Shoulder Surgery in the Beach Chair Position Is Associated With Diminished Cerebral Autoregulation but no Differences in Postoperative Cognition or Brain Injury Biomarker Levels Compared With Supine Positioning: The Anesthesia Patient Safety Foundation Beach Chair Study. Issue 3 (June 2015) - Laflam, Andrew; Joshi, Brijen; Brady, Kenneth; Yenokyan, Gayane; Brown, Charles; Everett, Allen; Selnes, Ola; McFarland, Edward; Hogue, Charles W.