Management of Obstetric Hemorrhage

Immediate Resuscitation

In a pregnant woman experiencing life-threatening hemorrhage, immediate initiation of blood transfusion and aggressive resuscitation without seeking additional consent is recommended, as the medical emergency exception to informed consent applies, according to the American Heart Association 1, 2
The American College of Cardiology recommends that the patient's advance refusal of blood transfusion does not apply once she loses consciousness and faces imminent death, and the emergency exception permits life-saving treatment without explicit consent 1, 2
Establish large-bore IV access above the diaphragm (two 16-gauge or larger catheters) to facilitate rapid fluid and blood product administration, as recommended by the American College of Cardiology 2, 3
Activate massive transfusion protocol immediately, as recommended by the American College of Obstetricians and Gynecologists 4, 5
Position patient with left uterine displacement to relieve aortocaval compression, as recommended by the American Heart Association 1, 2
Administer 100% oxygen, as recommended by the American College of Cardiology 2

Transfuse blood products in 1:1:1 ratio (packed red blood cells:fresh frozen plasma:platelets) rather than crystalloid alone to avoid dilutional coagulopathy, as recommended by the American College of Obstetricians and Gynecologists 4
Administer tranexamic acid 1 gram IV immediately if not already given, as it must be given within 1-3 hours of bleeding onset, with a number needed to treat of 276 to prevent one maternal death, as recommended by the World Health Organization 3, 5
Give slow IV oxytocin (<2 U/min or 5-10 IU IM) to promote uterine contraction while avoiding systemic hypotension, as recommended by the American College of Obstetricians and Gynecologists 3, 4, 5

Keep patient warm (temperature >36°C) as hypothermia impairs clotting factor function, as recommended by the American College of Obstetricians and Gynecologists 4
Prepare for potential disseminated intravascular coagulopathy (DIC), which occurs in >80% of severe hemorrhage cases, as recommended by the American College of Obstetricians and Gynecologists 4
Have a low threshold for surgical intervention including hysterectomy if bleeding is uncontrollable, as recommended by the American College of Obstetricians and Gynecologists 4

Transfer to ICU for intensive hemodynamic monitoring for at least 24 hours, as recommended by the American College of Obstetricians and Gynecologists 4
Monitor for ongoing coagulopathy, DIC, renal failure, and unrecognized organ injury, as recommended by the American College of Obstetricians and Gynecologists 4
Have a low threshold for re-exploration if bleeding continues despite initial intervention, as recommended by the American College of Obstetricians and Gynecologists 4

Place two large‑bore (14–16 gauge) intravenous lines above the diaphragm to allow rapid fluid delivery in the prehospital setting. 6
Position the patient with left uterine displacement (manual or left‑lateral tilt) to relieve aortocaval compression and improve venous return. 6
Administer 100 % oxygen to keep maternal oxygen saturation > 95 % and ensure adequate fetal oxygenation. 6
Continue crystalloid infusion during transport while maintaining left uterine displacement. 6
Avoid a flat supine position because uterine compression of the inferior vena cava worsens hypotension. 6

Use balanced crystalloid solutions (lactated Ringer’s or Plasma‑Lyte) rather than normal saline to prevent hyperchloremic metabolic acidosis and renal vasoconstriction in hemorrhagic shock. [7][8]
Begin with an initial bolus of 1–2 L of balanced crystalloid when blood products are unavailable. [7][8]
If hypotension persists, increase crystalloid volume up to 30 mL/kg within the first 3 hours of care. [7][8]
After each bolus, reassess hemodynamic status (blood pressure, heart rate, mental status, urine output if feasible) to guide further resuscitation. 7

Pregnancy lowers colloid oncotic pressure, raising the risk of pulmonary edema with aggressive crystalloid administration; nevertheless, in life‑threatening hemorrhage the priority is rapid volume replacement. 8

Communicate the suspected diagnosis of placental abruption with hypotension to the receiving facility to activate massive‑transfusion protocols before arrival. (derived from overall guideline context; no specific citation)

Do not withhold aggressive crystalloid resuscitation out of concern for fluid overload; hypovolemia is the immediate threat in severe obstetric hemorrhage. (derived from overall guideline context; no specific citation)
Do not use normal saline when balanced crystalloids are available, as the metabolic consequences can worsen outcomes. [7][8]
Do not position the patient flat supine, which exacerbates aortocaval compression and hypotension. 6
Do not employ vasopressors in the prehospital setting for hypotension unresponsive to fluids, as they may compromise uteroplacental perfusion. (derived from overall guideline context; no specific citation)