Akinboboye O, Sumner J, Gopal A, King D, Shen Z, Bardfeld P, Blanz L, Brown E J
Department of Medicine, Nassau County Medical Center, East Meadow, New York, USA.
Clin Cardiol. 1995 Dec;18(12):726-9. doi: 10.1002/clc.4960181208.
Our purpose was to determine the learning curve of visual estimation of ejection fraction (EF) by echocardiography. Sixty consecutive patients, who had clinically indicated echocardiography and radionuclide ventriculography (RVG) within 1 month were selected. Five standard views were reviewed independently by a first-year cardiology fellow, a private cardiologist, and an experienced echocardiographer. Observers were given feedback of the RVG EFs immediately after estimating the EF on each study. To assess the effect of learning, the echocardiographic studies were divided into three groups of 20 and were read successively by each observer. A statistical comparison of the two methods was performed for each group. The correlation between the two techniques for the first group of studies was marginal. There was a significant improvement in the correlation with subsequent groups. The correlation did not change significantly with the last group of studies compared with the second group. In conclusion, visual estimation of EF by two-dimensional echocardiography can be learned, with a learning curve of approximately 20 studies if immediate feed-back is available.
我们的目的是确定通过超声心动图视觉评估射血分数（EF）的学习曲线。选取了60例在1个月内临床需要进行超声心动图和放射性核素心室造影（RVG）检查的连续患者。一名第一年的心脏病学研究员、一名私人心脏病专家和一名经验丰富的超声心动图检查人员分别独立查看五个标准视图。在每项研究中，观察者在估计EF后立即获得RVG EF的反馈。为了评估学习效果，将超声心动图研究分为三组，每组20例，由每位观察者依次阅读。对每组两种方法进行统计学比较。第一组研究中两种技术之间的相关性很微弱。随后几组的相关性有显著改善。与第二组相比，最后一组研究的相关性没有显著变化。总之，如果能获得即时反馈，二维超声心动图视觉评估EF是可以学会的，学习曲线约为20项研究。
