title: To measure is to know - But know what you measure.
authors.affiliation: Department of Anesthesiology and Intensive Care Medicine, Technische Universität Dresden, Dresden, Germany - peter.spieth@uniklinikum-dresden.de.
authors.forename: P M
authors.initials: PM
authors.lastname: Spieth
authors.forename: R C E
authors.initials: RC
authors.lastname: Francis
mesh_terms: D002302:Cardiac Output; D006439:Hemodynamics; D006801:Humans; D008991:Monitoring, Physiologic