Advancements in hemodynamic monitoring technology now allow clinicians to obtain data by using minimally invasive techniques. Devices utilizing this technology can be connected to vascular access routinely utilized in the intensive care setting such as arterial lines. These devices provide parameters such as systolic pressure variation (SPV), pulse pressure variation (PPV) and stroke volume variation (SVV) to predict fluid responsiveness of critically ill, mechanically ventilated patients. Studies evaluating these parameters have shown them to have a 84-94% positive predictive value for fluid responsiveness. In addition, higher variability in studied parameters were indicative of patients who were more likely to be responsive to fluid challenges.