Can Continuous Non-invasive Monitoring Improve Stability of Intraoperative Blood Pressure - A Feasibility Study.

Exclusion Criteria

• •1. American Society of Anaesthesiologists (ASA) Class I patients
• •2. Patients with device-specific exclusions; atrial fibrillation, Raynauds syndrome or disease, peripheral vascular disease, scleroderma, an arteriovenous shunt, valvular heart disease.
• •3. Patients in whom a blood pressure cuff cannot be safely inflated on both arms for any reason (for example, lymphoedema).
• •4. Patients in whom the treating anaesthetist has judged they will require invasive arterial pressure monitoring.
• •5. Patients declining consent
• •6. Patients in whom the treating anaesthetist will use total intravenous anaesthesia (TIVA)
• •7. Patients in whom there is a \>20mmHg difference between non-invasive cuff mean arterial pressure measurements made on opposite arms.