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Previous Volume 328:1423-1424 May 13, 1993 Number 19 Next

	Since this article has no abstract, we have provided an extract of the first 100 words of the full text and any section headings.

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To the Editor: McIntyre and colleagues recently described a way to predict the pulmonary-capillary wedge pressure (PCWP) from changes in peripheral arterial "pulse-volume" following the Valsalva maneuver (Dec. 10 issue)¹. They claimed that their method possessed "a clinically useful degree of accuracy" according to linear regression analysis, but they failed to assess its precision properly.

Figure 1 shows a conventional 95 percent confidence interval for the relation between the change in the pulse-amplitude ratio and the change in the mean PCWP, based on the authors' data. Although the variables are strongly correlated, the width of the confidence interval is . . . [Full Text of this Article]

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