Distensibility

Distensibility is a metric of the stiffness of blood vessels.

It is defined as

{\displaystyle D={\frac {d_{sys}-d_{dias}}{(p_{sys}-p_{dias})d_{dias}}}}

{\displaystyle d_{sys}}

are the diameter of the vessel in systole and diastole, and

{\displaystyle p_{sys}}

are the systolic and diastolic blood pressure.