Lax J A, Bermann A M, Cianciulli T F, Morita L A, Masoli O, Prezioso H A
Echocardiography Laboratory, Division of Cardiology, Hospital del Gobierno de la Ciudad de Buenos Aires Dr Cosme Argerich, Buenos Aires, Argentina.
J Am Soc Echocardiogr. 2000 Feb;13(2):116-23. doi: 10.1016/s0894-7317(00)90022-1.
The index of myocardial performance combining systolic and diastolic time intervals (Index) is a useful method, already explained in past studies, that offers new values that have not been widely known among clinical cardiologists. The aim of this study is to obtain from this Index a measurement of the ejection fraction (EF), which is a very well-known value. The study involved 97 patients with myocardial infarction, 55 of whom were studied retrospectively (group A, aged 46-62 years, 50 men) to obtain and test the formula EF = 60 - (34 x Index). The second group (group B, aged 47-63 years, 40 men) included 42 patients who were evaluated prospectively. The EF obtained was compared with that reached through the use of radionuclide angiography (EF-RNA). The Index was obtained through the use of the formula (a - b)/b, where a is the interval between cessation and onset of the mitral inflow, and b is the ejection time. In group A the EF obtained by the Index (EF-Index) was 37.5% +/-.8%, and the EF-RNA was 37.7% +/- 11% (r = 0.76). In group B the EF-Index was 41.6% +/- 7%, and the EF-RNA was 41.2% +/- 10% (r = 0. 75).
Through the new formula described here it is possible to obtain a reliable measurement of the EF in patients with myocardial infarction, a well-known and extremely useful value, especially for those patients with poor acoustic windows.
结合收缩期和舒张期时间间期的心肌性能指数（指数）是一种有用的方法，过去的研究中已有阐述，它提供了临床心脏病学家中尚未广泛知晓的新数值。本研究的目的是从该指数中得出射血分数（EF）的测量值，射血分数是一个广为人知的数值。该研究纳入了97例心肌梗死患者，其中55例进行回顾性研究（A组，年龄46 - 62岁，50名男性）以获取并测试公式EF = 60 - (34×指数)。第二组（B组，年龄47 - 63岁，40名男性）包括42例进行前瞻性评估的患者。将获得的EF与通过放射性核素血管造影术得出的EF（EF - RNA）进行比较。指数通过公式(a - b)/b得出，其中a是二尖瓣血流停止与开始之间的间期，b是射血时间。在A组中，通过指数得出的EF（EF - 指数）为37.5%±0.8%，EF - RNA为37.7%±11%（r = 0.76）。在B组中，EF - 指数为41.6%±7%，EF - RNA为41.2%±10%（r = 0.75）。
通过此处描述的新公式，可以可靠地测量心肌梗死患者的EF，这是一个广为人知且极其有用的数值，尤其对于那些声学窗口不佳的患者。
