Overview
This is a randomized trial investigating the effect of oscillometric blood pressure monitoring at 2.5-minute intervals - compared to 5-minute intervals - on intraoperative hypotension. Specifically, the investigators will test the primary hypothesis that oscillometric blood pressure monitoring at 2.5-minute intervals - compared to 5-minute intervals - reduces the time-weighted average mean arterial pressure below 65 mmHg in patients having non-cardiac surgery.
Eligibility
Inclusion Criteria:
- ≥45 years
- scheduled for elective non-cardiac surgery under general anesthesia
- planned oscillometric blood pressure monitoring with an upper-arm cuff
- American Society of Anesthesiologists physical status class II or higher
Exclusion Criteria:
- emergency surgery
- arm or shoulder surgery
- pregnancy
- preoperative blood pressure differences between the right and left arm of more than 20 mmHg
- intraoperative invasive blood pressure monitoring
- previous preoperative peripheral nerve injury (such as diabetic neuropathy, carpal tunnel syndrome, or cervical radiculopathy)
- contraindication for continuous finger-cuff blood pressure monitoring (e.g., Raynaud's disease, arterial-venous shunts, or cardiac assist devices)