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动态观察１４例经皮冠状动脉腔内成形术（ＰＴＣＡ）病人手术前后心脏收缩时间间期（ＳＴＩ）变化，估价ＳＴＩ改变时判断晕厥心肌的价值。结果显示：ＰＴＣＡ后３～５ｄ，ＳＴＩ评价左心功能较为敏感的指标射血前时间／左室射血时间（ＰＥＰ／ＬＶＥＴ）比值，由０．３８６±０．６００增加至０．４６０±０．０７０；至７～８ｄ恢复至术前水平。与同期测定的超声心动图左室射血分数（ＬＶＥＦ）相比，变化趋势一致。提示ＰＴＣＡ后，系列测定ＳＴＩ，可动态反映左心功能变化。ＰＥＰ／ＬＶＥＴ比值改变可作为判断晕厥心肌恢复的指标之一。
The changes of systolic time (STI) before and after operation in 14 patients with PTCA were observed dynamically to evaluate the value of STI in determining myocardial infarction. The results showed that the ratio of pre-ejection time / left ventricular ejection time (PEP / LVET) increased from 0.386 ± 0.600 to 0.460 ± 0 .070; to 7 ~ 8d returned to the preoperative level. Compared with the same time measured echocardiography left ventricular ejection fraction (LVEF), the trend of change. After the prompt PTCA, the series measured STI, can dynamically reflect left ventricular function changes. PEP / LVET ratio changes can be used as a judge of syncope myocardial recovery one of the indicators.