The Continuity Study

Inclusion Criteria: 1. Signed informed consent 2. Age ≥ 18 years 3. ASA Physical Status ≥ 2 4. Scheduled for elective noncardiac surgery with intermittent arterial blood pressure monitoring using oscillometric arm cuff Exclusion Criteria: 1. Patient who is known to be pregnant 2. Patient with existing or planned arterial pressure catheter 3. Patient in whom systolic arterial pressure differs by more than 20 mmHg between the right and left arms 4. Inability to place oscillometric cuff on the subject's upper extremity 5. Extreme contraction of the smooth muscle in the arteries and arterioles of the lower arm and hand, such as may be present in patients with Raynaud's disease 6. Finger or hand deformity that prevents proper placement of finger cuff by visual inspection 7. Inability to place finger cuffs due to subject anatomy, condition, or obstructive paraphernalia (such as false nails)