[1]Department of Internal Medicine Division of Nephrology and Hypertension Texas Tech University Health Sciences Center Lubbock TX 79430 United States;
[2]Department of Internal Medicine Division of Pulmonary and Critical Care Medicine Texas Tech University Health Sciences Center Lubbock TX 79430 United States;
Shock; Volume status; Fluid; Vasopressors; Mean systemic pressure; Pulse pressure; Plethysmography variability index;