deep brain stimulation and responsiveness of the persian version of parkinson's disease questionnaire with 39-items.

background:  assessment  of quality-of-life (qof) as  an outcome   measure   after  deep   brain  stimulation   (dbs) surgery in patients  with parkinson’s disease  (pd) need  a valid, reliable and responsive  instrument. the aim of the current   study   was   to   determine   responsiveness   of validated  persian  version  of pd questionnaire  with  39- items (pdq-39) after dbs surgery in patients with pd. methods: eleven patients with pd, who were candidate  for dbs  operation  between may 2012 and  june  2013 were assessed.  pdq-39 and  short-form  questionnaire  with 36- items (sf-36) were used. to assess responsiveness of pdq- 39 standardized response mean (srm) was used. results: mean age was 51.8 (8.8) and all of the patients, but just  one  were  male  (10 patients). mean duration  of the disease was 8.7 (2.1) years. eight patients  were categorized as moderate using hoehn and yahr (h and y) classification. all patients  had a better  h and y score compared  with the baseline evaluation (3.09 vs. 0.7 ). the amount  of srm was above  0.70 for all domains  means  a large responsiveness for pdq-39. conclusion: persian version of pdq-39 has an acceptable responsiveness and could be used to assess as an outcome measure to evaluate the effect of therapies on pd.