Assessing Laryngeal Obstruction During CPET

CPET in the PDA-surgery group was performed with concomitant continuous transnasal flexible video-laryngoscopy (ENF TYPE V2, video processor CV-170, OLYMPUS, Tokyo, Japan) as described previously (22 (link)). LVCP was identified and later verified by laryngeal stroboscopy. The video recordings of the laryngeal inlet during treadmill running were assessed and rated for laryngeal obstruction according to a modified version of the classification described by Maat et al. (23 (link)). Because of laryngeal asymmetry in subjects with LVCP, a modified CLE-score (0–24 points) was developed, assessing the right and left glottic and supraglottic areas separately. The visually assessed medial rotation of the aryepiglottic folds and medialization of the vocal folds were scored ranging from normal (0 points) to maximal (3 points) at moderate (fast walking) and at maximal effort. The left and right sides were scored separately. The total modified CLE-score was the sum of the sub-scores at moderate and maximal exercise.

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Engan M., Engeset M.S., Sandvik L., Gamlemshaug O.C., Engesæter I.Ø., Øymar K., Vollsæter M., Røksund O.D., Hufthammer K.O., Halvorsen T, & Clemm H.H. (2022). Left Vocal Cord Paralysis, Lung Function and Exercise Capacity in Young Adults Born Extremely Preterm With a History of Neonatal Patent Ductus Arteriosus Surgery—A National Cohort Study. Frontiers in Pediatrics, 9, 780045.

Publication 2021

ENF TYPE V2 CV-170

Cpet Glottic Laryngeal Laryngoscopy Stroboscopy Surgery Vocal folds

Corresponding Organization : University of Bergen

Other organizations : Western Norway University of Applied Sciences, Stavanger University Hospital, Norwegian School of Sport Sciences

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Variable analysis

independent variables

Continuous transnasal flexible video-laryngoscopy (ENF TYPE V2, video processor CV-170, OLYMPUS, Tokyo, Japan)

dependent variables

Laryngeal obstruction
Medial rotation of the aryepiglottic folds
Medialization of the vocal folds

control variables

Laryngeal stroboscopy was used to verify the identification of LVCP

controls

Positive control: Laryngeal stroboscopy was used to verify the identification of LVCP
Negative control: Not mentioned

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