There is no specific time for the establishment of collateral circulation, which is mainly based on the part of the site where it is established.
1. Cardiac collateral circulation: Cardiac collateral circulation generally refers to the severe narrowing of arteries or large blood vessels, and small capillaries are generated from the side for the innervation of large blood vessels to normalize the vascular supply. The establishment of cardiac collateral circulation usually takes about several months. By dilating blood vessels, it changes or reduces myocardial ischemia and infarction, and reduces the mortality rate of patients.
2. Lower limb collateral circulation: the establishment of lower limb collateral circulation is to open a blood vessel beside the occluded artery for the use of large blood vessels. The establishment of lower limb collateral circulation is a chronic process, which usually takes about several months, and it improves the symptoms through the collateral circulation to make the arterial blockage not to suffer from the insufficiency of blood supply.
The time for the establishment of collateral circulation depends mainly on the location and there is no exact value.