Severe immune dysregulation affects CD4⁺CD25(hi)FoxP3⁺ regulatory T cells in HIV-infected patients with low-level CD4 T-cell repopulation despite suppressive highly active antiretroviral therapy.

We hypothesized that CD4(+)CD25(hi)FoxP3(+) regulatory T cells (Tregs) could be involved in the high immune activation existing in patients with low-level CD4 T-cell repopulation under suppressive high active antiretroviral therapy (hereafter, "LLR patients"). Sixteen LLR patients, 18 human immunodeficiency virus (HIV)-infected controls (hereafter, "HIV controls"), and 16 healthy subjects were included. The frequency of CD4(+)CD25(hi)FoxP3(+) and HIV-specific Treg suppressive function were assessed. Relationships between Treg and CD4/CD8 activation (HLA-DR/CD38) and the frequency of naive CD4 T-cells were assessed. Low-level patients showed a higher Treg frequency but reduced HIV-specific immunosuppressive functions than HIV controls. Whereas in healthy subjects a strong negative correlation between Tregs and activated CD8 T cells emerged (r = -0.75, P < .001), it appeared disrupted in both HIV-infected groups (r = -0.06 and P = .83 for LLR patients; r = -0.11 and P = .68 for and HIV controls). Nevertheless, in LLR patients, Tregs negatively correlated with naive CD4 T cells (r = -0.60, P = .01), whereas there was no such correlation in HIV controls (r = -0.19, P = .46) or healthy subjects (r = -0.10, P = .73). Remarkably, a higher ratio of Tregs to naive CD4 T cells was observed in LLR patients than in HIV controls (P = .001) and healthy subjects (P < .001). We conclude that LLR patients have important alterations in immunoregulation involving CD4(+)CD25(hi)FoxP3(+) Tregs. In this scenario, the role of Tregs seems to be more related to the control of the naive CD4 T-cell homeostatic proliferation, rather than to the immune activation.

Role of antiplatelet therapy in the development of intracranial bleeding after mild traumatic brain injury. / Papel de la terapia antiagregante en el desarrollo de hemorragia intracraneal tras traumatismo craneal leve.

INTRODUCTION AND OBJECTIVE: The use of antiplatelet agents is increasing, mainly in elderly patients in whom cranial trauma is a frequent reason for consultation to the emergency department. In this context, discordances have been described regarding the increased risk of post-traumatic injury that involves taking antiplatelet drugs. Therefore, the objective of this present study was to analyse factors associated with intracranial bleeding after mild brain trauma. PATIENTS AND METHODS: A retrospective study was designed that included all patients who had consulted the emergency department during 2016 because of mild brain trauma (Glasgow coma scale 14-15) and excluded patients under anticoagulant therapy. A logistic regression analysis was performed to analyse the variables associated with intracranial bleeding. RESULTS: 566 patients were included in the study. 18% of them were taking antiplatelet drugs. Tomography showed haemorrhagic intracranial damage in 16.1%. Factors associated with intracranial bleeding were: advanced age, Glasgow coma scale < 15, high-energy trauma and antiplatelet therapy. DISCUSSION: Antiplatelet therapy emerges as a risk factor for intracranial bleeding after mild head trauma, in addition to other known factors.

Respuesta: Terapia antiagregante en el traumatismo craneoencefálico leve / Reply: Antiplatelet therapy in mild head trauma

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Papel de la terapia antiagregante en el desarrollo de hemorragia intracraneal tras traumatismo craneal leve / Role of antiplatelet therapy in the development of intracranial bleeding after mild traumatic brain injury

INTRODUCCIÓN Y OBJETIVO: El uso de antiagregantes plaquetarios está aumentando, fundamentalmente en pacientes de edad avanzada en los que el traumatismo craneal es un motivo habitual de consulta en urgencias. En este contexto existe discordancia sobre el riesgo aumentado de lesión postraumática que supone la toma de antiagregantes. Por tanto, el objetivo de este estudio fue analizar los factores asociados con la presencia de sangrado intracraneal tras traumatismo craneoencefálico leve. PACIENTES Y MÉTODOS: Se diseñó un estudio retrospectivo, incluyendo todos aquellos pacientes atendidos en 2016 por traumatismo craneoencefálico leve (escala de coma de Glasgow 14-15), excluyendo los pacientes en tratamiento anticoagulante. Se realizó un análisis de regresión logística para analizar las variables asociadas con sangrado intracraneal. RESULTADOS: Quinientos sesenta y seis pacientes fueron incluidos. El 18% de los pacientes tomaba antiagregantes. La tomografía mostró lesión intracraneal hemorrágica en el 16,1%. Los factores asociados con sangrado intracraneal fueron: edad avanzada, escala de coma Glasgow<15, traumatismo de alta energía y toma de antiagregantes. DISCUSIÓN: La terapia antiagregante emerge como factor de riesgo de sangrado intracraneal tras traumatismo craneoencefálico leve, además de otros factores ya conocidos

Introduction and OBJECTIVE: The use of antiplatelet agents is increasing, mainly in elderly patients in whom cranial trauma is a frequent reason for consultation to the emergency department. In this context, discordances have been described regarding the increased risk of post-traumatic injury that involves taking antiplatelet drugs. Therefore, the objective of this present study was to analyse factors associated with intracranial bleeding after mild brain trauma. PATIENTS AND METHODS: A retrospective study was designed that included all patients who had consulted the emergency department during 2016 because of mild brain trauma (Glasgow coma scale 14-15) and excluded patients under anticoagulant therapy. A logistic regression analysis was performed to analyse the variables associated with intracranial bleeding. RESULTS: 566 patients were included in the study. 18% of them were taking antiplatelet drugs. Tomography showed haemorrhagic intracranial damage in 16.1%. Factors associated with intracranial bleeding were: advanced age, Glasgow coma scale < 15, high-energy trauma and antiplatelet therapy. DISCUSSION: Antiplatelet therapy emerges as a risk factor for intracranial bleeding after mild head trauma, in addition to other known factors