Effective hemodynamic performance in critical illness depends not only on cardiac function or vascular tone in isolation, but on how well these two systems work together—a relationship known as arterioventricular coupling.

Arterioventricular coupling describes the dynamic interaction between ventricular contractility and arterial load. At its core, it reflects how efficiently the heart converts myocardial energy into forward blood flow against the impedance of the arterial system. When coupling is optimized, oxygen delivery is achieved with minimal energetic cost. When disrupted—as commonly occurs in shock—patients may exhibit impaired perfusion despite apparently “normal” blood pressure readings.

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The sections that follow break this concept into its two foundational components:

• Cardiac Function —  the heart’s ability to generate flow.

• Arterial Vascular Function — how arterial compliance and resistance shape afterload and influence cardiac efficiency.

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