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<b><i>Introduction:</i></b> Cerebrospinal fluid (CSF) biomarker quantification provides physicians with a reliable diagnosis of Alzheimer’s disease (AD). However, the relationship between their concentration and disease course has not been clearly elucidated. This work aimed to investigate the clinical and prognostic significance of Aβ₄₀ CSF levels. <b><i>Methods:</i></b> A retrospective cohort of 76 patients diagnosed with AD using a decreased Aβ₄₂/Aβ₄₀ ratio was subclassified into hyposecretors (Aβ₄₀ &lt;7,755 pg/mL), normosecretors (Aβ₄₀ 7,755–16,715 pg/mL), and hypersecretors (Aβ₄₀ &gt;16,715 pg/mL). Potential differences in AD phenotype, Montreal Cognitive Assessment (MoCA) scores, and Global Deterioration Scale (GDS) stages were assessed. Correlation tests for biomarker concentrations were also performed. <b><i>Results:</i></b> Participants were classified as hyposecretors (<i>n</i> = 22, median Aβ₄₀ 5,870.500 pg/mL, interquartile range [IQR] 1,431), normosecretors (<i>n</i> = 47, median Aβ₄₀ 10,817 pg/mL, IQR 3,622), and hypersecretors (<i>n</i> = 7, 19,767 pg/mL, IQR 3,088). The distribution of positive phosphorylated Tau (p-Tau) varied significantly between subgroups and was more common in the normo- and hypersecretor categories (<i>p</i> = 0.003). Aβ₄₀ and p-Tau concentrations correlated positively (ρ = 0.605, <i>p</i> &lt; 0.001). No significant differences were found among subgroups regarding age, initial MoCA score, initial GDS stage, progression to the dementia stage, or changes in the MoCA score. <b><i>Conclusion:</i></b> In this study, we found no significant differences in clinical symptoms or disease progression in AD patients according to their CSF Aβ₄₀ concentration. Aβ₄₀ was positively correlated with p-Tau and total Tau concentrations, supporting their potential interaction in AD pathophysiology.

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Objective: Posterior reversible encephalopathy syndrome (PRES) has been robustly associated with preeclampsia, hyperperfusion or endothelial dysfunction suggested as possible mechanisms. In this article, we report an illustrative case of this complication in a patient with risk factors for hypertensive disorders in pregnancy, including advanced maternal age and donor oocyte fertilization. Case report: We present a case of a 40-year-old pregnant, donor oocyte recipient with sudden decreased visual acuity accompanied by hypertension, proteinuria and tonic-clonic seizures. Magnetic resonance imaging (MRI) of the brain showed bilateral lesions in the parieto-occipital regions suggestive of vasogenic edema, leading us to suspect posterior reversible encephalopathy syndrome. The patient underwent an emergency cesarean section and labetalol and magnesium sulfate were administered intravenously. The neurological symptoms and radiological findings resolved following delivery and the patient’s blood pressure normalized, supporting the diagnosis of posterior reversible encephalopathy syndrome. Conclusion: Pregnancy by donor oocyte fertilization may entail a higher risk of eclampsia and associated posterior reversible encephalopathy syndrome.