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The effect of the beach-chair position angle on cerebral oxygenation during shoulder surgery.

Abstract：

BACKGROUND:Although the safety of the beach-chair position (BCP) is widely accepted, rare devastating neurologic complications have been reported and attributed to cerebral hypoperfusion. Cerebral oxygenation (regional oxygen saturation [rSO2]) can be monitored noninvasively using near-infrared spectroscopy. The purpose of this study was to determine the effect of BCP angle on cerebral oxygenation in patients undergoing shoulder surgery in the BCP. METHODS:Fifty patients undergoing shoulder arthroscopy were prospectively enrolled to participate. Following induction of general anesthesia, each patient's rSO2 was recorded at 0° of elevation and again at 30°, 45°, 60°, and 80° of elevation. Mean rSO2 values and mean differences in rSO2 were reported. RESULTS:An average total decrease of 5% in rSO2 was seen when comparing 0° with 80° (P < .001). There were statistically significant differences in rSO2 values at beach-chair angles of 0° versus 30° (P <.001), 30° versus 45° (P = .007), and 45° versus 60° (P <.001) but not between 60° and 80° (P = .12). The decrease in rSO2 was similar between each progressive increase in the beach-chair angle, leading to a linear decline in rSO2 as the BCP increased (regression slope of -0.060%/°, P <.001). No patient's cerebral oxygenation dropped greater than 20% from baseline. Neither body mass index nor American Society of Anesthesiologists score had a significant impact on the relation of rSO2 to BCP angle. CONCLUSIONS:The average drop in rSO2 is significantly less than the threshold of 20% used as an identifier for a cerebral deoxygenation event. This study illustrates the direct effect the BCP angle has on cerebral oxygenation.

journal_name

J Shoulder Elbow Surg

journal_title

Journal of shoulder and elbow surgery

authors

Songy CE,Siegel ER,Stevens M,Wilkinson JT,Ahmadi S

doi

10.1016/j.jse.2017.03.018

subject

Has Abstract

pub_date

2017-09-01 00:00:00

pages

1670-1675

issue

9

eissn

1058-2746

issn

1532-6500

pii

S1058-2746(17)30179-9

journal_volume

26

pub_type

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