Miller JB, et al. - Researchers planned this study to evaluate clinical and laboratory measures of intravascular volume status compared to more objective measures using ultrasound measurements of the inferior vena cava (IVC). A poor correlation was demonstrated between IVC assessment of intrasvascular volume and blinded clinician assessment or laboratory markers of dehydration. The majority of acute ischemic stroke patients were hypertensive and demonstrated low intravascular volume based on IVC ultrasound.