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Parkinson’s Disease
Volume 2014 (2014), Article ID 159476, 6 pages
Research Article

Validation of the Persian Translation of the Swallowing Disturbance Questionnaire in Parkinson’s Disease Patients

1Isfahan Neuroscience Research Center, Isfahan University of Medical Sciences, Isfahan 8174673461, Iran
2Mahoor Clinic of Speech and Language Pathology, Iran
3Audiology Department, School of Rehabilitation Sciences, Isfahan University of Medical Sciences, Isfahan 8174673461, Iran
4Department of Speech and Language Pathologist, Tehran University of Medical Sciences, Tehran 141556559, Iran
5Department of Neurology, Isfahan University of Medical Sciences, Isfahan 8174673461, Iran

Received 27 July 2014; Accepted 7 October 2014; Published 27 October 2014

Academic Editor: Jan O. Aasly

Copyright © 2014 Ali Rajaei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Dysphagia, as a common finding in Parkinson’s disease (PD) patients, was estimated to be present in 80–95% of this population during different stages of the disease. The Swallowing Disturbance Questionnaire (SDQ) was created as a self-rated dysphagia screening tool in PD. According to the guidelines for cross-cultural adaptation, Persian version of this questionnaire (SDQ-P) was developed. 59 Persian patients (39 men and 20 women) participated in the study. They responded to the SDQ-P and underwent videofluoroscopic swallowing study (VFSS). Aspiration during VFSS was compared with questionnaire results for each individual. Cronbach’s alpha coefficient for the questionnaire was 0.86 and based on SDQ-P 15 patients (25.4%) were dysphagic, while 10 patients (16.9%) showed aspiration during VFSS. SDQ-P sensitivity and specificity in predicting aspiration were 96.7 and 91.2%; therefore, the SDQ-P could be a prognostic tool for aspiration. The positive predictive value (PPV), the negative predictive value (NPV), and the pre- and posttest probabilities of aspiration were 0.67, 1, 16.9%, and 66.7%, respectively. In summary, this study demonstrated the reliability and also the feasibility of SDQ-P for screening of aspiration in Iranian patients with PD. Further evaluation of SDQ-P in larger subject population would be suggested.