Abstract
Purpose
The effect of head rotation on supraglottic airway (SGA) oropharyngeal leak pressure (OPLP) has not been well elucidated. The aim of this study was to help clarify which SGA device provides higher OPLP at head-rotated position.
Methods
Patients who underwent elective surgery under general anesthesia were enrolled and randomly divided into laryngeal mask airway (LMA®) ProSeal™ and i-gel® groups. The allocated SGA device was inserted under anesthesia. The primary outcome was OPLP, and secondary outcomes were ventilation score, expiratory tidal volume, and maximum pressure under volume-controlled ventilation (VCV) with an inspiratory tidal volume of 10 mL·kg−1 ideal body weight and fibreoptic view of the vocal cords at 0°, 30°, and 60° head rotation.
Results
Data from 78 and 76 patients were analyzed in the LMA ProSeal and i-gel groups, respectively. The mean (standard deviation) OPLP of the LMA ProSeal was significantly higher than that of the i-gel at the 60° head-rotated position (LMA ProSeal, 20.4 [6.5] vs i-gel, 16.9 [7.8] cm H2O; difference in means, 3.6; adjusted 95% confidence interval, 0.5 to 6.6; adjusted P = 0.02, adjusted for six comparisons). The maximum pressure under VCV at 60° head rotation was significantly higher in the LMA ProSeal group than in the i-gel group. The expiratory tidal volume of the LMA ProSeal did not significantly change with head rotation and was significantly higher than that of the i-gel at 60° head rotation. Ventilation score, fibreoptic view of the vocal cords, and complications were not significantly different between the ProSeal and i-gel groups.
Conclusions
The LMA ProSeal provides higher OPLP than the i-gel at a 60° head-rotated position under general anesthesia.
Trial registration
Japan Registry of Clinical Trials (https://jrct.niph.go.jp) (JRCT1012210043); registered 18 October 2021.
Résumé
Objectif
L’effet de la rotation de la tête sur la pression de fuite oropharyngée (OPLP en anglais) des dispositifs supraglottiques (DSG) n’est pas encore bien élucidé. L’objectif de cette étude était d’aider à déterminer quel DSG procurait une pression de fuite oropharyngée plus élevée lorsque la tête est en rotation.
Méthode
Les patient·es qui ont bénéficié d’une intervention chirurgicale non urgente sous anesthésie générale ont été recruté·es et aléatoirement réparti·es en deux groupes, soit masque laryngé (LMA®) ProSeal™ ou i-gel®. Le DSG alloué a été inséré sous anesthésie. Le critère d’évaluation principal était la pression de fuite oropharyngée, et les critères d’évaluation secondaires étaient le score de ventilation, le volume courant expiratoire et la pression maximale sous ventilation à volume contrôlé (VVC) avec un volume courant inspiratoire de 10 mL·kg−1 du poids corporel idéal et une visualisation fibroscopique des cordes vocales à une rotation de la tête de 0°, 30° et 60°.
Résultats
Les données de 78 et 76 patient·es ont été analysées dans les groupes LMA ProSeal et i-gel, respectivement. La pression de fuite oropharyngée moyenne (écart type) du LMA ProSeal était significativement plus élevée que celle de l’i-gel en position de rotation de la tête à 60° (LMA ProSeal, 20,4 [6,5] vs i-gel, 16,9 [7,8] cm H2O; différence de moyennes, 3,6; intervalle de confiance ajusté à 95 %, de 0,5 à 6,6; P = 0,02 ajusté, ajusté pour six comparaisons). La pression maximale sous VVC à une rotation de la tête de 60° était significativement plus élevée dans le groupe LMA ProSeal que dans le groupe i-gel. Le volume courant expiratoire du LMA ProSeal n’a pas changé de manière significative avec la rotation de la tête et était significativement plus élevé que celui de l’i-gel à une rotation de la tête de 60°. Le score de ventilation, la visualisation fibroscopique des cordes vocales et les complications n’étaient pas significativement différents entre les groupes ProSeal et i-gel.
Conclusion
Le LMA ProSeal procure une pression de fuite oropharyngée plus élevée que l’i-gel dans une position de rotation de la tête à 60° sous anesthésie générale.
Enregistrement de l’étude
Registre japonais des essais cliniques (https://jrct.niph.go.jp) (JRCT1012210043); enregistré le 18 octobre 2021.
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Author contributions
Tomohiro Chaki, Masatsugu Koizumi, and Shunsuke Tachibana contributed all aspects of this manuscript including study conception and design, analysis and interpretation of data, and drafting the article. Tomomi Matsumoto, Tomoe Kumagai, and Yuki Hashimoto contributed to acquisition of data and revising the article critically for important intellectual content. Michiaki Yamakage contributed to study conception and design, interpretation of data, and revising the article critically for important intellectual content.
Acknowledgement
The authors thank Tomoko Sonoda, DDS, PhD (Department of Basic Medical Sciences, Department of Public Health, Sapporo Medical University School of Medicine, Sapporo, Japan) for advice regarding statistical analyses. We would like to thank Editage (www.editage.com) for English language editing.
Disclosures
None.
Funding statement
Department of Anesthesiology, Sapporo Medical University School of Medicine, Japan.
Editorial responsibility
This submission was handled by Dr. Stephan K. W. Schwarz, Editor-in-Chief, Canadian Journal of Anesthesia/Journal canadien d’anesthésie.
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Chaki, T., Koizumi, M., Tachibana, S. et al. Comparing leak pressure of LMA® ProSeal™ versus i-gel® at head rotation: a randomized controlled trial. Can J Anesth/J Can Anesth 71, 66–76 (2024). https://doi.org/10.1007/s12630-023-02648-3
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DOI: https://doi.org/10.1007/s12630-023-02648-3