systemic vascular resistance

Systemic vascular resistance (SVR) is the measure of how much the small blood vessels in your body resist the flow of blood. Think of it like the resistance you feel when trying to push air through a narrow straw—narrower or more constricted vessels increase resistance, making it harder for blood to circulate. SVR helps regulate blood pressure; higher resistance raises blood pressure, while lower resistance lowers it. The body adjusts SVR through mechanisms like vessel dilation or constriction to maintain stable blood pressure and ensure tissues receive enough oxygen and nutrients.