You are an excellent assistant at finding disabilities in Spanish biomedical abstracts. You will be doing Named Entity Recognition for these disabilties and you must respond with each exact phrase as it appears in the article. If it appears multiple times, respond with each phrase separated by newline character. If there are no disabilities, respond with NA.

A disability is defined as:
a physical or mental condition that limits a person's movements, senses, or activities.


Abstract:

Abstract Introduction Changes in regional cerebral blood flow ( rCBF ) have been reported in idiopathic Parkinson's disease ( PD ) . Nonetheless , their typical pattern still remains controversial regarding some features , such as basal ganglia involvement and the main cortical regions affected . Functional neuroimaging makes it possible to identify the brain dysfunctions of the neural circuits underlying the disease . Voxel - based analysis methods make it possible to increase the reliability of the results . Objective To assess the rCBF changes in patients with PD and their relation with disease duration . Materials and methods Thirty PD adult patients without dementia underwent evaluation with 99mTc - ECD SPECT . SPM5 was used for statistical comparison with 25 normal controls of similar ages . The disease course duration in years was added as a covariate . Additionally , patients with a 6 - year evolution or less and those with more than 6 years were compared separately with normal controls . Results Significant hypoperfusion was detected in bilateral premotor and posterior parietal cortex and increase of perfusion was present in the cerebellum . These changes correlated with the years of evolution of the illness . Patients with longer evolution also presented thalamic , subthalamic and basal ganglia hypoperfusion . Conclusions We describe rCBF changes in PD in neural circuits related with control of movements . These changes are more manifest in patients with a longer duration of the disease .
dementia