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Changes in cerebral oxygenation based on intraoperative ventilation strategy

Authors Dewhirst E, Walia H, Samora WP, Beebe AC, Klamar JE, Tobias JD

Received 28 November 2017

Accepted for publication 7 May 2018

Published 25 July 2018 Volume 2018:11 Pages 253—258


Checked for plagiarism Yes

Review by Single anonymous peer review

Peer reviewer comments 2

Editor who approved publication: Dr Scott Fraser

Elisabeth Dewhirst,1 Hina Walia,1 Walter P Samora,2 Allan C Beebe,2 Jan E Klamar,2 Joseph D Tobias1,3

1Department of Anesthesiology and Pain Medicine, Nationwide Children’s Hospital, Columbus, OH, USA; 2Department of Orthopedic Surgery, Nationwide Children’s Hospital, The Ohio State University, Columbus, OH, USA; 3Department of Anesthesiology and Pain Medicine, The Ohio State University, Columbus, OH, USA

Introduction: Cerebral oxygenation can be monitored clinically by cerebral oximetry (regional oxygen saturation, rSO2) using near-infrared spectroscopy (NIRS). Changes in rSO2 have been shown to precede changes in pulse oximetry, providing an early detection of clinical deterioration. Cerebral oximetry values may be affected by various factors, including changes in ventilation. The aim of this study was to evaluate the changes in rSO2 during intraoperative changes in mechanical ventilation.
Patients and methods: Following the approval of the institutional review board (IRB), tissue and cerebral oxygenation were monitored intraoperatively using NIRS. Prior to anesthetic induction, the NIRS monitor was placed on the forehead and over the deltoid muscle to obtain baseline values. NIRS measurements were recorded each minute over a 5-min period during general anesthesia at four phases of ventilation: 1) normocarbia (35–40 mmHg) with a low fraction of inspired oxygen (FiO2) of 0.3; 2) hypocarbia (25–30 mmHg) and low FiO2 of 0.3; 3) hypocarbia and a high FiO2 of 0.6; and 4) normocarbia and a high FiO2. NIRS measurements during each phase were compared with sequential phases using paired t-tests.
Results: The study cohort included 30 adolescents. Baseline cerebral and tissue oxygenation were 81% ± 9% and 87% ± 5%, respectively. During phase 1, cerebral rSO2 was 83% ± 8%, which decreased to 79% ± 8% in phase 2 (hypocarbia and low FiO2). Cerebral oxygenation partially recovered during phase 3 (81% ± 9%) with the increase in FiO2 and then returned to baseline during phase 4 (83% ± 8%). Each sequential change (e.g., phase 1 to phase 2) in cerebral oxygenation was statistically significant (p < 0.01). Tissue oxygenation remained at 87%–88% throughout the study.
Conclusion: Cerebral oxygenation declined slightly during general anesthesia with the transition from normocarbia to hypocarbic conditions. The rSO2 decrease related to hypocarbia was easily reversed with a return to baseline values by the administration of supplemental oxygen (60% vs. 30%).

Keywords: pediatric, cerebral oxygenation, near infrared spectroscopy (nirs), intraoperative, ventilation

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