Hemorrhage Control and Tourniquet Application

Hemorrhage control is the set of prehospital actions used to stop or limit external bleeding from traumatic injury — direct pressure, wound packing, hemostatic dressings, and the tourniquet for severe limb hemorrhage. Because uncontrolled bleeding is a leading cause of preventable death after injury, rapid hemorrhage control is a central part of trauma resuscitation.

Definition

Hemorrhage control comprises the maneuvers used to stop external bleeding after injury, including direct pressure, wound packing and hemostatic dressings, and the application of a tourniquet to arrest severe limb hemorrhage that cannot be controlled by pressure alone.

Scope

This entry covers the rationale and main techniques of external hemorrhage control, the role of the limb tourniquet, and the adjunctive use of antifibrinolytic therapy in major trauma hemorrhage. It is descriptive and does not provide application technique, device instructions, or dosing.

Key concepts

• Preventable death from hemorrhage
• Direct pressure and wound packing
• Hemostatic dressings
• Limb tourniquet
• Junctional hemorrhage
• Antifibrinolytic therapy (tranexamic acid)
• Bystander 'Stop the Bleed' response

Mechanisms

Severe external bleeding depletes circulating blood volume, reducing oxygen delivery and driving the trauma triad of coagulopathy, acidosis, and hypothermia. Hemorrhage control works by mechanically arresting blood loss: direct pressure and wound packing occlude bleeding vessels, hemostatic dressings accelerate clot formation, and a tourniquet applied proximal to a severe limb wound stops arterial inflow when pressure alone is insufficient. Military and civilian experience showed that prompt tourniquet use in major limb trauma can be lifesaving. Separately, the antifibrinolytic drug tranexamic acid acts pharmacologically by inhibiting clot breakdown and, in a large randomized trial, reduced death in bleeding trauma patients, complementing physical hemorrhage control.

Clinical relevance

Hemorrhage control is a defining skill of prehospital trauma care and of public bleeding-control initiatives, because deaths from exsanguination can occur before definitive surgical care. This entry summarizes principles and evidence for reference; the indications for and application of tourniquets, dressings, and antifibrinolytics follow current trauma guidelines and training rather than this summary.

Epidemiology

Hemorrhage is among the leading causes of preventable death after trauma, particularly on the battlefield and in civilian mass-casualty events. Observational data on emergency tourniquet use in major limb trauma documented survival benefit and helped drive wider civilian adoption, and the CRASH-2 trial established that early tranexamic acid reduces mortality in patients with significant traumatic hemorrhage.

History

Tourniquets fell out of favor in twentieth-century civilian practice over concerns about limb injury, but military experience in the early twenty-first century, supported by observational outcome data, re-established the modern limb tourniquet as a lifesaving device. This evidence, together with the CRASH-2 trial of tranexamic acid, shaped contemporary trauma hemorrhage-control practice and public bleeding-control programs.

Debates

Risk-benefit and duration of tourniquet use

Although tourniquets are now accepted for severe limb hemorrhage, the balance between rapid bleeding control and the risk of ischemic limb injury with prolonged application — and how this translates to varied civilian transport times — continues to be examined.

Seminal works

• kragh-2008
• crash2-2010

Frequently asked questions

Why has the tourniquet returned to favor for severe bleeding?

Military and civilian experience, supported by observational outcome data, showed that prompt tourniquet use for major limb hemorrhage can prevent death from blood loss, reversing earlier reluctance based on concerns about limb injury.

How does tranexamic acid relate to physical bleeding control?

Tranexamic acid is a drug that slows the breakdown of blood clots; in a large randomized trial it reduced death in trauma patients with significant bleeding, acting as a pharmacologic complement to physical measures like pressure and tourniquets.