Should we offer the surgeon a break?

To the Editor: Le Manach et al. present a study demonstrating the experimental applicability of changes in pulse pressure variation (dPPV) for the prediction of changes in cardiac output (dCO). The study is accompanied by a panegyric editorial answering the rhetorical question whether we need to monitor CO during surgery with a resounding NO! We now have dPPV!1,2 There is, however, a number of considerations to be made before this opinionist view is accepted— or rejected.