In my thesis I focused on the evaluation and the potential application of the cervical auscultation (CA) as an assessment tool to diagnose patients suspect to suffer from dysphagia.
The introductory theoretical part describes as well the basics of deglutition, the etiology, the manifestation of swallowing disorders. Hereby also scrutinized the age related changes of deglutition. Moreover, the first part deals critically with the established imaging techniques and clinical procedures in the management of dysphagia with respect to their test quality.
The empirical part starts with a digression about quality criteria. In a precursor study CA yields high sensitivity (94 percent) but less specificity (70 percent).
The evaluation study aims towards an evaluation of the reliability and validity of CA connected with parameters of the clinical swallow examination in detecting geriatric patients with high risk of aspiration/penetration. The evaluation of CA is carried out in terms of concordance and correctness of the ratings of speech and language therapists (SLTs). The assessment of CA's validity is grounded on the sensitivity and specificity of the SLTs' ratings. In addition, in order to determine whether each classification made on the ground of CA is right or wrong, the CA outcomes are correlated with a "gold standard", Fiberoptic Endoscopy Evaluation of Swallowing (FEES) in this case.
The results did not support a statistical funding of the CA. The method stand alone shows less agreement between the raters and respective the intra-rater agreement low sensitivity and specificity. The German raters yielded lower results as the international SLTs. Experience with CA increases clearly the CA judgements but the added clinical information and the video recordings increase the quality of the prognosis clearly. My thesis is a critical methodical evaluation of CA as an early appropriable non-invasive method in the diagnosis of dysphagia. The results demonstrate the limits of its validity.