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【目的】本研究探讨术前口服倍他乐克对麻醉诱导时丙泊酚的用量和血流动力学变化的影响。【方法】选择择期手术的全麻病人（ASAⅠ～Ⅱ）60例，随机分成两组，每组30例，第一组为实验组（B组），术前口服倍他乐克50mg，第二组为对照组（C组）给予安慰剂；以30mg·kg^-1·h^-1的恒速灌注丙泊酚至BIS达到50，记录病人入睡时和BIS=50时丙泊酚的用量以及插管前后血压、心率、中心静脉压和心输出量变化。【结果】两组病人入睡时丙泊酚的用量：B组是（1_35±0．22）mg·kg^-1；C组是（1．60±0．24）mg·kg^-1，组间差异P〈0．01；BIS=50时的丙泊酚的用量：B组是（1．71±0．27）mg·kg^-1；C组是（1．98±0．24）mg·kg^-1；组间差异P〈0．01；B组插管前、后血压和心率的变化程度较C组小（P〈0．05），插管过程中心静脉压和心输出量组间变化差异不大。【结论】术前口服倍他乐克50mg减少麻醉诱导丙泊酚的用量，插管时的血流动力学相对稳定。

Portal vein thrombosis （PVT） is one of the common complications during the natural course of liver cirrhosis and has an important influence on the progression of liver cirrhosis. This article mainly summarizes the research advances in the risk factors for PVT. There are many risk factors for PVT， and Virchow’s triad， namely venous stasis， hypercoagulability， and vascular endothelial injury and systemic inflammation caused by surgery or trauma， are considered the main reasons for the development and progression of PVT. At present， more prospective studies are still needed to validate the predictive models for the risk of PVT that have certain application prospects in clinical practice. Cirrhotic patients with PVT tend to have a poor prognosis， and complete obstructive PVT is associated with increased mortality after liver transplantation. Recent studies have shown that prophylactic anticoagulant therapy is safe and effective in patients with liver cirrhosis and can thus help with the prevention and treatment of PVT. [ABSTRACT FROM AUTHOR]

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