Evaluation of doctor/patient satisfaction with the use of the Parkinson's Disease Dementia-Short-Screen (PDD-SS): a screening test for dementia in Parkinson's disease (DIFFUSION study).

INTRODUCTION Parkinson disease (PD) has no specific neuropsychological scales for assessing the most significant cognitive impairment in PD, which has determined the use of subjective criteria or instruments designed for other diseases, making difficult the comparison between studies or the follow-up of patients. A screening test for dementia in PD (Parkinson's Disease Dementia-Short Screen [PDD-SS]) has recently been validated. To assess the degree of satisfaction of patients and researchers through the use of PDD-SS in clinical practice. PATIENTS AND METHODS An observational, cross-over, multicentre and national study was conducted on 471 patients with PD. The degree of patient satisfaction was measured using a questionnaire in which the items scored from 0 to 10 on a visual analogue scale (0 = strongly disagree, 10 = completely agree), while the researchers were determined on a 1-5 point Likert scale (1 = strongly disagree, 5 = completely agree). RESULTS A total of 171 patients (36.3%) patients had dementia associated with PD according to the PDD-SS, of whom 77.3% said they were satisfied with its use. The overall measurement of researcher satisfaction was 3.6±0.6 points. Ninety per cent (n=45) of them reported an overall score >3 points in the satisfaction questionnaire. The mean values of perception of applicability, usability and reliability of PDD-SS among researchers was 3.5±0.7, 3.7±0.6 and 3.1±0.5 points, respectively. CONCLUSIONS PD patients, as well as most of the researchers, were satisfied with the use of PDD-SS in clinical practice.