Shock: A Physiology-First Approach | Visual Rounds

This is a Visual Rounds episode — a more foundational crossover from the YouTube side of Trauma ICU Rounds.

Shock is not simply hypotension.

In this episode, we work through a physiology-first approach to shock: oxygen delivery, cardiac output, arterial oxygen content, MAP versus perfusion, compensated shock, mixed shock, and the four major shock states — hypovolemic, cardiogenic, obstructive, and distributive.

The goal is to move beyond simply naming a shock category and instead understand what part of the circulation is failing, what physiology is dominant, and how that should shape the first moves in resuscitation.

Topics include:

• Recognizing shock before profound hypotension develops
• Oxygen delivery: DO₂ = cardiac output × arterial oxygen content
• Cardiac output, preload, contractility, and afterload
• The importance of hemoglobin and oxygen-carrying capacity
• MAP versus tissue perfusion
• Compensated and mixed shock
• Hypovolemic, cardiogenic, obstructive, and distributive shock
• Initial resuscitation and mechanism-specific treatment

This episode is intentionally foundational and provides the framework for deeper Trauma ICU Rounds episodes on individual shock states and resuscitation.

If you find this kind of physiology-first critical care teaching useful, subscribe to Trauma ICU Rounds on YouTube for the full Visual Rounds series.

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Trauma ICU Rounds is intended for healthcare education. It does not replace clinical judgment, individualized patient care or local protocols.