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目的：探讨辅助控制呼吸（Ａ／Ｃ）、同步间歇指令呼吸（ＳＩＭＶ）和压力支持（ＰＳＶ）三种通气模式对血液动力学的影响。方法：对１２例危重症患者在呼吸支持最初阶段采用Ａ／Ｃ方式，并逐次改为ＳＩＭＶ和ＰＳＶ方式，每种模式持续３０ｍｉｎ，三种模式吸入氧浓度不变，利用Ｓｗａｎ－Ｇａｎｚ导管获得血流动力学参数。结果：与Ａ／Ｃ相比，ＳＩＭＶ和ＰＳＶ可降低外周循环阻力（ＳＶＲ），增加心脏指数（ＣＩ），进一步增加动脉血氧分压（Ｐａｏ２）和低的吸气峰值压（ＰＩＰ）。结论：与Ａ／Ｃ相比，ＳＩＭＶ和ＰＳＶ对血液动力学影响较小，可进一步增加组织的氧利用率
Objective: To investigate the hemodynamic effects of three modes of ventilatory support (A / C), synchronized intermittent mandatory breath (SIMV) and pressure support (PSV). Methods: Twelve critically ill patients were treated with Awannei-Ganz catheter in the initial phase of A / C and gradually changed to SIMV and PSV. Each mode lasted for 30 minutes. Flow dynamics parameters. RESULTS: Compared with A / C, SIMV and PSV decreased peripheral circulation resistance (SVR), increased cardiac index (CI) and further increased Pao2 and PIP. Conclusion: Compared with A / C, SIMV and PSV have little effect on hemodynamics, which can further increase the tissue oxygen utilization rate