Arterial compliance / stiffness

What it is

Arterial compliance describes how much arterial volume changes for a given pressure change; lower compliance means a stiffer arterial wall.^[1]

Why it matters

Stiffer arteries absorb less of each heartbeat's volume pulse, so pressure waves and pulse pressure can rise more easily.^[2,1]

Root causes of abnormal values

• Core relation: A softer arterial wall expands and stores part of the heartbeat's energy; a harder wall expands less, so the same stroke volume becomes a larger pressure rise.^[1,2]

What it affects

• It is a mechanism node for pulse pressure, systolic pressure, aging-related vessel context, and vascular load.^[2]

Interpretation traps

• Routine blood pressure does not directly measure arterial stiffness.^[2]

Related conditions