Shock: A Physiology-First Approach | Visual Rounds

Shock represents a failure of the circulatory system to deliver sufficient oxygen to tissues, rather than merely a drop in blood pressure. Effective management requires understanding the oxygen delivery equation, where delivery equals cardiac output multiplied by arterial oxygen content. Clinicians must distinguish between four primary physiologic failure points—hypovolemia, cardiogenic dysfunction, obstructive mechanical blocks, and distributive vascular tone abnormalities—to guide targeted interventions. Using a trauma case study, the discussion emphasizes that resuscitation should begin immediately upon recognizing hypoperfusion, even while the specific etiology remains under investigation. Because patients often present with mixed shock states, providers must continuously reassess the dominant physiology and adjust treatments accordingly. Prioritizing tissue perfusion over isolated vital sign monitoring prevents misdiagnosis and ensures the correct application of life-saving interventions.