Which triad constitutes the triad of death in trauma patients?

• A. Hypovolemia, Orthostatic hypotension, Coagulopathy
• B. Acidosis, Hypothermia, Hypokalemia
• C. Coagulopathy, Hypothermia, Hyperkalemia
• D. Acidosis, Hypothermia, Coagulopathy

Answer: (D)

The triad of death in trauma is acidosis, hypothermia, and coagulopathy. When a patient has massive hemorrhage, poor tissue perfusion drives anaerobic metabolism, producing lactic acidosis. That acidosis impairs the coagulation cascade and platelet function, worsening bleeding. At the same time, exposure and resuscitation with cold fluids can lower core temperature, and hypothermia further depresses enzymatic activity in coagulation and platelet function. The bleeding itself then causes ongoing blood loss and more acidosis and hypothermia. This interrelated cycle—acidosis impairing coagulation, hypothermia slowing clotting, and coagulopathy leading to more bleeding—drives a high risk of death, hence it’s described as the lethal triad.

Other options describe signs of volume loss or electrolyte disturbances, but they don’t form this interdependent trio that critically worsens outcome in trauma. Clinically, preventing and interrupting this triad means warming the patient and IV fluids, minimizing unnecessary crystalloids, and rapidly correcting coagulopathy with balanced blood product resuscitation and antifibrinolytics as appropriate, all while controlling hemorrhage.