9.6 Hemorrhage Resuscitation, Uterotonics, TXA & Surgical Escalation

Stepwise Resuscitation Algorithm: The Midwifery Bundle

The American College of Obstetricians and Gynecologists (ACOG) and the California Maternal Quality Care Collaborative (CMQCC) establish a four-stage clinical algorithm for managing obstetric hemorrhage.

Stage 0: Universal Prevention & Risk Assessment

• Active management of the third stage of labor (AMTSL) for all births: (1) prophylactic oxytocin administration (10 IU IM or 10–40 IU IV in 1,000 mL crystalloid) upon delivery of the anterior shoulder or immediately following infant delivery, (2) gentle controlled cord traction with counter-traction on the supra-pubic abdomen (Brandt-Andrews maneuver), and (3) vigorous post-delivery fundal massage.

Stage 1: Recognition & Early Intervention

• Triggers: Cumulative blood loss >500 mL (vaginal) or >1,000 mL (cesarean) with continued bleeding, or any vital sign deviation (HR ≥110 bpm, BP ≤85/45 mmHg, Shock Index ≥0.9).
• Immediate Midwifery Actions:
  1. Call for Assistance: Mobilize bedside nursing, second midwife, and obstetrician.
  2. Bimanual Uterine Compression: Perform immediate vigorous external fundal massage. If atony persists, insert a sterile gloved hand into the vagina, form a fist in the anterior vaginal fornix, and compress the anterior uterine wall against the external hand pressing firmly against the posterior fundus through the abdominal wall.
  3. Bladder Decompression: Insert an indwelling Foley catheter to empty the bladder. A distended bladder mechanically elevates and shifts the uterus laterally, directly preventing effective myometrial contraction.
  4. Venous Access: Ensure two large-bore peripheral intravenous lines (16- or 18-gauge) are patent.
  5. Fluid Resuscitation: Infuse warm isotonic crystalloids (Lactated Ringer's) rapidly; avoid excessive unbuffered saline to prevent hyperchloremic acidosis.
  6. Stat Laboratory Orders: Complete blood count (CBC), baseline coagulation panel (PT/INR, aPTT, fibrinogen), and Type & Crossmatch for 2 to 4 units of packed red blood cells (PRBCs).
  7. Initiate First-Line Uterotonics: Escalate immediately along the pharmacologic sequence.

---

Pharmacologic Uterotonic Sequence & Contraindications

When uterine atony fails to resolve with fundal massage and oxytocin, second- and third-line uterotonics must be administered without delay. The certified nurse-midwife must master the dosing, route, physiological mechanism, adverse effect profiles, and strict absolute contraindications for each agent.

[!CRITICAL] AMCB Exam Core Rule: Always check the patient's blood pressure and respiratory history prior to administering second-line uterotonics!

• If the patient is HYPERTENSIVE (preeclampsia, gestational HTN, chronic HTN): NEVER give Methergine — use Carboprost or Misoprostol.
• If the patient has ASTHMA or reactive airway disease: NEVER give Carboprost (Hemabate) — use Methergine (if normotensive) or Misoprostol.

---

Tranexamic Acid (TXA) & The WOMAN Trial

The World Maternal Antifibrinolytic (WOMAN) trial, a landmark randomized placebo-controlled trial of over 20,000 individuals with postpartum hemorrhage, transformed clinical practice:

• Administration of 1 g IV tranexamic acid infused over 10 minutes significantly reduced maternal mortality due to bleeding by almost one-third when given early.
• The 3-Hour Time Window: The survival benefit was greatest when TXA was administered as early as possible after bleeding onset. When administration was delayed beyond 3 hours postpartum, the survival benefit was completely lost, and a trend toward increased adverse events was observed.
• Repeat Dosing: A second 1 g IV dose is administered if bleeding continues after 30 minutes, or if bleeding restarts within 24 hours of the initial dose.
• TXA is an antifibrinolytic, not a uterotonic; it prevents the breakdown of established fibrin clots and should be administered in conjunction with, not as a replacement for, standard uterotonic agents.

---

Stage 2 & 3 Mechanical, Surgical & Transfusion Interventions

When uterine atony or lower uterine segment bleeding persists despite aggressive uterotonic therapy and bimanual compression, mechanical and surgical escalation is required.

Surgical & Interventional Escalation Ladder
├── 1. Intrauterine Balloon Tamponade (Bakri Balloon filled with 300 - 500 mL sterile saline)
├── 2. Vacuum-Induced Uterine Tamponade (Jada system)
├── 3. Uterine Compression Sutures (B-Lynch or Hayman sutures)
├── 4. Stepwise Uterine Artery Ligation (O'Leary stitches) & Hypogastric Artery Ligation
├── 5. Interventional Radiology: Uterine Artery Embolization (UAE - if hemodynamically stable)
└── 6. Emergency Peripartum Hysterectomy (Definitive life-saving intervention)

1. Intrauterine Balloon Tamponade (Bakri Balloon)

• Mechanism: A sterile silicone balloon catheter designed specifically for the uterine cavity. When inflated, it exerts uniform inward-to-outward hydrostatic pressure against the endometrial vasculature and myometrial walls, arresting capillary and venous bleeding.
• Placement & Inflation: The balloon is inserted through the cervix into the uterine cavity under ultrasound or direct tactile guidance. It is inflated with 300 to 500 mL of sterile warm saline (never air or carbon dioxide).
• The "Tamponade Test": Following inflation, the central drainage lumen is connected to a collection bag. If bleeding stops or decreases to minimal serosanguinous drainage (<50 mL/hr), the test is positive (successful). If vigorous, bright red blood continues to pour through the drainage port or around the balloon into the vagina, the test is negative, and immediate surgical intervention is indicated.
• Maintenance: The balloon is typically left in place for 12 to 24 hours, accompanied by a continuous maintenance oxytocin infusion (to prevent uterine relaxation around the balloon) and broad-spectrum antibiotic prophylaxis.

2. Massive Transfusion Protocol (MTP)

Activated when blood loss exceeds 1,500 mL, shock index is ≥1.0, or there is clinical evidence of uncompensated shock and rapid ongoing hemorrhage.

• The 1:1:1 Ratio: Modern damage-control resuscitation avoids excessive crystalloid infusion (which worsens hypothermia, acidemia, and dilutional coagulopathy). Blood products are transfused in a balanced 1:1:1 ratio: 1 unit of Packed Red Blood Cells (PRBCs) : 1 unit of Fresh Frozen Plasma (FFP) : 1 unit of Platelets.
• Target Parameters: Maintain maternal hemoglobin >8.0 g/dL, platelet count >50,000/mcL, serum fibrinogen >150 to 200 mg/dL, and PT/INR <1.5.
• Cryoprecipitate: If serum fibrinogen remains <150–200 mg/dL despite FFP, administer 10 units of cryoprecipitate (rich in fibrinogen, factor VIII, and vWF).
• Hypothermia & Acidosis Prevention: Active maternal warming (forced-air blankets, fluid warmers) to keep core temperature >36.0°C (96.8°F), as coagulation factor enzymes become profoundly inactive in hypothermic and acidemic environments.