Besides acute dyspnea and X-ray appearance PaO_2/FiO_2,a/APO_2 and P(A-a)O_2 should also be tested for early diagnosis of neurogenic pulmonary edema.

• 对颅脑损伤后NPE的早期诊断除依据急性呼吸困难和X线胸片外,还应着重根据PaO_2/FiO_2、a/APO_2、P(A-a)O_2等指标的变化情况判断是否发生神经源性肺水肿,并可将其作为判断病情的参考指标。