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beach chair position spontaneous ventilation

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https://www.readbyqxmd.com/read/29435810/effect-of-position-and-positive-pressure-ventilation-on-functional-residual-capacity-in-morbidly-obese-patients-a-randomized-trial
#1
Etienne J Couture, Steeve Provencher, Jacques Somma, François Lellouche, Simon Marceau, Jean S Bussières
PURPOSE: In morbidly obese patients, the position and ventilation strategy used during pre-oxygenation influence the safe non-hypoxic apnea time and the functional residual capacity (FRC). In awake morbidly obese volunteers, we hypothesized that the FRC would be higher after a five-minute period of positive pressure ventilation compared with spontaneous ventilation at zero inspiratory pressure. METHODS: Using a prospective crossover randomized trial design, obese subjects underwent, in a randomized order, a combination of one of three positions, supine (S), beach chair (BC), and reverse Trendelenburg (RT), and one of two ventilation strategies, spontaneous ventilation at zero inspiratory pressure (ZEEP-SV) or with positive pressure (PP-SV) set to an inspiratory pressure of 8 cmH 2 O, positive end-expiratory pressure of 10 cmH 2 O, and fraction of inspired oxygen of 0...
January 18, 2018: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/19490464/the-use-of-cerebral-oximetry-as-a-monitor-of-the-adequacy-of-cerebral-perfusion-in-a-patient-undergoing-shoulder-surgery-in-the-beach-chair-position
#2
Gregory W Fischer, Toni M Torrillo, Menachem M Weiner, Meg A Rosenblatt
Four cases of ischemic injury have been reported in patients undergoing orthopedic surgery in the upright position. We describe the use of cerebral oximetry as a monitor of the adequacy of cerebral perfusion in a 63-year-old woman who underwent arthroscopic rotator cuff surgery in a beach chair under general anesthesia. During positioning, a decrease in blood pressure was accompanied by a decrease in cerebral oxygen saturation (S(ct)O(2)) and was treated with phenylephrine. When spontaneous ventilation resumed, an increase in end-tidal carbon dioxide was accompanied by an increase in S(ct)O(2)...
July 2009: Pain Practice: the Official Journal of World Institute of Pain
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