Predictive value of clinical indices in detecting aspiration in patients with neurological disorders
- Fabiola Maria,
- Monica Mateia,
- Maria Gabriella Ceravoloa,
- Anna Pisanib,
- Alfeo Montesib,
- Leandro Provincialia
- aNervous System Disease Institute, University of Ancona, Italy, bDepartment of Radiology UmbertoI Hospital of Ancona, Italy
- Professor Leandro Provinciali, Clinica di Neuroriabilitazione, Ospedale Torrette, Ancona, Italy I-60020.
- Received 18 January 1997
- Revised 14 April 1997
- Accepted 15 April 1997
Abstract
OBJECTIVES (1) To evaluate the predictive value of a detailed clinical screening of aspiration in patients withneurological diseases, both with and without symptoms of dysphagia taking videofluoroscopy as the gold standard; (2) to assess the existence of risk factors for silent aspiration, measuring the cost-benefit ratio of radiological examination.
METHODS 93 consecutive patients meeting the diagnostic criteria for a neurological disease with a risk of swallowing dysfunctions (cerebrovascular accidents, brain injury, Parkinson’s disease, multiple sclerosis, amyotrophic lateral sclerosis, myotonic dystrophy, and abiotrophic diseases) underwent a detailed clinical assessment using a 25 item form to check for symptoms of dysphagia and impairment of the oropharyngeal swallowing mechanism. The 3 oz water swallow test was also performed to assess the aspiration risk. Sensitivity, specificity, positive predictive, and negative predictive values (NPV) of dysphagia, history of cough on swallowing, and 3 oz test positivity, versus videofluoroscopy documented aspiration, taken as the gold standard, were measured in all the patients and in subgroups with different neurological disorders.
RESULTS Non-specific complaints of dysphagia showed a very poor predictive value, whereas the symptom “cough on swallowing” proved to be the most reliable in predicting the risk of aspiration, with 74% sensitivity and specificity, 71% positive predictive, and 77% negative predictive value. The standardised 3-oz test had a higher predictive potential than the clinical signs, but had low sensitivity. The association of cough on swallowing with the 3 oz test gave a positive predictive of 84%, and an negative predictive value of 78%. In cases where the clinical tests failed to detect any impairment, videofluoroscopy documented only a low risk (20%) for mild aspiration.
CONCLUSIONS The association of two clinical items (such as history of cough on swallowing and 3 oz test positivity) provides a useful screening tool, the cost:benefit ratio of which seems very competitive in comparison with videofluoroscopy in aspiration risk evaluation.
