Siefkin A D
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Compare the chest film with previous films, if possible. Changes in heart size and interstitial and vascular markings can thus be seen more readily, as can air trapping; this also aids in differentiation of acute from chronic changes. A Holter monitor study should be obtained if dyspnea occurs irregularly, has acute onset and termination, or is associated with dizziness or syncope; or if the resting ECG shows frequent premature atrial contractions, premature ventricular contractions, bradycardia, or periods of advanced heart block.
如果可能的话，将胸部X光片与之前的片子进行对比。这样就能更清楚地看到心脏大小、间质和血管纹理的变化，以及气体潴留情况；这也有助于区分急性和慢性变化。如果呼吸困难发作不规律、起病急且终止迅速、或伴有头晕或晕厥；或者静息心电图显示频繁房性早搏、室性早搏、心动过缓或高度房室传导阻滞，则应进行动态心电图监测。
