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当心脏搏动时,心尖部所对向的胸壁可出现相应的震动。应用压电型微音扩大器将这些震动转换为电能,经放大后所录得的曲线,称为心尖搏动图(ACG)。它是属于一种低频率(<25周/秒)的移位波,能反映出每一心动周期各时相中心尖搏动的动态情况。由于本检查法属非侵入性,故目前临床上已广泛地应用于各种心脏病,特别是冠心病的检查,能较正确地反映出左心室的血流动力学改变。
When the heart beat, the apex of the chest wall can be the corresponding vibration. Piezoelectric microphones are used to convert these vibrations into electrical energy. The magnified curve is called the apex beat chart (ACG). It belongs to a low-frequency (<25 weeks / second) shift wave that reflects the dynamics of the apical beating at each phase of each cardiac cycle. Due to the non-invasive nature of the test, it has been widely used clinically in a variety of heart diseases, especially coronary heart disease examination, can more accurately reflect the left ventricular hemodynamic changes.