Effect of Leg Elevation on Prevention of Intraoperative Hypotension During Beach Chair Position

The Effect of Leg Elevation on the Prevention of Intraoperative Hypotension During Shoulder Surgery in the Beach Chair Position

The aim of this study is to evaluate the effect of leg elevation on the prevention of intraoperative hypotension during shoulder surgery in the Beach-chair position. patients undergoing shoulder surgery in the Beach-chair position will be randomly assigned to Group L (with leg elevation) or Group C (no intervention). The primary outcome is the incidence of intraoperative hypotension (mean blood pressure < 60mmHg or systolic blood pressure < 80% of baseline). Secondary outcomes are the incidence of intraoperative cerebral desaturation (cerebral oxygen saturation < 80% of baseline, longer than 30 seconds), total amounts of administered inotropic agents, and systolic blood pressure, heart rate, and cerebral oxygen saturation at various time points.

Inclusion Criteria:

• adult patients undergoing shoulder surgery in the beach chair position

Exclusion Criteria:

• Patients with myocardial infarction
• Patients with pacemaker
• Patients with cerebrovascular disease
• patients with arteriovenous fistula at the opposite arm
• Patients with autonomic nerve disorders
• Patients with hip or knee joint disorder limiting hip or knee flexion
• BMI > 30 kg/m2