Early detection of Parkinson's disease: Systematic analysis of the influence of the eyes on quantitative biomarkers in resting state electroencephalography.

While resting state electroencephalography (EEG) provides relevant information on pathological changes in Parkinson's disease, most studies focus on the eyes-closed EEG biomarkers. Recent evidence has shown that both eyes-open EEG and reactivity to eyes-opening can also differentiate Parkinson's disease from healthy aging, but no consensus has been reached on a discriminatory capability benchmark. The aim of this study was to determine the resting-state EEG biomarkers suitable for real-time application that can differentiate Parkinson's patients from healthy subjects under both eyes closed and open. For this, we analysed and compared the quantitative EEG analyses of 13 early-stage cognitively normal Parkinson's patients with an age and sex-matched healthy group. We found that Parkinson's disease exhibited abnormal excessive theta activity in eyes-closed, which was reflected by a significantly higher relative theta power, a higher time percentage with a frequency peak in the theta band and a reduced alpha/theta ratio, while Parkinson's patients showed a significantly steeper non-oscillatory spectral slope activity than that of healthy subjects. We also found considerably less alpha and beta reactivity to eyes-opening in Parkinson's disease plus a significant moderate correlation between these EEG-biomarkers and the MDS-UPDRS score, used to assesses the clinical symptoms of Parkinson's Disease. Both EEG recordings with the eyes open and reactivity to eyes-opening provided additional information to the eyes-closed condition. We thus strongly recommend that both eyes open and closed be used in clinical practice recording protocols to promote EEG as a complementary non-invasive screening method for the early detection of Parkinson's disease, which would allow clinicians to design patient-oriented treatment and improve the patient's quality of life.

[Rapidly progressive dementia as the initial presentation of human immunodeficiency virus infection].

Dementia associated with human immunodeficiency virus (HIV) is currently a rare cause of rapidly progressive dementia. Its appearance is not only limited to the late phases of the disease, but can sometimes be the presenting symptom. We present the case of a patient who debuted with anxious-depressive symptoms and rapid cognitive deteri-oration with early repercussions on his daily functionality. HIV was detected in the study, with a higher viral load in cerebrospinal fluid than in plasma. Despite a torpid course at the beginning, antiretroviral therapy brought about a progressive improvement in the cognitive sphere, consistent with the decrease in the viral load. Although rare, HIV continues to be a cause of dementia that primary care and hospital care professionals should not forget. The relevance of its early diagnosis lies in its potentially reversible nature.