Published online by Cambridge University Press: 23 August 2019
Hemorrhage is a leading cause of death in trauma, following head injury. Shock is defined by inadequate tissue perfusion with hemodynamic instability and organ dysfunction.1–10 In trauma, the most common cause of shock is due to acute hemorrhage. Advanced Trauma Life Support (ATLS) describes four classes of hemorrhage,1 but these are not relevant to real world practice, due to different injury types (blunt vs. penetrating), age (due to blunted physiologic responses in the elderly), comorbidities, and medication use (beta blockade reduces the chance of tachycardia in response to decreased blood pressure).6–14 Bradycardia may also be seen in hemorrhage, due to several causes including vagal stimulation and failure to mount a tachycardic response.13,14
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