How many years can collateral circulation grow?

summary

Collateral circulation is the vascular network formed between the proximal and distal branches of the vascular trunk. These vascular networks are inherent, usually at rest and do not work. But when the main stem is blocked, it becomes active and undertakes part of the blood circulation task to supplement the insufficiency of the main stem blood circulation, or even completely replace it. This ensures that the blood supply to the tissue is not cut off. How many years can collateral circulation grow? Let's talk about it

How many years can collateral circulation grow?

There must be enough anastomotic branches between the original vessels. In normal cases, some arteries (such as the small branches of mesenteric artery) are reticular branches with many anastomotic branches, which are easy to establish collateral circulation; Some arteries (such as the branches of the small arteries of the spleen and kidney) are dendritic branches with few anastomotic branches, so it is not easy to establish collateral circulation. There are many anastomotic branches in the venous system, and it is easy to establish collateral circulation once it is blocked. In general, it is not easy to establish collateral circulation

The speed of vascular obstruction is slow. If the rate of vascular obstruction occurs quickly (such as portal vein thrombosis), collateral circulation can not be established in time. If the vascular obstruction is gradual (such as portal vein blood flow obstruction caused by cirrhosis), collateral circulation is easy to establish.

The establishment of collateral circulation is gradual, and a series of adaptive changes will occur during the opening of anastomotic vessels. At first, due to hypoxia in the local tissue of vascular occlusion, under the stimulation of acidosis, the anastomotic vessels first showed relaxation of the tension of vascular wall smooth muscle, and then the vessels dilated and lengthened and became curved, making the original vessels which were not easy to be seen clearly. For example, the rabbit femoral artery was blocked by thrombus, and the anastomotic artery dilated within a few days; For another example, after experimental coronary artery occlusion in dogs, the diameter of anastomotic artery can be expanded up to 30 times of the original diameter. With the expansion of blood vessels and the increase of blood flow, the wall of blood vessels also thickens correspondingly.

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