Reliability and validity of cervical auscultation

Area of Science:

• Otorhinolaryngology
• Speech and Language Pathology
• Biomedical Acoustics

Background:

• Cervical auscultation (CA) is explored as a tool for identifying patients at risk of aspiration/penetration.
• Understanding acoustic features of deglutition is crucial for assessing swallowing function.

Purpose of the Study:

• To identify acoustic markers of dysphagia.
• To compare swallowing acoustics in younger, older, and dysphagic adults.
• To evaluate the reliability and accuracy of CA in detecting dysphagia.

Main Methods:

• Analysis of pharyngeal phase swallow morphology in different subject groups.
• Assessment of inter-rater reliability and expert judgment concordance using CA.
• Comparison of CA findings with radiological definitions of aspiration/penetration.

Main Results:

• Significant differences in deglutition apnea duration, onset time, and number of gulps were found between younger and dysphagic groups.
• The number of gulps was the only parameter significantly distinguishing older from dysphagic groups.
• CA expert reliability showed fair agreement (AC1=0.46), with 70% specificity and 94% sensitivity for aspiration/penetration detection.

Conclusions:

• Swallowing sounds contain audible cues indicative of dysphagia and aspiration risk.
• CA can serve as an early warning system for high-risk patients.
• CA is not recommended as a standalone tool for diagnosing aspiration/penetration.