![]() η(δ) = viscosity of blood in the wall plasma release-cell layering.The conversion between these units is: ġ mmHG ⋅ min L ( HRUs ) = 8 MPa ⋅ s m 3 = 80 dyn ⋅ sec cm 5 This is numerically equivalent to hybrid resistance units (HRU), also known as Wood units (in honor of Paul Wood, an early pioneer in the field), frequently used by pediatric cardiologists. s/m 3) or, for ease of deriving it by pressure (measured in mmHg) and cardiac output (measured in L/min), it can be given in mmHg.cm −5, pascal seconds per cubic metre (Pa.Units for measuring vascular resistance are dyn Vasoconstriction (i.e., decrease in blood vessel diameter) increases SVR, whereas vasodilation (increase in diameter) decreases SVR. Systemic vascular resistance is used in calculations of blood pressure, blood flow, and cardiac function. The resistance offered by the systemic circulation is known as the systemic vascular resistance ( SVR) or may sometimes be called by the older term total peripheral resistance ( TPR), while the resistance offered by the pulmonary circulation is known as the pulmonary vascular resistance ( PVR). ![]() Vascular resistance is the resistance that must be overcome to push blood through the circulatory system and create blood flow. Force from blood vessels that affects blood flow
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