人体的血管除经动脉—毛细血管—静脉相通外，在动脉与动脉之间，静脉与静脉之间，甚至动脉与静脉之间，可借吻合管形成血管吻合。
同时促进侧枝循环的建立，使缺血区获得新的血供。
It can also improve the compensatory circulation to rescue the ischemic regions.
慢性门脉高压可导致侧枝循环建立，可出现脐部和上腹部局部水母头样改变。
Chronic portal hypertension may lead to development of collateral circulation, which is manifested as caput medusa in the region of the umbilicus and epigastrium.
其机理与头皮针扩张缺血区脑血管，改善脑供血及促进侧枝循环尽早建立有关。
The mechanism is related to scalp acupuncture dilating blood vessels in the ischemic area, improving the blood supply to the brain and promoting the early formation of collateral circulation.
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