Sleep disturbances and gastrointestinal dysfunction are associated with thalamic atrophy in Parkinson's disease.

BACKGROUND: Non-motor symptoms are common aspects of Parkinson's disease (PD) occurring even at the prodromal stage of the disease and greatly affecting the quality of life. Here, we investigated whether non-motor symptoms burden was associated with cortical thickness and subcortical nuclei volume in PD patients. METHODS: We studied 41 non-demented PD patients. Non-motor symptoms burden was assessed using the Non-Motor Symptoms Scale grading (NMSS). Cortical thickness and subcortical nuclei volume analyses were carried out using Free-Surfer. PD patients were divided into two groups according to the NMSS grading: mild to moderate (NMSS: 0-40) and severe (NMSS: ≥ 41) non-motor symptoms. RESULTS: Thalamic atrophy was associated with higher NMSQ and NMSS total scores. The non-motor symptoms that drove this correlation were sleep/fatigue and gastrointestinal tract dysfunction. We also found that PD patients with severe non-motor symptoms had significant thalamic atrophy compared to the group with mild to moderate non-motor symptoms. CONCLUSIONS: Our findings show that greater non-motor symptom burden is associated with thalamic atrophy in PD. Thalamus plays an important role in processing sensory information including visceral afferent from the gastrointestinal tract and in regulating states of sleep and wakefulness.

Autonomic dysfunction in Alzheimer's disease: tools for assessment and review of the literature.

Autonomic dysfunction is very common in patients with dementia, and its presence might also help in differential diagnosis among dementia subtypes. Various central nervous system structures affected in Alzheimer's disease are also implicated in autonomic nervous system regulation, and it has been hypothesized that the deficit in central cholinergic function observed in Alzheimer's disease could likely lead to autonomic dysfunction. Several feasible tests can be used in clinical practice for the assessment of parasympathetic and sympathetic functions, especially in terms of cardiovascular autonomic modulation. In this review, we describe the different tests available and the evidence from the literature which indicate a definite presence of autonomic dysfunction in dementia at various degrees. Importantly, the recognition of dysautonomia, besides possibly being an early marker of dementia, would help prevent the disabling complications which increase the risk of morbidity, institutionalization, and mortality in these individuals.

Instruments for geriatric assessment: new multidimensional assessment approaches.

During the last century the considerable increase in life expectancy has led to important demographic changes and, consequently, to new clinical scenarios. Nowadays, chronic conditions, comorbidities and socio-economic factors constitute a relevant health management issue. In particular, the definition of frail elderly individuals has proven to have a strong role in the identification of high-risk patients, their clinical management and prognosis. Reorganization of the medical system has been associated with the development of new instruments for clinical assessment, focused on clinical and socio-economic issues, resulting in a multidimensional geriatric assessment. A large number of approaches have been validated in different clinical settings and populations, until the development of multidimensional instruments demonstrated to have a crucial role in the identification of frail individuals and in their clinical management. Interestingly, some of these, such as the Multidimensional Prognostic Index (MPI), proved to play a relevant role in mortality risk stratification even in particular clinical settings such as chronic kidney disease.