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收缩时间间期(Systolic Time Inter—vals,STI)已成为临床心脏病学“非侵入性”检查技术之一。其实,“非侵入性”一词首先即用于STI。STI是心脏功能的第一个非侵入性定量试验之一,至今仍是操作最简便和最可靠的一种方法。大多数测定心室作工(Ventricular per—formance)的试验或单独,或作为时间的函数而涉及力和/或距离。在这些试验中,STI是唯一只以时间为变数的方法。因此,STI有效性的确立有二个阶段:第一,确立体外时间测定是准确的;第二,用不以时间为原始变数的其他心功能参数验证STI。第一阶段在过去10年中已经完成,第二阶段的工作正在继续中。
Systolic Time Inter-vals (STI) has become one of the “non-invasive” clinical cardiology techniques. In fact, the word “non-intrusive” is first used for STI. STI is one of the first noninvasive quantitative tests of cardiac function and is by far the easiest and most reliable method of operation. Most tests that measure ventricular per-formance involve force and / or distance alone or as a function of time. In these experiments, STI was the only time-only method. Therefore, the validity of STI is established in two stages: first, establishing that in vitro time measurements are accurate; and second, verifying STI with other cardiac function parameters that do not take time as the original variable. The first phase has been completed in the past 10 years and the second phase is continuing.