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Journal of Shoulder and Elbow Surgery

Evaluation of cerebral oxygen perfusion during shoulder arthroplasty performed in the semi–beach chair position

Published:August 09, 2019DOI:https://doi.org/10.1016/j.jse.2019.05.022

      Background

      The beach chair position is commonly used when performing shoulder arthroplasty. However, this position has been associated with hypotension, potentially leading to cerebral hypoperfusion, which may cause neurologic injury. In addition, shoulder arthroplasty cases are associated with longer operative times, posing a potentially greater risk of cerebral hypoperfusion. We aim to evaluate the risk of cerebral desaturation events (CDEs) during the course of total shoulder arthroplasty.

      Methods

      Twenty-six patients undergoing shoulder arthroplasties were monitored for changes in cerebral perfusion. Seven specific time-points during the procedure were labeled for comparison of events: baseline, beach chair, incision, humeral broaching, glenoid reaming, glenoid component implantation, and humeral component implantation. Cerebral oxygen perfusion was measured using near-infrared spectroscopy. A CDE was described as a decrease of oxygen saturation greater than 20%.

      Results

      Nineteeen of 25 subjects experienced a CDE. 42% of these patients experienced CDEs during semi–beach chair positioning. Patients experienced the largest oxygen saturation drop during semi–beach chair positioning. Transition from baseline to semi–beach chair was the only event to have a statistically significant decrease in cerebral perfusion (8%, P < .05). There was a statistically significant percentage change in mean oxygen saturation in the semi–beach chair interval (10%, P < .01) and the semi–beach chair to incision interval (7%, P < .01).

      Conclusions

      Most patients experienced an intraoperative CDE, with greatest incidence during semi–beach chair positioning. The largest decline in cerebral oxygen saturation occurred during semi–beach chair positioning. Implant implantation was not associated with decrease in cerebral oximetry.

      Level of evidence

      Keywords

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