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Dynamic vocal cord behavior and stridor during emergence from general anesthesia in small children with supraglottic airway

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Abstract

Purpose

Stridor during emergence from anesthesia is not rare in children managed with supraglottic airway (SGA). However, we know little about the mechanisms of stridor and behavior of the vocal cords (VC). This study aimed to clarify patterns of VC movement and laryngeal airway maintenance function during recovery from anesthesia in children with SGA.

Methods

This is a secondary analysis of data collected from an observational study involving 27 anesthetized children. Using a multi-panel recording system, endoscopic VC image, vital sign monitor, multi-channel tracings of respiratory variables and respiratory sound and patient’s view were simultaneously captured in one monitor. Inspiratory and expiratory VC angles formed by lines connecting anterior and posterior commissures were measured at the first spontaneous breath and the breath one minute after the first breath. VC narrowing and dilation were assessed by differences of VC angles.

Results

Inspiratory VC narrowing (median (IQR): 5.3 (2.7, 9.1) degree at the first breath) and dilation (− 2.7 (− 3.8, − 1.7) degree at the first breath) were observed in 15 and 12 out of 27 children, respectively. The former group achieved greater tidal volume compared to the latter in one minute. Five children (19%) temporarily developed stridor-like sound from outside with inspiratory VC narrowing. The stridor-like sound was captured by microphones attached to the neck and anesthesia circuit, but was not evident from the chest.

Conclusion

Laryngeal narrowing occurs in half of the children with SGA during emergence from anesthesia, and temporal stridor-like sound is relatively common.

Clinical trial registration

UMIN (University Hospital Information Network) Clinical Registry: UMIN000025058 (https://upload.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000028697).

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Data availability

The data that support the findings of this study are not openly available due to reasons of sensitivity and are available from the corresponding author upon reasonable request. Data are located in controlled access data storage at Chiba University Hospital.

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Acknowledgements

Sara Shimizu M.D. (Shimizu Orthopedic Plastic Surgery Clinic, Tokyo, Japan) greatly helped to improve this manuscript.

Funding

Japan Society for the Promotion of Science, 17K16722, Katsuhiko Ishibashi, 20K17830, Katsuhiko Ishibashi.

Author information

Authors and Affiliations

Authors

Contributions

Study design: KI, YK, SI. Data collection: KI, YK, SK, MS, YS (Sakaguchi). Data analysis: KI, SK. Statistical analysis and advice: YS (Sato), SI. Writing up the draft of the manuscript: KI, YK, SI, YS (Sato). Approval of the final version: KI, YJ, MS, YS, YS, SI.

Corresponding author

Correspondence to Katsuhiko Ishibashi.

Ethics declarations

Conflict of interest

This study was supported by JSPS KAKENHI Grant number 17K16722 and 20K17830 (Katsuhiko Ishibashi). Other authors have no conflict of interest. 

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Ishibashi, K., Kitamura, Y., Kato, S. et al. Dynamic vocal cord behavior and stridor during emergence from general anesthesia in small children with supraglottic airway. J Anesth 37, 672–680 (2023). https://doi.org/10.1007/s00540-023-03218-z

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  • DOI: https://doi.org/10.1007/s00540-023-03218-z

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