Preventing Maternal Mortality: Stopping Postpartum Hemorrhage

Postpartum hemorrhage (PPH) is one of the most common preventable causes of death in women of childbearing age worldwide. Even in countries with highly developed healthcare systems, women die from uncontrolled bleeding after delivery – often because initial management is delayed or unstructured. For emergency physicians and EMS personnel, PPH presents a particular challenge: the pathophysiology differs fundamentally from traumatic hemorrhage, the specific pharmacology is unfamiliar to many prehospital providers, and the dynamics of blood loss are routinely underestimated. This article provides a structured review of causes, diagnostics, and stepwise therapy – with a particular focus on the interface between obstetrics and emergency medicine.

Definition and Underestimation of Blood Loss

The classic definition of PPH is based on estimated blood loss:

• Primary PPH: Blood loss ≥ 500 ml after vaginal delivery or ≥ 1000 ml after cesarean section within the first 24 hours postpartum
• Severe PPH: Blood loss ≥ 1000 ml regardless of mode of delivery, associated with signs of hemodynamic instability
• Secondary PPH: Abnormal bleeding between 24 hours and 12 weeks postpartum

A central problem in acute care is the systematic underestimation of actual blood loss. Studies consistently show that visual estimation underestimates the real loss by 30–50%. Adding to the difficulty, women at term have a blood volume expanded by 30–50% – hemodynamic compensation can therefore be maintained for a prolonged period before abrupt collapse occurs. The young, healthy patient who "still looks stable" can decompensate into hemorrhagic shock within minutes.

Practical tip: Quantitative methods for blood loss determination (weighing of materials, calibrated collection bags) are clearly superior to visual estimation. In the prehospital setting, careful documentation of blood-soaked materials is essential.

The 4 T's: Systematic Search for the Cause

The etiology of PPH can be systematically captured using the 4 T's. This framework is not merely academic but immediately actionable – because therapy is directed at the identified cause.

Tone (70–80% of cases)

Uterine atony is by far the most common cause of PPH. The uterus fails to contract adequately after expulsion of the placenta, the spiral arteries in the placental bed are not mechanically compressed, and bleeding persists.

Risk factors:

• Uterine overdistension (polyhydramnios, multiple gestation, macrosomia)
• Prolonged or augmented labor
• Grand multiparity (≥ 5 deliveries)
• Chorioamnionitis
• Tocolytic administration before delivery

Clinical sign: The uterine fundus is soft, boggy on palpation and positioned high (above the umbilicus). Often the uterus cannot be delineated at all.

Trauma (approx. 20%)

Injuries to the birth canal can cause significant bleeding:

• Cervical lacerations (especially after operative vaginal delivery)
• Higher-degree perineal tears (grade III–IV)
• Vaginal lacerations and hematomas (including retroperitoneal!)
• Uterine rupture (rare but life-threatening – especially after prior cesarean section)
• Uterine inversion (a rarity but dramatic)

Important: In cases of persistent bleeding despite good uterine tone, an active search for a source of injury must be undertaken. In the prehospital setting, definitive repair of birth injuries is usually not possible – the focus is on tamponade, compression, and rapid transport.

Tissue (approx. 10%)

Retained placental tissue or membrane remnants prevent adequate uterine contraction. An incomplete placenta is often already recognizable on inspection – a missing cotyledon or torn membranes are warning signs.

Special case – Placenta accreta/increta/percreta: Here the placenta is pathologically adherent to the uterine wall. Manual removal leads to massive hemorrhage. This situation requires operative management, frequently a hysterectomy.

Thrombin (approx. 1–2%)

Coagulopathies as a primary cause of bleeding are rare, but they regularly occur as a secondary complication in massive hemorrhage:

• Pre-existing coagulation disorders (von Willebrand disease, platelet disorders)
• Pregnancy-specific coagulopathies (HELLP syndrome, DIC in amniotic fluid embolism, placental abruption)
• Dilutional coagulopathy from massive volume resuscitation
• Consumptive coagulopathy from prolonged bleeding

Key point: In any PPH that does not respond rapidly to uterotonics and mechanical measures, a developing coagulopathy must be considered and point-of-care diagnostics (viscoelastometry, blood gas analysis with lactate and calcium) should be pursued.

Stepwise Therapy of Postpartum Hemorrhage

PPH management follows an escalating stepwise approach. The transitions between steps are fluid and time-critical – clear team communication and early escalation are essential.

Step 1: Basic Measures and First-Line Uterotonics

• Uterine massage: Vigorous fundal massage through the abdominal wall. Simple, immediately available, and often remarkably effective. One hand grasps the fundus, the other supports from the suprapubic area.
• Bladder emptying: A full bladder impedes uterine contraction. Insert an indwelling catheter.
• Oxytocin: First-line agent. Dosing: 3–5 IU as a slow IV bolus (over 1–2 minutes; caution: hypotension with rapid administration), followed by a continuous infusion of 10–40 IU in 500–1000 ml crystalloid solution over 4 hours.

Step 2: Second-Line Uterotonics

If there is no response to oxytocin within a few minutes:

• Carbetocin: 100 µg IV as a single dose (longer half-life than oxytocin, not repeatable)
• Sulprostone (Nalador®): Prostaglandin E2 analogue. Dosing: 500 µg in 500 ml NaCl 0.9% IV over at least 60 minutes (infusion rate 100–500 ml/h). Caution: Maximum dose 1500 µg/24 h. Note contraindications: severe asthma, cardiovascular disease. Never administer as a bolus!
• Misoprostol: 800–1000 µg rectally or sublingually. Important in resource-limited settings and as bridging therapy. Less effective than sulprostone but temperature-stable and requires no infusion setup.
• Methylergonovine (Methergine®): 0.2 mg slowly IV or IM. Caution: Contraindicated in hypertension and preeclampsia – common in the obstetric population!
• Tranexamic acid: 1 g IV over 10 minutes, as early as possible (ideally within the first 3 hours of bleeding onset). If bleeding continues after 30 minutes, a repeat dose is possible. Evidence shows a significant reduction in bleeding-related mortality with early administration – tranexamic acid therefore belongs in the first-line therapy of every PPH.

Step 3: Mechanical and Interventional Measures

• Bimanual uterine compression (Hamilton maneuver): A fist is inserted vaginally into the anterior fornix, while the other hand compresses the fundus through the abdominal wall. This compresses the uterus between both hands. In the prehospital setting, this is the most important mechanical intervention. It requires overcoming hesitation – but is potentially lifesaving.
• Intrauterine balloon tamponade: A Bakri balloon or a Sengstaken-Blakemore tube is placed intrauterine and filled with 300–500 ml NaCl. The tamponade effect stops bleeding in many cases. If no specific balloon catheter is available, a urinary catheter with a large balloon can be improvised (condom-catheter tamponade).
• Aortic compression: In life-threatening hemorrhage, the aorta can be compressed against the spine – approximately at the level of the umbilicus with the fist. This dramatically reduces uterine blood flow and can buy time.

Step 4: Operative Management

These measures are reserved for the in-hospital setting:

• Uterine compression sutures (B-Lynch suture or modifications)
• Devascularization (ligation of the uterine arteries or internal iliac arteries)
• Interventional radiology (embolization of uterine vessels)
• Hysterectomy as a last resort

PPH in the Prehospital Setting: Specific Challenges

For emergency physician services and EMS personnel, specific challenges arise that require a structured approach:

Common Dispatch Scenarios

• Out-of-hospital delivery (planned home birth, unplanned delivery in the ambulance, breech delivery)
• PPH after discharge from the labor ward (early discharge, outpatient delivery)
• Secondary PPH days to weeks after delivery

Structured Approach: The ABCDE of PPH

1. A/B: Airway management and oxygenation – in cases of altered consciousness, consider early intubation (Caution: Increased aspiration risk in the peripartum period, airway edema!)
2. C – Circulation: Two large-bore IV lines (≥ 16 G), aggressive volume resuscitation initially with balanced crystalloids, early tranexamic acid 1 g IV.
3. C – Cause: In parallel with stabilization: work through the 4 T's. Palpate the uterus! Is the fundus soft? → Atony → Massage + Oxytocin. Has the placenta been delivered? Is it complete? → Tissue. Active bleeding visible from the birth canal? → Trauma.
4. D/E: Level of consciousness, temperature (avoid hypothermia! – part of the lethal triad)

Prehospital Pharmacotherapy – What Should Be in the Emergency Physician's Kit?

Medication	Dose	Route	Notes
Oxytocin	3–5 IU	Slowly IV	First line
Tranexamic acid	1 g	IV over 10 min	Administer early
Misoprostol	800–1000 µg	Rectal/sublingual	If no IV access
Sulprostone	500 µg	IV infusion (never as bolus!)	Only with monitoring

Common Errors in Prehospital Management

• Underestimation of blood loss – The most common pitfall. Blood seeps posteriorly into bedding, clothing, and onto the floor.
• Delayed uterotonic administration – Oxytocin must be given as quickly as possible, not only upon hospital arrival.
• Forgetting uterine massage – Simple, effective, free, immediately available.
• Omitting tranexamic acid – Despite good evidence, it is frequently forgotten in the prehospital setting.
• Delayed alerting/escalation – PPH often escalates faster than expected. Pre-notify the trauma bay or obstetric department early. Have massive transfusion protocols activated.
• Hypothermia – The patient is lying on a wet surface, undressed, and the room is cold. Active warming management begins in the prehospital phase.

Communication and Team Dynamics

PPH is a team emergency. Critical incident reporting studies show that communication deficits – not lack of medical knowledge – are the most common factor in preventable PPH deaths. Best practices include:

• Clear role assignment: Who performs uterine massage? Who administers medications? Who documents?
• Closed-loop communication: Orders are spoken aloud and confirmed back.
• Time announcements: "Bleeding has been ongoing for 10 minutes, estimated loss over 1000 ml."
• Escalation triggers: Predefined thresholds at which the next therapy level is initiated minimize delays.

Damage Control Resuscitation in Massive PPH

In massive hemorrhage, the principles of damage control resuscitation apply – adapted to peripartum physiology:

• Permissive hypotension is controversial in PPH – the bleeding source (uterus) is not surgically compressible as in penetrating trauma. The recommendation therefore trends toward a target systolic blood pressure of ≥ 90 mmHg.
• Calcium supplementation: Calcium is essential for both coagulation AND uterine contraction. With massive transfusion, ionized calcium levels drop due to citrate binding. 10 ml calcium gluconate 10% IV with every fourth unit transfused – or better: guided by ionized calcium levels on blood gas analysis.
• Fibrinogen replacement: Fibrinogen drops rapidly in PPH. A level < 2 g/L is predictive of severe hemorrhage. Target: ≥ 2 g/L. Replacement with fibrinogen concentrate (initially 2–4 g IV) or via fresh frozen plasma.
• Avoiding the lethal triad: Hypothermia – Acidosis – Coagulopathy. Each of these factors worsens coagulation. Active warming, acidosis correction, and early coagulation therapy are equally important as surgical hemostasis.

Prevention: Active Management of the Third Stage of Labor

The best PPH is the one that never occurs. Active management of the third stage of labor significantly reduces the risk of PPH:

• Prophylactic oxytocin administration (3–5 IU IV or 10 IU IM) immediately after delivery of the infant
• Controlled cord traction when signs of placental separation appear
• Early uterine massage after placental expulsion

Even in the prehospital setting – such as during out-of-hospital deliveries – this prophylaxis should be consistently performed.

Practical Training

Postpartum hemorrhage is one of those emergency situations that, due to its rarity in individual experience and its simultaneously enormous dynamics, can only be mastered through regular, realistic training. Correct bimanual compression, the structured search for causes using the 4 T's, the dosing and contraindications of uterotonics, and coordinated team management under time pressure cannot be learned from texts alone. In the Emergency Physician Refresher Course by Simulation Tirol, you train exactly these critical scenarios on realistic simulation models, with structured debriefing and evidence-based feedback – so that every step is second nature when it matters most.