Collateral
Origin
Middle English, from Anglo-French, from Medieval Latin collateralis, from Latin com- + lateralis lateral
Definitions
- 1a : accompanying as secondary or subordinate : concomitant <digress into collateral matters>
- b : indirect
- c : serving to support or reinforce : ancillary
- 2: belonging to the same ancestral stock but not in a direct line of descent — compare lineal
- 3: parallel, coordinate, or corresponding in position, order, time, or significance <collateral states like Athens and Sparta>
- 4a : of, relating to, or being collateral used as security (as for payment of a debt or performance of a contract)
- b : secured by collateral
Description
In medicine, collateralization, also vessel collateralization and blood vessel collateralization, is the growth of a blood vessel or several blood vessels that serve the same end organ or vascular bed as another blood vessel that cannot adequately supply that end organ or vascular bed sufficiently.
Coronary collateralization is considered a normal response to hypoxia and may be induced, under some circumstances, by exercise. It is considered to be protective.
Collateral or anastomotic blood vessels also exist even when blood supply is adequate to an area, and these blood vessels are often taken advantage of in surgery. Some notable areas where this occurs include the abdomen, rectum, knee, shoulder, and head.[1]
