Risk of accidental injuries amongst Parkinson disease patients

Background and purpose: To investigate the spectrum and risks of accidental injuries (AIs) amongst Parkinson disease (PD) patients. Methods: The participants comprised PD patients aged 50 years and older who were initially diagnosed between 2000 and 2009, and a comparison group of non-PD patients. The incidence rates of accidental injury types amongst PD and non-PD patients were calculated; hazard ratios were calculated and adjusted for comorbidities, using 95% confidence intervals (CIs) of developing such outcomes in PD patients. Results: In total, 4046 PD patients and 16 184 non-PD patients were followed over time. The PD patients demonstrated the following incidence rates and hazard ratios in comparison to the control cohort for accidental injuries: all injuries, 19.78 per 100 person-years (100 PYs), adjusted hazard ratio (HR) 1.30 (95% CI 1.24-1.36); head injury, 2.95 per 100 PYs, HR 1.88 (95% CI 1.64-2.15); bone fracture and dislocation, 4.61 per 100 PYs, HR 1.39 (95% CI 1.25-1.54); burns, 0.66 per 100 PYs, HR 1.01 (95% CI 0.78-1.32); injury to spinal cord, plexus and nerves, 0.15 per 100 PYs, HR 1.25 (95% CI 0.72-2.17); superficial injuries and contusions, 11.41 per 100 PYs, HR 1.20 (95% CI 1.12-1.27). The injury risk for the 69-79 years age group in PD compared with controls of the same age (HR 1.38) was significantly higher compared with that of the 50-69 age groups in PD and controls (HR 1.16). Conclusions: Parkinson disease patients demonstrate a significantly elevated risk of developing all accidental injury types except burn injuries and injuries to spinal cord, plexus and nerves, compared with age-matched controls. The risk increases as age increases.