Systolic Murmurs

Systolic murmurs can be found in 126 patients .

126例患者可闻及明确收缩期杂音。

Systolic murmurs are classified according to their time of occurrence , sound quality , and duration .

根据其出现时间、音性质及持续时间对收缩期杂音进行分类。

Early and late systolic murmurs also occur and should be distinguished from ejection murmurs .

在收缩早期或晚期也会出现杂音，应与喷射音相区别。

The proportion of PDA in premature infants with systolic murmurs or cyanosises is high .

早产伴收缩期杂音、青紫PDA检出的比例较高；