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

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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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