Quantitative rating of video-laryngostroboscopy: a reliability study

Area of Science:

• Laryngology
• Phoniatrics
• Medical Imaging Analysis

Background:

• Videolaryngostroboscopy (VLS) is crucial for assessing vocal fold dynamics.
• Standardized protocols are needed to ensure reliable interpretation of VLS recordings.
• Variability in rating can impact clinical diagnosis and research comparability.

Purpose of the Study:

• To evaluate the reliability and validity of a differentiated protocol for rating VLS recordings.
• To determine the interobserver and intraobserver agreement for various laryngeal parameters.
• To identify factors influencing the consistency of VLS interpretation.

Main Methods:

• 30 high-quality VLS recordings of vocal fold pathologies were analyzed.
• Seven experienced laryngologists/phoniatricians independently rated the recordings using a standardized protocol.
• Interobserver and intraobserver agreement were assessed for multiple parameters.

Main Results:

• High interobserver agreement was observed for amplitude, mucosal wave, and closure/symmetry type.
• Satisfactory agreement was found for regularity, consistency, and lesion vibration.
• Moderate to low agreement was noted for glottic closure grade and symmetry.
• Raters trained with the protocol demonstrated higher agreement.
• Good intraobserver consistency was achieved across all parameters.

Conclusions:

• A standardized protocol significantly enhances the reliability of VLS recording interpretation.
• Training in the protocol improves diagnostic consistency among clinicians.
• The protocol shows high reliability for key parameters like mucosal wave and amplitude.
• Further refinement may be needed for parameters like glottic closure grade and symmetry.