Validation of the Japanese translation of the Swallowing Disturbance Questionnaire in Parkinson’s disease patients
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The Swallowing Disturbance Questionnaire (SDQ) was developed as a self-rated screening tool for dysphagia in patients with Parkinson’s disease (PD). We developed the Japanese version of this questionnaire (SDQ-J), according to the cross-cultural adaptation guidelines, and examined its reliability.
Subjects were 61 Japanese patients with PD (mean age, 67.0 ± 9.2 years) who answered the SDQ-J before undergoing videofluoroscopic examination of swallowing (VF). We compared the findings of the questionnaire with the patients’ aspiration status during VF.
Cronbach’s alpha coefficient for the 15 questions of the SDQ-J was 0.84. According to the SDQ-J, 15 patients (24.6%) were diagnosed with dysphagia, while 9 patients (14.8%) aspirated liquid during VF. The sensitivity and specificity of the SDQ-J in predicting aspiration were 77.8 and 84.6%, respectively; therefore, the SDQ-J significantly predicted aspiration during VF (P < 0.01). The positive predictive value (PPV) and negative predictive value (NPV) for the SDQ-J were 0.46 and 0.96, respectively.
The SDQ-J appears to be a reliable and useful screening tool for Japanese PD patients with aspiration. As the NPV was higher than the PPV in the SDQ-J, this questionnaire could potentially be used for early identification of severe dysphagia in patients with PD.
KeywordsParkinson’s disease Dysphagia Questionnaires Fluoroscopy
Videofluoroscopic examination of swallowing
Swallowing Disturbance Questionnaire
Japanese version of the SDQ
Positive predictive value
Negative predictive value
Speech and language pathologist
Fiberoptic endoscopic evaluation of swallowing
The authors thank Y. Manor (Tel-Aviv Sourasky Medical Center) for the permission to use the SDQ and proofreading the back translation. This work was supported by a TMC Young Investigator Fellowship from the National Center of Neurology and Psychiatry (NCNP), Japan, and by an Intramural Research Grant (22–Y2) for Neurological and Psychiatric Disorders that was also awarded by the NCNP.
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