title: Orthopedic Surgery and Post-Operative Cognitive Decline in Idiopathic Parkinson's Disease: Considerations from a Pilot Study.
abstract: BACKGROUND
  Post-operative cognitive dysfunction (POCD) demarks cognitive decline after major surgery but has been studied to date in "healthy" adults. Although individuals with neurodegenerative disorders such as Parkinson's disease (PD) commonly undergo elective surgery, these individuals have yet to be prospectively followed despite hypotheses of increased POCD risk.
  
  
  OBJECTIVE
  To conduct a pilot study examining cognitive change pre-post elective orthopedic surgery for PD relative to surgery and non-surgery peers.
  
  
  METHODS
  A prospective one-year longitudinal design. No-dementia idiopathic PD individuals were actively recruited along with non-PD "healthy" controls (HC) undergoing knee replacement surgery. Non-surgical PD and HC controls were also recruited. Attention/processing speed, inhibitory function, memory recall, animal (semantic) fluency, and motor speed were assessed at baseline (pre-surgery), 3 weeks, 3 months, and 1 year post- orthopedic surgery. Reliable change methods examined individual changes for PD individuals relative to control surgery and control non-surgery peers.
  
  
  RESULTS
  Over two years we screened 152 older adult surgery or non-surgery candidates with 19 of these individuals having a diagnosis of PD. Final participants included 8 PD (5 surgery, 3 non-surgery), 47 Control Surgery, and 21 Control Non-Surgery. Eighty percent (4 of the 5) PD surgery declined greater than 1.645 standard deviations from their baseline performance on measures assessing processing speed and inhibitory function. This was not observed for the non-surgery PD individuals.
  
  
  CONCLUSIONS
  This prospective pilot study demonstrated rationale and feasibility for examining cognitive decline in at-risk neurodegenerative populations. We discuss recruitment and design challenges for examining post-operative cognitive decline in neurodegenerative samples.
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.|Anesthesiology, University of Florida, FL, USA.|Center for Movement Disorders and Neurorestoration, University of Florida, FL, USA.
authors.forename: Catherine C
authors.initials: CC
authors.lastname: Price
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.
authors.forename: Shellie-Anne
authors.initials: SA
authors.lastname: Levy
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.
authors.forename: Jared
authors.initials: J
authors.lastname: Tanner
authors.affiliation: College of Nursing, University of Florida, FL, USA.
authors.forename: Cyndi
authors.initials: C
authors.lastname: Garvan
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.
authors.forename: Jade
authors.initials: J
authors.lastname: Ward
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.
authors.forename: Farheen
authors.initials: F
authors.lastname: Akbar
authors.affiliation: Clinical and Health Psychology, University of Florida, FL, USA.|Center for Movement Disorders and Neurorestoration, University of Florida, FL, USA.|Neurology, University of Florida, FL, USA.
authors.forename: Dawn
authors.initials: D
authors.lastname: Bowers
authors.affiliation: Anesthesiology, University of Florida, FL, USA.|Anesthesiology, Vanderbilt University, TN, USA.
authors.forename: Mark
authors.initials: M
authors.lastname: Rice
authors.affiliation: Center for Movement Disorders and Neurorestoration, University of Florida, FL, USA.|Neurology, University of Florida, FL, USA.
authors.forename: Michael
authors.initials: M
authors.lastname: Okun
mesh_terms: D000368:Aged; D019645:Arthroplasty, Replacement, Knee / Q000009:adverse effects*; D003072:Cognition Disorders / Q000209:etiology*; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010300:Parkinson Disease / Q000150:complications*; D010865:Pilot Projects; D011183:Postoperative Complications / Q000503:physiopathology*
keywords: Orthopedics; arthroplasty; executive function; memory; neurodegenerative