10.2 Intrapartum Management & Postpartum Care
Key Takeaways
- First stage of labor is divided into latent (up to 6 cm) and active (6–10 cm) phases, and active phase arrest is diagnosed after 4 hours of adequate contractions or 6 hours of inadequate contractions without cervical change.
- Postpartum hemorrhage is defined as blood loss ≥1000 mL with hypovolemia, managed initially with bimanual massage and oxytocin, followed by methylergonovine, carboprost, or misoprostol.
- Methylergonovine is contraindicated in hypertensive patients, and carboprost tromethamine is contraindicated in patients with asthma.
- Lactational mastitis is treated with oral antibiotics covering Staphylococcus aureus (e.g., dicloxacillin), and the patient must continue breastfeeding or pumping from the affected breast.
- Combined hormonal contraceptives are contraindicated in the first 21 days postpartum due to increased venous thromboembolism risk and potential negative effects on breast milk supply.
Intrapartum Management & Postpartum Care: Process, Complications, and Recovery
Quick Answer: Intrapartum management tests recognition of labor progress and timing of interventions—know the thresholds for active phase arrest (≥6 cm, no change for 4 hours with adequate contractions or 6 hours without) and second-stage arrest. In postpartum hemorrhage, prioritize the 'Four Ts,' initiating bimanual massage and oxytocin before escalating to second-line uterotonics (avoiding Methergine in hypertension and Hemabate in asthma).
Stages of Labor and Progress
Labor is divided into three stages. The first stage begins with regular, painful uterine contractions and ends when the cervix is fully dilated (10 cm). It is subdivided into the latent phase (cervical change up to 6 cm) and the active phase (rapid cervical dilation from 6 cm to 10 cm). Normal progress in the active phase is at least 1 cm/hour in nulliparous women and 1.2 cm/hour in multiparous women. The second stage begins at full dilation and ends with fetal delivery. The third stage begins after fetal delivery and ends with placental delivery. Labor dystocia refers to abnormally slow or arrested labor. Active phase protraction occurs when dilation is slower than expected (less than 1–2 cm/hour), managed with amniotomy and oxytocin. Active phase arrest is diagnosed in the active phase (at least 6 cm dilated with ruptured membranes) if there is no cervical change for 4 or more hours despite adequate contractions (defined as >200 Montevideo units [MVUs] on an intrauterine pressure catheter [IUPC], calculated by summing the amplitudes of contractions in a 10-minute window), or for 6 or more hours if contractions are inadequate. The treatment for active phase arrest is Cesarean delivery. Second-stage arrest is diagnosed when there is no descent or rotation after 3 hours of pushing in nulliparous women (4 hours with epidural) or 2 hours in multiparous women (3 hours with epidural). If the fetal head is engaged (+2 station or lower) and the cervix is fully dilated, operative vaginal delivery (vacuum or forceps) can be attempted; otherwise, Cesarean delivery is indicated.
Postpartum Hemorrhage (PPH) Management
Postpartum hemorrhage (PPH) is cumulative blood loss ≥1000 mL or blood loss with signs of hypovolemia within 24 hours of birth. Prophylaxis via active management of the third stage of labor—including prophylactic oxytocin administration upon delivery of the anterior shoulder, gentle umbilical cord traction, and uterine massage—significantly reduces PPH rates. The causes of PPH are categorized by the 'Four Ts': Tone (uterine atony), Tissue (retained placenta), Trauma (lacerations or uterine inversion), and Thrombin (coagulopathy). Uterine atony is the most common cause (80%) and presents with a soft, boggy uterus. Risk factors include uterine overdistension, prolonged labor, chorioamnionitis, and high parity. Initial management includes bimanual uterine massage and intravenous oxytocin. If bleeding persists, second-line uterotonics are administered.
Uterotonic Agents for Postpartum Hemorrhage
The following table outlines the dosing, contraindications, and key clinical considerations for the first- and second-line pharmacotherapy of uterine atony:
| Agent | Class | Route | Contraindications | Clinical Considerations |
|---|---|---|---|---|
| Oxytocin (Pitocin) | Peptide Hormone | IV or IM | None (first-line) | Preferred initial drug; administered as continuous infusion; monitor for water intoxication / hyponatremia. |
| Methylergonovine (Methergine) | Ergot Alkaloid | IM (never IV) | Hypertension / Preeclampsia | Causes rapid smooth muscle contraction; can precipitate hypertensive crisis or stroke. |
| Carboprost Tromethamine (Hemabate) | Prostaglandin F2-alpha | IM | Asthma | Promotes uterine contraction; can cause bronchoconstriction, severe diarrhea, and pyrexia. |
| Misoprostol (Cytotec) | Prostaglandin E1 | Rectal or Buccal | None | Useful when IV access is lost; slow onset but safe in asthma and hypertension. |
| Tranexamic Acid (TXA) | Antifibrinolytic | IV | Thromboembolic disease | Administer within 3 hours of birth; reduces mortality from obstetric hemorrhage. |
If medical therapy fails, intrauterine tamponade (Bakri balloon) is inserted. Refractory bleeding requires surgical intervention (B-Lynch sutures, uterine artery ligation, or hysterectomy). Retained placenta requires manual extraction or curettage. Genital tract lacerations require repair. Uterine inversion requires immediate manual replacement of the uterus before removing the placenta; uterine relaxants (nitroglycerin or terbutaline) facilitate replacement, followed by uterotonics after repositioning.
Lactation Management and Complications
Lactation complications require careful differentiation. Breast engorgement occurs 3–5 days postpartum as milk production begins, presenting with bilateral, warm, swollen, and painful breasts. Treatment for breastfeeding women includes frequent nursing, warm compresses before feeding to facilitate let-down, and cool compresses between feedings. For non-breastfeeding women, manage by suppressing lactation: avoid breast stimulation, wear a tight supportive bra, apply ice packs, and use NSAIDs. Lactational mastitis is a localized bacterial infection, most commonly caused by Staphylococcus aureus. It presents with unilateral breast erythema, warmth, pain, and fever. Unlike engorgement, mastitis requires oral antibiotics (cephalexin or dicloxacillin; trimethoprim-sulfamethoxazole or clindamycin if MRSA is suspected). Patients must continue breastfeeding or pumping from the affected breast to prevent milk stasis, which can lead to abscess. A breast abscess presents as a fluctuant, tender, erythematous mass. Ultrasound is the diagnostic gold standard. Management requires drainage (ultrasound-guided needle aspiration is preferred over incision and drainage) and antibiotics. Breastfeeding can continue from the affected breast unless the incision or drainage site interferes with latch.
Postpartum Contraception
Combined hormonal contraceptives (pills, patch, ring) are contraindicated in the first 21 days postpartum (and up to 42 days in patients with additional venous thromboembolism [VTE] risk factors) due to hypercoagulability. Combined methods can also decrease milk production in breastfeeding women. Progestin-only options (progestin-only pills, depot medroxyprogesterone, or the subdermal etonogestrel implant [Nexplanon]) and non-hormonal methods (barrier methods, copper IUD) do not affect milk supply and can be initiated immediately postpartum. The levonorgestrel-releasing intrauterine device (IUD) and copper IUD can be inserted within 10 minutes of placental delivery (immediate post-placental insertion), though patients have a higher expulsion rate compared to insertion at the 6-week postpartum visit. The lactational amenorrhea method (LAM) provides effective contraception only if the patient is exclusively breastfeeding (at intervals <4 hours during the day and <6 hours at night), remains amenorrheic, and is within 6 months of delivery.
A 24-year-old G1P0 at 39 weeks gestation has been in active labor for several hours. Her cervix is 7 cm dilated, 100% effaced, and the fetus is at 0 station. Membranes are ruptured. An intrauterine pressure catheter is in place. Over the last 4 hours, there has been no cervical change. The uterine contraction pattern shows a baseline-to-peak amplitude sum of 220 Montevideo units (MVUs) over a 10-minute period. What is the most appropriate next step in management?
A 32-year-old G3P3 patient develops severe postpartum hemorrhage immediately after vaginal delivery of a 4.2 kg infant. On physical exam, the uterus is soft, boggy, and palpated at the level of the umbilicus. Bimanual uterine massage is performed, and intravenous oxytocin is administered. Despite these measures, significant vaginal bleeding continues. The patient's blood pressure is 155/96 mmHg, and she has a history of mild asthma. Which of the following is the most appropriate next pharmacological agent to administer?
A 28-year-old breastfeeding G1P1 patient presents to the clinic 4 weeks postpartum complaining of severe pain, redness, and swelling of her left breast. She also reports a fever of 38.4°C (101.1°F) and generalized body aches. Physical exam reveals a localized, warm, tender, and erythematous area on the lateral left breast without fluctuance. What is the most appropriate management?