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肺水肿是肺内含有过量的液体。液体的分布决定了肺水肿的临床意义。肺水测定取决于水存在的绝对量。目前临床上应用的肺水测定方法主要有胸部X 线、可溶性气体法、双指示剂稀释法、CT 扫描和体外放射性测定等。但这些方法还不能准确地测出水的分布。理想的肺水测定法应为准确、灵敏、易于重复、无创伤性、实用而且价廉。
Pulmonary edema is the lung contains excessive fluid. The distribution of fluid determines the clinical significance of pulmonary edema. Lung water determination depends on the absolute amount of water present. At present, the clinical application of lung water determination methods are mainly chest X-ray, soluble gas method, dual indicator dilution method, CT scan and in vitro radioactivity determination. However, these methods can not accurately measure the water distribution. Ideal lung water determination should be accurate, sensitive, easy to repeat, non-invasive, practical and inexpensive.