anterior pituitary), LH (anterior pituitary), Estrogen (ovarian follicles), Progesterone (corpus luteum), hCG (trophoblast — after fertilization).

Normal Pregnancy

Signs of Pregnancy:

• Presumptive: Amenorrhea, nausea and vomiting (morning sickness — occurs in 70–80%), breast tenderness, urinary frequency, fatigue, quickening (first fetal movements — felt at 16–20 weeks in multiparas, 18–20 weeks in primigravidas), linea nigra, chloasma (melasma — skin pigmentation on face)
• Probable: Positive pregnancy test (detects hCG), Goodell’s sign (cervical softening), Hegar’s sign (uterine isthmus softening), Chadwick’s sign (cervical/vaginal color change to violet), Ballottement (fetal rebound on vaginal examination), Braxton Hicks contractions
• Positive: Fetal heart sounds (Doppler at 10–12 weeks, fetoscope at 20 weeks), fetal movements felt by examiner, visualization of fetus on ultrasound

Anatomical and Physiological Changes in Pregnancy:

Cardiovascular:

• Blood volume increases by 40–50% (peaks at 32 weeks)
• Cardiac output increases by 30–50%
• HR increases by 10–15 bpm
• BP may decrease slightly in 2nd trimester (decreased peripheral vascular resistance) then return to pre-pregnancy levels
• Supine hypotensive syndrome (vena cava compression): avoid supine position after 20 weeks

Respiratory:

• Tidal volume increases by 30–40%
• RR slightly increased
• Diaphragmatic elevation as uterus enlarges
• Dyspnea of pregnancy is common and benign

Renal:

• GFR increases by 50%
• Renal plasma flow increases
• Ureteral dilation (more on right, due to uterine compression of right ureter)
• Urinary frequency (especially in first and third trimesters)

Hematological:

• Hemodilution (physiological anemia of pregnancy)
• Hypercoagulable state (increased clotting factors, decreased protein S) — increased risk of DVT

Gravid uterus: At 20 weeks, the fundus is at the umbilicus. At 36 weeks, it reaches the xiphoid process. After 36 weeks, it may descend as the fetal head engages (lightening).

Labor and Delivery

Stages of Labor:

First Stage (Latent phase): Onset of regular contractions to cervical dilation of 5–6 cm. Cervical change is slow. May last up to 20 hours in primigravidas, up to 14 hours in multigravidas.

First Stage (Active phase): Cervical dilation from 5–6 cm to 10 cm (complete). More rapid dilation (~1 cm/hour in primigravidas; ~1.5 cm/hour in multigravidas). Contractions more regular and intense.

Second Stage (Pushing stage): Full cervical dilation (10 cm) to delivery of the baby. Active pushing when urge to bear down is felt. Duration: up to 2–3 hours in primigravidas (with epidural: up to 4 hours); up to 1–2 hours in multigravidas.

Third Stage: Delivery of baby to delivery of placenta. Should take no more than 30 minutes (if > 30 minutes, manual removal may be needed). Signs of placental separation: uterus becomes globular, cord lengthens, gush of blood.

Fourth Stage: First hour after placental delivery — period of maximum risk for postpartum hemorrhage. Monitor closely: vital signs, fundal height and firmness, vaginal bleeding, bladder distension.

Mechanism of Labor (Cardinal movements):

1. Engagement (fetal head enters pelvic inlet)
2. Descent
3. Flexion (chin to chest)
4. Internal rotation (head rotates to fit AP diameter)
5. Extension (head emerges under symphysis pubis)
6. External rotation (shoulders rotate to align with AP diameter)
7. Expulsion (shoulders and body delivered)

Postpartum Care

Postpartum assessment — BUBBLE HE:

• Breasts: Assess for engorgement, cracks, infection
• Uterus: Fundal height (should be at or below umbilicus immediately postpartum; descends 1 cm/day; should not be palpable after 10–14 days); firmness (should be firm — boggy uterus → postpartum hemorrhage)
• Bladder: Urinary retention common; encourage voiding within 6–8 hours; full bladder can cause uterine atony and hemorrhage
• Bowels: Constipation common (analgesics, iron supplements, fear of pain from hemorrhoids/episiotomy); encourage high-fiber diet, fluids, stool softeners
• Lochia: Postpartum vaginal discharge. Rubra (days 1–3, red, bloody); Serosa (days 4–10, pink/brown); Alba (day 11 onwards, white/cream, may last 2–6 weeks)
• Episiotomy/lacerations: Assess for redness, swelling, drainage, approximation
• Homans’ sign: Not reliable — don’t assess for DVT this way
• Emotional status: Baby blues (transient mood changes, days 3–5 postpartum, resolves by day 10–14); postpartum depression (persistent, severe, requires treatment)

Postpartum hemorrhage (PPH):

• Primary PPH: Blood loss > 500 mL (vaginal) or > 1000 mL (cesarean) within 24 hours of delivery
• Causes (4 T’s): Tone (uterine atony — most common, 70%); Trauma (lacerations, hematomas); Tissue (retained placental tissue); Thrombin (coagulopathy)
• Nursing management: Uterine massage; empty bladder; oxytocin infusion; bimanual compression if uncontrolled; prepare for surgical intervention if medical management fails

Family Planning and Contraception

Method	Mechanism	Advantages	Disadvantages/Contraindications
Combined oral contraceptive (COC)	Suppresses ovulation (estrogen + progestin)	Highly effective; regulates cycles; reduces dysmenorrhea; reduces ovarian/uterine cancer risk	Thromboembolism risk (smoking >35 yrs = contraindicated); breast cancer; liver disease; hypertension
Progestin-only pill (POP/mini-pill)	Thickens cervical mucus; prevents ovulation	Safe for breastfeeding; no estrogen-related risks	Must be taken same time daily; less effective than COC
IUCD (Mirena/coil)	Copper coil: spermicidal; Hormonal (Mirena): thickens mucus, thin endometrium	Long-acting (5–10 years); reversible; breastfeeding-safe	Cramping, heavy bleeding (copper); insertion requires trained provider
Injectables (Depo-Provera)	Progestin IM every 3 months; inhibits ovulation	Highly effective; private	Irregular bleeding; weight gain; bone density concerns; delayed return of fertility
Implants (Nexplanon)	Progestin rod inserted in arm; 3 years	Highly effective; long-acting; discreet	Irregular bleeding; requires insertion/removal by trained provider
Male condoms	Physical barrier; also prevents STIs	Readily available; no hormonal side effects; protects against STIs	Decreased sensation; breakage; latex allergy
Female condoms	Physical barrier	Protects against STIs	Less effective than male condoms
Emergency contraception (Levonorgestrel/Ulipristal)	Prevents ovulation; copper IUCD: spermicidal	Emergency use; copper IUCD most effective	Not for regular use; must be taken within 72 hours (Levonorgestrel) or 120 hours (Ulipristal)

⚡ Exam tip: During labor, the fetal head flexes to present the smallest diameter (suboccipitobregmatic). The 4 T’s of postpartum hemorrhage: Tone (most common), Trauma, Tissue, Thrombin. Baby blues resolve by 2 weeks postpartum; postpartum depression persists and requires treatment. The corpus luteum produces progesterone throughout the first trimester (until the placenta takes over — luteoplacental shift at 8–10 weeks).

---

Content adapted based on your selected roadmap duration. Switch tiers using the selector above.