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Korean Circ J. 1977 Dec;7(2):1-6. Korean. Original Article.
Yoon CJ , Park WH , Park HM .

Left ventficular ejection times were measured by four different methods in 200 healthy males and females from the polygraphic tracings including an apexcardiogram, a phonocardiogram and a carotid pulse tracing. The results obtained by each method were compared and the adequacy of each method was critically reviewed. It was felt that the method measuring the left ventricular ejection time from the carotid pulse tracing was the most reasonable. However, there was a significant correlation between the carotid-derived values and those obtained by other methods, thus, regression equations for the relationship of the latter values to the fromer were obtainable.

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