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近来有两种血液动力学理论进一步解释了为什么尽管存在广泛的侧技循环以减低门脉系统的压力,而门脉压仍继续升高。“倒流”学说认为门脉高压纯粹是对不变的门脉血流,甚或是减少的门脉血流阻力增加的缘故。相反,“前流”学说指出减少内脏前毛细血管阻力,增加门脉血流,即使有广泛的门脉系统分流以矫正增高的门静脉阻力,但门脉高压仍然可以存在。新近的研究证明增加的门静脉血流是维持和加重门脉压力的一
Two recent theories of hemodynamics further explain why portal pressure continues to increase despite the extensive lateral circulation to reduce the pressure on the portal system. “Backflow” doctrine that portal hypertension is purely constant portal blood flow, or even reduced portal blood flow resistance of the reason. In contrast, the “frontal flow” doctrine states that reducing portal visceral capillary resistance and increasing portal blood flow can still exist even with extensive portal system shunting to correct for increased portal vein resistance. Recent studies have shown that increased portal vein blood pressure is one of maintaining and aggravating portal pressure