Neurological Diseases or Conditions Clinical Trial
Official title:
Prevalence of Gag Reflex in Healthy Persons and Across Different Patient Groups and Its Relevance in Dysphagia Screening
The aim of this study is to assess the prevalence of gag reflex in healthy young and healthy older subjects as well as in acute stroke patients, in patients with Parkinsons´s Disease, Myasthenia gravis, Multiple Sclerosis and in geriatric patients.
In the clinical swallowing examination in acute stroke setting it is assumed that the absence of gag reflex is a predictor of aspiration risk. According to Daniels et al. (1997) aspiration can be predicted with 96% sensitivity in case of absent or abnormal gag reflex. In clinical experience of investigators testing of gag reflex highly depends on patients´compliance and individual anatomical features such as Mallampati score. Furthermore, even if gag reflex is absent, swallowing does not have to be impaired. The presence of gag reflex in healthy cohorts and dysphagic patients has been examined in a few studies. Davies et al. (1995) have shown that in 37% of healthy volunteers gag reflex was absent. Ramsey et al. (2005) have shown that approx. 89% of the patients without gag reflex had dysphagia and 31% without dysphagia had a gag reflex. In both studies it was not stated to what extent the gag reflex could be examined in case of a high Mallampati score. The present study aims at assessing the prevalence of gag reflex in healthy and neurological cohorts. The study protocol foresees testing of gag reflex in different oral areas (tongue, velum, pharyngeal wall) and evaluating present reactions. The Mallampati score is assessed in order to evaluate the feasibility of gag reflex test in case of higher Mallampati scores. All patients are tested once by one examiner. ;
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