Postpartum Hemorrhage in Emergency Medicine

Updated: Dec 16, 2016
  • Author: Maame Yaa A B Yiadom, MD, MPH; Chief Editor: Bruce M Lo, MD, MBA, CPE, RDMS, FACEP, FAAEM, FACHE  more...
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Overview

Practice Essentials

Defining postpartum hemorrhage (PPH) has historically been difficult. Waiting for a patient to meet PPH criteria, particularly in resource-poor settings or in cases of sudden hemorrhage, may delay appropriate intervention. Any bleeding that has the potential to result in hemodynamic instability, if left untreated, should be considered PPH and managed accordingly. PPH can be divided into 2 types: early (< 24 hours after delivery) and late (24 hours to 6 weeks after delivery). Most cases of PPH (>99%) are early.

Signs and symptoms

The clinical history should begin with consideration of signs and symptoms that are most crucial in managing potential circulatory collapse, identifying the cause of PPH, and selecting therapies, as follows.

Severity of bleeding:

  • Is the placenta delivered?
  • What has been the duration of the third stage of labor?
  • How long has the bleeding been heavy?
  • Was initial postdelivery bleeding light, medium, or heavy?
  • Are symptoms of hypovolemia present?
  • In delayed PPH, what is the bleeding pattern since delivery?

Intervention guides:

  • Is there a history of transfusion or transfusion reaction? What was the reason for transfusion?
  • Past medical history
  • Allergies

Predisposing factors and potential etiology:

  • History of PPH
  • Gravity, parity, length of most recent pregnancy, history of multiple gestations
  • Number of fetuses for the most recent pregnancy
  • Pregnancy complications
  • Spontaneous versus manual delivery of the placenta
  • Vaginal delivery versus cesarean delivery, current and past
  • Cesarean delivery – Planned in advance, decided on after a failed vaginal delivery attempt, or performed on an emergency basis
  • Other uterine surgeries
  • Personal or family history of bleeding disorder
  • Medications
  • Vaginal penetration since delivery
  • Signs or symptoms of infection
  • Other information helpful for continued management
  • Time and location of delivery, and any assistant(s) involved
  • Location and provider of prenatal care
  • Health of infant at delivery and any complications or concerns before, during, or after delivery

Past surgical history

The physical examination should focus on determining the cause of the bleeding. Important organ systems to assess include the following:

  • Pulmonary (pulmonary edema)
  • Cardiovascular (heart murmur, tachycardia, strength of peripheral pulses)
  • Neurologic (mental status changes from hypovolemia)

Specifically, examination should include the following:

  • Abdominal examination
  • Perineal examination
  • Speculum examination of the cervix and vagina
  • Bimanual examination
  • Placental examination

See Presentation for more detail.

Diagnosis

Laboratory studies that may be helpful include the following:

  • Complete blood count (CBC) with hemoglobin and hematocrit
  • Coagulation studies
  • Electrolytes
  • Blood urea nitrogen (BUN) and creatinine
  • Type and crossmatch
  • Liver function tests (LFTs), amylase, lipase
  • Lactate

Imaging studies to be considered include the following:

  • Ultrasonography – This is a fast and helpful modality for imaging pelvic structures and should be the first-line study for pelvic pathology
  • Computed tomography (CT) – This may be a helpful follow-up study when ultrasonography is not diagnostic and may also be the first-line study when a pelvic hematoma or abscess is suspected
  • Magnetic resonance imaging (MRI) – This study can help determine whether a fluid collection (hematoma or abscess) is intrauterine or extrauterine when ultrasonography or CT does not; it can also help to distinguish a placenta accreta from simple retained products of conception

See Workup for more detail.

Management

Prehospital care includes the following:

  • Primary survey of the mother (vital signs, ABCs)
  • Immediate interventions as appropriate – Gentle massage of the uterine fundus; fluid resuscitation with crystalloids; packing of any visible perineal lacerations; oxytocin
  • Minimal measure necessary on scene to stabilize the mother and baby for transport and further care

Emergency department care includes the following:

  • History and physical examination according to acute life support algorithms
  • Immediate OB/GYN consultation
  • Primary survey (ABCs)
  • Laboratory studies (including blood cultures if the patient is febrile or the vaginal blood/discharge is malodorous)
  • Secondary survey – Focused physical examination; bedside ultrasonography (FAST)
  • Interventions to address specific presentations as appropriate – Uterine atony; uterine rupture; trauma; retained placental tissue; uterine inversion; thrombosis

Immediate consultation with an OB/GYN is vital. If no OB/GYN is available, a general surgeon should be consulted. Direct contact with the blood bank is essential for assuring timely arrival of any blood products ordered.

See Treatment and Medication for more detail.

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Background

Defining postpartum hemorrhage (PPH) is problematic and has been historically difficult. Waiting for a patient to meet the postpartum hemorrhage criteria, particularly in resource-poor settings or with sudden hemorrhage, may delay appropriate intervention. Postpartum hemorrhage is traditionally defined as blood loss greater than 500 mL during a vaginal delivery or greater than 1,000 mL with a cesarean delivery. However, significant blood loss can be well tolerated by most young healthy females, and an uncomplicated delivery often results in blood loss of more than 500 mL without any compromise of the mother's condition.

The addition of "a 10% drop in hemoglobin" to the definition provides an objective laboratory measure. However, this is not helpful in acute situations since it can take hours for losses to create laboratory changes in red blood cell measurements. Signs and symptoms of hypovolemia (lightheadedness, tachycardia, syncope, fatigue and oliguria) are also of limited utility as they can be late findings in a young and otherwise healthy female. As a result, any bleeding that has the potential to result in hemodynamic instability, if left untreated, should be considered postpartum hemorrhage and managed accordingly.

Postpartum hemorrhage can be divided into 2 types: early postpartum hemorrhage, which occurs within 24 hours of delivery, and late postpartum hemorrhage, which occurs 24 hours to 6 weeks after delivery. Most cases of postpartum hemorrhage, greater than 99%, are early postpartum hemorrhage. Notably, most women are still under the care of their delivering provider during this time. With many women delivering outside of hospitals and early postpartum hospital discharge being a growing trend, postpartum hemorrhage that presents to the emergency department may be either early or late.

Within this combined population, emergency medicine providers are likely to receive patients that fall into 1 of 3 categories:

  • Those that are too close to delivery to be transferred to another location (the facility's labor and delivery suite or to another facility)
  • Women who delivered at home, at a nonhospital facility, or en route to the hospital and are too hemodynamically unstable to be transferred to a labor and delivery floor within the facility or at another location
  • Patients who were discharged home after delivery in stable condition, but had concerning bleeding that prompted an emergency department visit
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Pathophysiology

At term, the uterus and placenta receive 500-800 mL of blood per minute through their low resistance network of vessels. This high flow predisposes a gravid uterus to significant bleeding if not well physiologically or medically controlled. By the third trimester, maternal blood volume increases by 50%, which increases the body's tolerance of blood loss during delivery.

Following delivery of the fetus, the gravid uterus is able to contract down significantly given the reduction in volume. This allows the placenta to separate from the uterine interface, exposing maternal blood vessels that interface with the placental surface. After separation and delivery of the placenta, the uterus initiates a process of contraction and retraction, shortening its fiber and kinking the supplying blood vessels, like physiologic sutures or "living ligatures."

If the uterus fails to contract, or the placenta fails to separate or deliver, then significant hemorrhage may ensue. Uterine atony, or diminished myometrial contractility, accounts for 80% of postpartum hemorrhage. The other major causes include abnormal placental attachment or retained placental tissue, laceration of tissues or blood vessels in the pelvis and genital tract, and maternal coagulopathies. An additional, though uncommon, cause is inversion of the uterus during placental delivery.

The traditional pneumonic "4Ts: tone, tissue, trauma, and thrombosis" can be used to remember the potential causes. Here, a 5th is added; “T” for uterine inversion that will be called “traction.”

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Frequency

The incidence of postpartum hemorrhage is about 1 in 5 pregnancies, but this figure varies widely due to differential definitions for postpartum hemorrhage.

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Prognosis

The prognosis depends on the cause of the PPH, its duration, the amount of blood loss, comorbid conditions, and the effectiveness of treatment. Prompt diagnosis and treatment are essential to achieving the best outcome for any given patient. Most reproductive-age women will do well if managed promptly in a setting with operative and blood-product resources available.

Consequences include the sequelae of hemorrhage; aggressive fluid resuscitation; blood-product exposure; and procedures done to control uterine, cervical, vaginal, or peritoneal hemorrhage. 

Mortality

Although accountable for only 8% of maternal deaths in developed countries, postpartum hemorrhage is the second leading single cause of maternal mortality, ranking behind preeclampsia/eclampsia. [1]  Globally, postpartum hemorrhage is the leading cause of maternal mortality. The condition is responsible for 25% of delivery-associated deaths, [2]  and this figure is as high as 60% in some countries. International initiatives to improve outcomes have invested in training birth attendants (traditional or otherwise) and nurse midwives on the active management of the third stage of labor (the period immediately after delivering of the infant). Most efforts focus on uterine atony, which is the primary cause of postpartum hemorrhage. This has included education on manual techniques to increase uterine contraction-retraction and making pharmacologic uterotonic agents (oxytocin and misoprostol) more available. [3, 4, 5]

Morbidity

Postpartum hemorrhage is a potentially life-threatening complication of both vaginal and cesarean delivery. Associated morbidity is related to the direct consequences of blood loss as well as the potential complications of hemostatic and resuscitative interventions.

Consequences of uncontrolled hemorrhage

Hypovolemic shock and associated organ failure including renal failure, stroke, myocardial infarction may occur.

Postpartum hypopituitarism (Sheehan syndrome) may occur. Acute blood loss and/or hypovolemic shock during and after childbirth can lead to hypoperfusion of the pituitary and subsequent necrosis. Although often asymptomatic, it may present with an inability to breastfeed, fatigue, hypogonadism, amenorrhea, and hypotension.

Death secondary to hypovolemic shock may occur.

Consequences of fluid resuscitation

Fluid overload can lead to extremity edema and pulmonary edema. The latter is less common in young healthy women, but it should be suspected in the setting of large fluid and blood product resuscitation.

Dilutional coagulopathy occurs when crystalloids and/or serum-poor blood products are given in large volume.

Risks from exposure to blood products

The following may develop as a result of exposure of blood products:

  • Allergic or febrile reactions have an incidence of about 1 case per 333 population. [6]
  • Anaphylactic reactions occur in 1 in 20,000 to 1 in 47,000 blood products transfused. [7]
  • Transfusion-related acute lung injury (TRALI) occurs in 1 out of every 5,000 transfusions, but more often with high plasma containing products like fresh frozen plasma (FFP) and platelets. It often starts within 1-2 hours of the transfusion, but it can happen anytime up to 6 hours after a transfusion. The symptom complex includes severe bilateral pulmonary edema, severe hypoxemia, tachycardia, cyanosis, hypotension, and fever. [8]
  • Acute immune hemolytic reaction, though rare, is the most serious type of transfusion reaction. Symptoms are associated with red blood cell hemolysis. Patients may have fevers, chills, chest and lower back pain, nausea, renal failure, and death if the transfusion is not stopped.
  • Delayed hemolytic reaction: This type of reaction happens when the body slowly attacks antigens (other than ABO antigens) on the transfused blood cells. Symptoms occur days to weeks after a transfusion. Affected patients are either asymptomatic or have mild symptoms, which may include jaundice, low-grade fever, and a low hemoglobin or hematocrit. [9]
  • Infection: Hepatitis is the most common disease transmitted by blood transfusions. According to the American Red Cross, about 1 blood transfusion in 205,000 transmits a hepatitis B infection, and 1 blood transfusion in about 2 million transmits hepatitis C. Other rare but potential infections include HIV (risk of 1 in 2.5 million), Lyme disease, babesiosis, and malaria. Donors are screened for potential exposure so transmission is very rare. Rarely, blood may be contaminated with tiny amounts of skin bacteria during donation. Platelets are the most likely blood product to be affected by contamination from skin flora.
  • Metabolic reactions: With large volume and rapid transfusions, patients are at risk of encountering 3 metabolic reactions:  hypothermiahyperkalemia, and citrate toxicity. Hypothermia results from the transfusion of unwarmed crystalloid or colloid that drops the body temperature. Hypothermia inhibits coagulation and can worsen postpartum hemorrhage. Citrate is a blood product additive that binds serum calcium and can cause hypocalcemia with large-volume transfusions. Hemolysis occurs with red blood cell storage releasing increasing amounts of intracellular potassium with time. Transfusions of older red blood cells increase the risk of hyperkalemia.

Risks associated with surgical intervention

The following may result following surgical intervention:

  • Intubation and anesthesia complications: Pregnant women have an increased risk for aspiration, failed intubation, and death from failed ventilation when compared with nonpregnant patients. Respiratory injury or infection, myocardial infarction, myocardial arrhythmia, stroke, or allergic reactions to anesthetic medications may also rarely occur.
  • Bleeding: Continued bleeding from the genital tract or a bleeding complication from the surgery may occur.
  • Infection: Sepsis, wound infection, or pneumonia is possible.
  • Deep venous thrombosis and/or  pulmonary embolism: Risk is increased due to postpartum and postoperative associated hypercoagulability as well as from relative immobility in the operative and postoperative period.

Need for permanent sterilization to control bleeding

If the bleeding cannot be controlled conservatively (removal of products of conception, suturing disrupted tissues, application of pressure) then surgical intervention may be necessary. In severe cases, the following may occur:

  • Hysterectomy
  • Asherman syndrome, which is secondary (non-hormone mediated) amenorrhea due to uterine scarring that develops after infection and/or curettage performed to remove placental fragments
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Patient Education

Postpartum hemorrhage can be a frightening experience for patients. It is important to provide reassurance and communicate through each step of emergency care. Make patients aware of what to anticipate through their clinical course including expected procedures; transport; and the indication, risks, and benefits of interventions.

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