In the research reported here, we tested the hypothesis that sustained engagement in learning new skills that activated working memory, episodic memory, and reasoning over a period of 3 months would enhance cognitive function in older adults. In three conditions with high cognitive demands, participants learned to quilt, learned digital photography, or engaged in both activities for an average of 16.51 hr a week for 3 months. Results at posttest indicated that episodic memory was enhanced in these productive-engagement conditions relative to receptive-engagement conditions, in which participants either engaged in nonintellectual activities with a social group or performed low-demand cognitive tasks with no social contact. The findings suggest that sustained engagement in cognitively demanding, novel activities enhances memory function in older adulthood, but, somewhat surprisingly, we found limited cognitive benefits of sustained engagement in social activities.

Background Neurofilament light chain protein (NfL) is a promising biomarker of neurodegeneration. Objectives To determine whether plasma and CSF NfL (1) associate with motor or cognitive status in Parkinson's disease (PD) and (2) predict future motor or cognitive decline in PD. Methods Six hundred and fifteen participants with neurodegenerative diseases, including 152 PD and 200 healthy control participants, provided a plasma and/or cerebrospinal fluid (CSF) NfL sample. Diagnostic groups were compared using the Kruskal−Wallis rank test. Within PD, cross‐sectional associations between NfL and Unified Parkinson's Disease Rating Scale Part III (UPDRS‐III) and Mattis Dementia Rating Scale (DRS‐2) scores were assessed by linear regression; longitudinal analyses were performed using linear mixed‐effects models and Cox regression. Results Plasma and CSF NfL levels correlated substantially (Spearman r = 0.64, P < 0.001); NfL was highest in neurocognitive disorders. PD participants with high plasma NfL were more likely to develop incident cognitive impairment (HR 5.34, P = 0.005). Conclusions Plasma NfL is a useful prognostic biomarker for PD, predicting clinical conversion to mild cognitive impairment or dementia. © 2021 International Parkinson and Movement Disorder Society

Pearls & Oy-sters: Spontaneous intracranial hypotension and posterior reversible encephalopathy syndrome PEARLS• Although rare, cases of posterior reversible encephalopathy syndrome (PRES) secondary to CSF leak and intracranial hypotension have been documented in the literature.• The pathogenesis of PRES in these settings has been associated with both arterial and venous cerebrovascular dysfunction. OY-STERS• PRES should be suspected in patients with CSF leak who continue to experience headache, visual changes, and altered mentation despite conservative management.• The mainstay of treatment involves resolution of the CSF leak, typically with an autologous epidural blood patch.CASE REPORT A 65-year-old woman with no significant medical history was brought to the emergency room after experiencing 2 weeks of band-like occipital headaches and 2 days of progressive mental status changes. Her neurologic examination was significant for decreased alertness, disorientation to time, confabulation, loss of recent and remote memory, diffuse hyperreflexia, and a left Hoffmann sign. MRI of the brain with contrast showed bilateral subdural hygromas, diffuse enhancement of the dura mater, with mild sagging of the brainstem suggestive of intracranial hypotension (figure 1, A and B). MRI of the spine showed a large collection of CSF in the lumbar epidural space ( figure 2A); however, the tear site was not identified. EEG also revealed generalized slowing with no evidence of seizure activity. Her mental status continued to deteriorate despite conservative measures such as aggressive hydration, caffeine intake, and bedrest in the Trendelenburg position. A head CT was ordered for worsening mental status and revealed symmetric hypoattenuation of the bilateral parasagittal occipital cortices consistent with PRES ( figure 2B), a finding that was not present on the initial MRI. She then received an emergent lumbar epidural blood patch, resulting in dramatic improvement in mental status several hours later. She was discharged without any focal neurologic deficits. An MRI performed 10 days later revealed no evidence of PRES in the occipital region. An MRI of the lumbar spine performed 5 weeks later showed resolution of the fluid collection (figure 3).DISCUSSION Spontaneous intracranial hypotension (SIH) is a known neurologic condition characterized by occipital headaches, neck stiffness, and altered mentation that results from leakage of CSF through a structural break in the meninges. Distinct abnormalities on MRI support the diagnosis, including diffuse meningeal enhancement, subdural fluid collections, engorgement of the dural sinuses, and downward displacement of the brain that can result in compression of vital structures (figure 1, A and B). Stupor and coma, for example, have been linked to compression of the diencephalon. 1 While our patient's altered mental status was initially attributed to brain sagging, her clinical deterioration was complicated by a transient occipital hypodensity concerning for PRES (figure 2B). Although rare...

Background and ObjectiveCurrent studies of end-of-life care in Parkinson disease (PD) do not focus on diverse patient samples or provide national views of end-of-life resource utilization. We determined sociodemographic and geographic differences in end-of-life inpatient care intensity among persons with PD in the United States (US).MethodsThis retrospective cohort study included Medicare Part A and Part B beneficiaries 65 years and older with a qualifying PD diagnosis who died between January 1, 2017, and December 31, 2017. Medicare Advantage beneficiaries and those with atypical or secondary parkinsonism were excluded. Primary outcomes included rates of hospitalization, intensive care unit (ICU) admission, in-hospital death, and hospice discharge in the last 6 months of life. Descriptive analyses and multivariable logistic regression models compared differences in end-of-life resource utilization and treatment intensity. Adjusted models included demographic and geographic variables, Charlson Comorbidity Index score, and Social Deprivation Index score. The national distribution of primary outcomes was mapped and compared by hospital referral region using Moran I.ResultsOf 400,791 Medicare beneficiaries with PD in 2017, 53,279 (13.3%) died. Of decedents, 33,107 (62.1%) were hospitalized in the last 6 months of life. In covariate-adjusted regression models using White male decedents as the reference category, odds of hospitalization was greater for Asian (AOR 1.38; CI 1.11–1.71) and Black (AOR 1.23; CI 1.08–1.39) male decedents and lower for White female decedents (AOR 0.80; CI 0.76–0.83). ICU admissions were less likely in female decedents and more likely in Asian, Black, and Hispanic decedents. Odds of in-hospital death was greater among Asian (AOR 2.49, CI 2.10–2.96), Black (AOR 1.11, CI 1.00–1.24), Hispanic (AOR 1.59; CI 1.33–1.91), and Native American (AOR 1.49; CI 1.05–2.10) decedents. Asian and Hispanic male decedents were less likely to be discharged to hospice. In geographical analyses, rural-dwelling decedents had lower odds of ICU admission (AOR 0.77; CI 0.73–0.81) and hospice discharge (AOR 0.69; CI 0.65–0.73) than urban-dwelling decedents. Nonrandom clusters of primary outcomes were observed across the US, with highest rates of hospitalization in the South and Midwest (Moran I = 0.134;p< 0.001).DiscussionMost persons with PD in the US are hospitalized in the last 6 months of life, and treatment intensity varies by sex, race, ethnicity, and geographic location. These group differences emphasize the importance of exploring end-of-life care preferences, service availability, and care quality among diverse populations with PD and may inform new approaches to advance care planning.