Hemorrhage Control

Hemorrhage control is the set of techniques and principles used to identify and stop bleeding after injury, ranging from direct pressure and tourniquets for external limb bleeding to operative and endovascular control of internal sources. Because uncontrolled haemorrhage is a leading cause of early preventable death in trauma, rapid bleeding control is a central priority of injured-patient care.

Definition

Hemorrhage control is the timely identification and arrest of bleeding through mechanical, pharmacological, surgical, or endovascular means, undertaken to limit blood loss, preserve perfusion, and prevent or reverse haemorrhagic shock.

Scope

This entry covers the conceptual basis of haemorrhage control: recognising compressible versus non-compressible bleeding, the role of mechanical measures such as direct pressure and tourniquets, the place of antifibrinolytic therapy, and the pathophysiology of haemorrhagic shock. It is a reference and educational overview rather than a clinical or procedural protocol.

Core questions

• How are compressible and non-compressible sources of haemorrhage distinguished, and why does it matter?
• What is the evidence base for tourniquet use in major limb haemorrhage?
• How does antifibrinolytic therapy contribute to bleeding control?
• What is haemorrhagic shock and how does ongoing bleeding drive it?

Key concepts

• Compressible vs non-compressible haemorrhage
• Direct pressure and wound packing
• Tourniquet application
• Haemorrhagic shock
• Permissive hypotension
• Antifibrinolytic therapy (tranexamic acid)
• Damage control surgery

Mechanisms

Bleeding reduces circulating volume and, if uncontrolled, leads to haemorrhagic shock with inadequate tissue perfusion, acidosis, and trauma-induced coagulopathy that further impairs clotting (Cannon, 2018). Control strategy depends on the source: compressible external bleeding, especially from limbs, can be arrested mechanically with direct pressure, wound packing, or a tourniquet, whereas non-compressible truncal haemorrhage requires surgical or endovascular intervention. Tourniquet use for major limb bleeding has been associated with improved survival (Kragh, 2009). Pharmacologically, the antifibrinolytic tranexamic acid reduces bleeding-related death when given early (Shakur, 2010). Contemporary guidelines integrate mechanical, pharmacological, and resuscitative measures into a coherent bleeding-management strategy (Rossaint, 2023).

Clinical relevance

Understanding hemorrhage control supports the interpretation of trauma evidence and the rationale for prioritising bleeding in injured patients. This entry describes concepts and evidence for reference; it does not provide procedural instruction, dosing, or individualised treatment guidance, which require appropriate training and local protocols.

Epidemiology

Haemorrhage is among the most common causes of early, potentially preventable death after major injury, and extremity bleeding in particular is a recognised cause of survivable deaths in both military and civilian settings, motivating public initiatives that teach basic bleeding-control measures.

History

Tourniquets have a long and at times controversial history in surgery and warfare; concern about limb ischaemia led to periods of restricted use. Military experience in the 2000s, supported by outcome data such as Kragh and colleagues' 2009 study, rehabilitated the tourniquet as a life-saving device for major limb haemorrhage. In parallel, the CRASH-2 trial (Shakur, 2010) established a role for early antifibrinolytic therapy, and these advances were incorporated into damage control resuscitation and successive trauma guidelines.

Seminal works

• kragh-2009
• shakur-2010-crash2
• cannon-2018

Frequently asked questions

Why is a tourniquet used for some bleeding but not others?

Tourniquets control compressible external bleeding from a limb by occluding arterial inflow; they cannot control non-compressible bleeding inside the chest, abdomen, or pelvis, which requires surgical or endovascular measures.

What is haemorrhagic shock?

Haemorrhagic shock is a state of inadequate tissue perfusion caused by significant blood loss; if bleeding continues it can produce a self-reinforcing cycle of hypoperfusion, acidosis, and coagulopathy.