Arterial elastance
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The ratio of left ventricular end-systolic pressure and stroke volume
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Intravascular volume
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The blood volume within the vascular system (arteries, capillaries, veins)
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Mean systemic filling pressure
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The pressure of venous return when cardiac activity is absent
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Preload
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Volume defined by the distending pressure it generates. In the heart, preload is LV wall stress at end of diastole (= EDV)
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Stressed volume
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The (theoretically measurable) volume of blood that exerts distending pressure against the vascular wall
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Total body water
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The amount of sodium-free water in the whole body, commonly divided into the extracellular fluid space and the intracellular fluid space
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Unstressed volume
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The volume of blood just to the point of filling the blood vessels but without exerting any pressure on the vessel walls
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Vascular capacitance
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The change in volume divided by the change in pressure (i.e., the inverse of elastance)
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