Applicability of Pulse Pressure Variation during Unstable Hemodynamic Events in the Intensive Care Unit: A Five-Day Prospective Multicenter Study

Figure 1

Flow chart showing pulse pressure variation applicability according to the accumulation of applicability criteria. This flow chart shows that one chosen criterion includes 159 UHE, two criteria include 129 UHE, three criteria include 108 UHE, four criteria include 71, five criteria include 45, and all criteria include 12 UHE. This figure systematically evaluates a large group of patients by exclusion criteria, and once a patient was excluded no further criteria were considered for that patient. We used this format to describe how a clinician might systematically approach the use of PPV in a patient. HR: heart rate; RR: respiratory rate; TV: tidal volume; UHE: unstable hemodynamic events.