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.
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