生物常量

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Medical Wiki

Systemic vascular resistance

The outlet resistance blood meets as it flows through systemic vessels.

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What it is

Systemic vascular resistance is the resistance blood meets across the systemic circulation, strongly shaped by small arteries and arterioles.[1]

Why it matters

When resistance is higher, the same flow needs more pressure to pass through the vascular system.[2,1]

Root causes of abnormal values

  • Core relation: Narrower systemic vessels create more outlet resistance; more resistance means blood flow needs a higher pressure gradient to move through tissues.[1,2]

What it affects

  • It is a bridge between vessel tone, blood pressure, afterload, and perfusion context.[1]

Interpretation traps

  • BioConst does not estimate personal SVR from routine blood pressure readings.[1]

Related conditions

High blood pressure and heart loadHeart failure and pump reserve