# Distensibility

Distensibility is a metric of the stiffness of blood vessels. It is defined as

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

where ${\displaystyle d_{sys}}$ and ${\displaystyle d_{dias}}$ are the diameter of the vessel in systole and diastole, and ${\displaystyle p_{sys}}$and ${\displaystyle p_{dias}}$are the systolic and diastolic blood pressure.[1]

## References

1. Roccabianca, S.; Figueroa, C. A.; Tellides, G.; Humphrey, J. D. (2014-01-01). "Quantification of regional differences in aortic stiffness in the aging human". Journal of the Mechanical Behavior of Biomedical Materials. 29: 618–634. doi:10.1016/j.jmbbm.2013.01.026. ISSN 1751-6161. PMC 3842391. PMID 23499251.