Exsanguination

Severe loss of blood

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Figure A shows a normal aorta. Figures B and C show aneurysms in parts of the aorta. When an aneurysm breaks (like a popped balloon), a person can exsanguinate in just minutes.

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Blood transfusions are an important treatment for exsanguination

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First aid saved many people from exsanguinating after the Boston Marathon bombings. This photo shows people giving first aid to stop bleeding

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Injuries that hurt major arteries, like the femoral artery (in red), can cause exsanguination

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Exsanguination after childbirth is most common in countries colored black and red on this map. It is least common in countries colored blue and purple.

Exsanguination is the process of blood loss, to a degree sufficient to cause death. It is most commonly associated with severe trauma or injury, but can also occur due to medical conditions or surgical complications. The term is derived from the Latin "exsanguinatus," meaning "drained of blood."

Causes

Exsanguination can occur due to a variety of causes, including:

• Traumatic injury: Severe injuries, such as those sustained in motor vehicle accidents, gunshot wounds, or stabbing, can lead to rapid blood loss.
• Surgical complications: During surgery, accidental damage to major blood vessels can result in significant hemorrhage.
• Medical conditions: Certain conditions, such as hemophilia or ruptured aneurysms, can predispose individuals to severe bleeding episodes.
• Obstetric emergencies: Conditions such as placental abruption or uterine rupture can lead to massive hemorrhage in pregnant women.

Pathophysiology

The human body contains approximately 5 to 6 liters of blood. Loss of more than 40% of total blood volume can lead to hypovolemic shock, a life-threatening condition characterized by inadequate blood flow to organs and tissues. The body attempts to compensate for blood loss through mechanisms such as increased heart rate and vasoconstriction, but these are often insufficient in cases of massive hemorrhage.

Clinical Presentation

Patients experiencing exsanguination may present with:

• Pallor: Due to reduced blood flow to the skin.
• Tachycardia: As the heart attempts to maintain cardiac output.
• Hypotension: Resulting from decreased blood volume.
• Altered mental status: Due to reduced cerebral perfusion.
• Cold, clammy skin: As a result of peripheral vasoconstriction.

Management

Immediate management of exsanguination involves:

• Hemorrhage control: Applying direct pressure, using tourniquets, or surgical intervention to stop bleeding.
• Fluid resuscitation: Administering intravenous fluids and blood transfusions to restore blood volume.
• Surgical intervention: In cases where bleeding cannot be controlled externally, surgical exploration may be necessary.

Prognosis

The prognosis of exsanguination depends on the rapidity of intervention and the underlying cause. Prompt medical attention can significantly improve outcomes, but delays in treatment often result in high mortality rates.

Prevention

Preventive measures include:

• Safety measures: Using seat belts, helmets, and other protective gear to reduce the risk of traumatic injuries.
• Medical management: Proper management of conditions that predispose to bleeding, such as anticoagulation therapy.

Related pages

• Hemorrhage
• Hypovolemic shock
• Blood transfusion
• Trauma surgery