Ewart氏征用于表示扩大的心脏后面,由压迫性肺不张而产生的一群捻发样水泡音。但是,有趣的是,在心肌梗塞发作之后不久或伴有急性冠状动脉供血不全时即使无心脏扩大,在心脏后面的肺部常常显示捻发样水泡音,这些水泡音在几小时至2或3天后慢性消除并消失。这些水泡音的确切机制尚不十分明确。这种水池音若不仔细检查往往不能发现。单纯 Ewart’s signature is used to indicate a group of twisting bursts of sound produced by pressure atelectomy behind the enlarged heart. Interestingly, however, the absence of cardiac enlargement shortly after onset of myocardial infarction, or with acute coronary insufficiency, often shows shriveled-like blisters in the lungs behind the heart and these blisters sound for hours to 2 or 3 After days of chronic elimination and disappearance. The exact mechanism of these blisters is not yet clear. This pool tone can not often be found without careful examination. simple