Estimating exercise PaCO2 in patients with heart failure with preserved ejection fraction

Abstract

[Formula: see text] provides a better estimate of [Formula: see text] than PJCO2 at peak exercise, and VD/VT[ET] provides a better estimate of VD/VT[art] than VD/VT[J] at peak exercise. Although we reported significant correlations, we did not find an identity between [Formula: see text] and estimates of [Formula: see text], nor did we find an identity between VD/VT[art] and estimates of VD/VT[art]. Thus, caution should be taken and estimates of [Formula: see text] and VD/VT should only be used if sampling arterial blood during CPET is not feasible.