Changes in arterial pressures and heart rate (HR), grouped by allocation (A) and orthostatic competence (B), during a standardized mobilization procedure before and 6 h after surgery. DAP = diastolic arterial pressure; OI = orthostatic intolerant; OT = orthostatic tolerant; SAP = systolic arterial pressure. *Different from supine; #different from preoperative evaluation; §different between groups (midodrine vs. placebo) or OI versus OT.