(1)扩张静脉血管，降低前负荷(Reduce preload)：较小剂量即可舒张较大的静脉，增加静脉容量，从而减少回心血量，心室舒张末期容积缩小，心室壁肌张力降低，射血间期缩短，降低...
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Reduce heart preload 心脏减负荷
PPV is very helpful in patients with cardiogenic pulmonary edema, as it helps to reduce preload and afterload.
PPV对心源性肺水肿的患者十分有益，因它可减少前负荷和后负荷。
Calcium channel blockers reduce afterload with little effect on preload.
钙通道阻滞剂降低后负荷，而对前负荷几乎没有作用。
We hypothesized that a protein preload would reduce the postprandial glycemic excursion in type 2 diabetic patients by these mechanisms.
根据以上机制，我们认为餐前服用些许蛋白质可以降低2型糖尿病患者的餐后高血糖。
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