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BACKGROUND: There was a reported increase in the antimicrobial consumption in hospitals during the COVID-19 pandemic, accompanied by an increase in infections due to multidrug-resistant (MDR) bacteria. METHODS: This retrospective time series study from intensive care units in Buenos Aires examined changes in antibiotic consumption (defined daily doses/1000 patients/day), the incidence of Gram-negative bacilli (GNB) and the mechanism of resistance. Antibiotics were categorised into group 1 (agents against MDR GNB) and group 2 (agents against non-MDR infections). Bacteriological samples included respiratory samples and blood cultures. Periods were divided into pre-pandemic (July 2019 to March 2020) and pandemic (April 2020 to March 2022). Correlation coefficients (r) were analysed and the Mann-Whitney test was performed to compare both periods. RESULTS: During the study period, GNB incidence, group 1 antibiotic consumption and resistance mechanisms increased, whereas antibiotics decreased in group 2. A significant positive correlation was seen between the consumption of antibiotics in group 1 and the incidence of GNB (r = 0.63; P < 0.001) and resistance (r = 0.52; P = 0.002). Significant differences were found between pre-pandemic and pandemic periods regarding the medians of group 1 consumption (520 [408-570] vs. 753 [495-851] DDD/1000 patients/day; P = 0.029), incidence of GNB (12 [10-13] vs. 43 [25-52.5] cases/month; P < 0.001) and resistance mechanisms (5 [4-8] vs. 17 [10-25] cases/month; P < 0.001), extended-spectrum beta lactamases (2 [1-2] vs. 6 [3-8] cases/month; P < 0.001) and metallo-beta-lactamases (0 [0-0] vs. 6 [1.75-8.5] cases/month; P < 0.001). CONCLUSION: During the COVID-19 pandemic, the rise in GNB incidence and the amount of resistance mechanisms significantly correlated with the increase in consumption of agents against MDR strains.

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La criptococosis es la micosis sistémica más frecuente entre los pacientes con HIV SIDA. Su prevalencia oscila entre el 5% y el 25%, de acuerdo con la región geográfica que se considere. La localización habitual de esta micosis en el paciente VIH es el sistema nervioso central (SNC). La diseminación sanguínea del agente causal ocurre ante defectos de la inmunidad mediada por células, asociándose con frecuencia a linfomas, leucemia, enfermedades del sistema retículo endotelial. A partir de la eclosión del HIV se redujo un aumento significativo del número de casos, transformándose esta última condición en la causa favorecedora más importante.

Cryptococcosis is the most frequent systemic mycosis among patients with HIV AIDS. Its prevalence ranges between 5% and 25%, according to the geographical region considered. The usual location of this mycosis in the HIV patient is the central nervous system (CNS). Blood dissemination of the causative agent occurs due to defects of cell-mediated immunity, frequently associated with lymphomas, leukemia, reticuloendothelial system diseases. From the emergence of HIV, there was a significant increase in the number of cases, with the latter condition becoming the most important favorable cause

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El objetivo del trabajo fue describir un caso de linfoma esplénico de zona marginal (LEZM) con un componente monoclonal que posee propiedades de crioglobulina y crioaglutinina, un hallazgo de muy baja frecuencia. Una paciente con LEZM padeció una anemia hemolítica autoinmune 5 años después del diagnóstico, con hematocrito de 0,15 L/L, hemoglobina 49 g/L, lactato deshidrogenasa 16,82 μkat/L, prueba de Coombs directa positiva con anti- IgG/C3d, bilirrubina total 90,6 μmol/L e indirecta de 58,1 μmol/L. No presentó evidencia clínica ni serológica de infección por VIH, hepatitis B ni C. El proteinograma sérico presentó un pico monoclonal de 14 g/L, con crioglobulinemia positiva a las 24 h, y un criocrito de 30%. La crioglobulina purificada fue de tipo I con un componente monoclonal IgM-lambda, coincidente al observado en suero. El suero, el eluato a 37 °C y la crioglobulina purificada de la paciente presentaron actividad de crioaglutinina con especificidad anti-I, fenómeno producido por la misma inmunoglobulina. El hallazgo de una crioglobulina con propiedades de crioaglutinina en pacientes con LEZM no ha sido descrito previamente en la bibliografía.

The aim of this paper is to describe a case of splenic marginal zone lymphoma (SMZL) with monoclonal component having properties of cryoglobulin and cold agglutinin, a finding of very low frequency. A patient with SMZL suffered autoimmune hemolytic anemia five years after diagnosis, with hematocrit 0.15 L/L, hemoglobin 49 g/L, lactate dehydrogenase 16.82 μkat/L, direct Coombs test with anti-IgG/C3d positive, total bilirubin 90.6 μmol/L and indirect 58.1 μmol/L. She presented no clinical or serological evidence of HIV, hepatitis B or C infection. Serum protein electrophoresis showed a monoclonal peak of 14 g/L, with positive cryoglobulinemia at 24 hours, and 30% cryocrit. Purified cryoglobulin was type I with a monoclonal IgM-lambda component coincident with that observed in serum. The patient serum, eluate at 37 °C and purified cryoglobulin showed cold agglutinin activity with anti-I specificity, phenomenon produced by the same immunoglobulin. The finding of a cryoglobulin with cold agglutinin properties in patients with SMZL has not been previously described in the literature.

O objetivo do trabalho foi descrever um caso de linfoma esplênico de zona marginal (LEZM) com um componente monoclonal com propriedades do crioglobulina e crioaglutinina, um achado de muito baixa frequência. Um doente com LEZM sofreu uma anemia hemolítica autoimune cinco anos após o diagnóstico, com hematócrito de 0,15 L/L, hemoglobina 49 g/L, lactato desidrogenase de 16,82 μkat/L, teste de Coombs direto positivo com anti-IgG/C3d, bilirrubina total 90,6 μmol/L e indireta 58,1 μmol/L. Não apresentou evidência clínica ou sorológica de infecção por HIV, hepatite B ou C. O proteinograma sérico mostrou um pico monoclonal de 14 g/L, com crioglobulinemia positiva 24 horas, e um criocrito de 30%. Crioglobulina purificada foi tipo I com o componente monoclonal IgM-lambda, coincidente com a observada no soro. O soro, o eluato a 37 ° C e a crioglobulina purificada do paciente mostraram atividade de crioaglutinina com especificidade anti-I, fenômeno produzido pela mesma imunoglobulina. O achado de uma crioglobulina com propriedades de crioaglutinina em pacientes com LEZM não foi previamente descrito na literatura.

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OBJECTIVE: Fetal and postnatal zinc deficiencies induce an increase in arterial blood pressure and impair renal function in male adult rats. We therefore hypothesized that these renal alterations are present in early stages of life and that there are sexual differences in the adaptations to this nutritional injury. The aim was to study the effects of moderate zinc deficiency during fetal life and lactation on renal morphology, oxidative stress, apoptosis, and the nitric oxide system in male and female rats at 21 d of life. METHODS: Female Wistar rats received low (8 ppm) or control (30 ppm) zinc diets from the beginning of pregnancy to weaning. Glomerulus number, morphology, oxidative stress, apoptotic cells, nitric oxide synthase activity, and protein expression were evaluated in the kidneys of offspring at 21 d. RESULTS: Zinc deficiency decreased the nephron number, induced glomerular hypertrophy, increased oxidative damage, and decreased nitric oxide synthase activity in the male and female rat kidneys. Nitric oxide synthase activity was not affected by inhibitors of the neuronal or inducible isoforms, so nitric oxide was mainly generated by the endothelial isoenzyme. Gender differences were observed in glomerular areas and antioxidant enzyme activities. CONCLUSION: Zinc deficiency during fetal life and lactation induces an early decrease in renal functional units, associated with a decrease in nitric oxide activity and an increase in oxidative stress, which would contribute to increased arterial blood pressure and renal dysfunction in adulthood. The sexual differences observed in this model may explain the dissimilar development of hypertension and renal diseases in adult life.

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Introducción Numerosos estudios sugieren que trastornos metabólicos y desequilibrios nutricionales durante la vida intrauterina pueden inducir adaptaciones que programen enfermedades cardiovasculares e hipertensión arterial. En trabajos previos mostramos que la restricción moderada de cinc durante la vida fetal, la lactancia y/o el crecimiento conduce al desarrollo de hipertensión arterial y disfunción renal en la adultez. Objetivos Evaluar la presencia de alteraciones cardiovasculares tempranas en ratas sometidas a una deficiencia moderada de cinc durante la vida fetal y la lactancia y si existen diferencias respecto del sexo. Material y métodos Ratas Wistar hembras recibieron durante la preñez hasta el destete una dieta control o baja en cinc. En el momento del nacimiento se conformaron cuatro grupos experimentales: machos y hembras nacidos de madres bajas y machos y hembras nacidos de madres controles. A los 6 y a los 21 días de vida se sacrificaron y se determinaron el peso corporal, el peso del corazón, parámetros morfométricos cardiovasculares, la actividad de la óxido nítrico sintasa en el sistema cardiovascular y el estado oxidativo cardíaco. Resultados El aporte insuficiente de cinc durante la vida fetal y la lactancia indujo un proceso de re­modelación del cardiomiocito, diferente en machos que en hembras, un aumento del estrés oxidativo cardíaco, una remodelación hipotrófica de la aorta torácica y una disminución de la actividad de la óxido nítrico sintasa en el sistema cardiovascular. Conclusiones Este trabajo demuestra que la deficiencia de cinc induce alteraciones cardiovasculares, dis­tintas en machos que en hembras, tempranas en el desarrollo, que podrían contribuir a la programación de enfermedades en la vida adulta.

Background Several studies suggest that metabolic disorders and nutrition imbalance during prenatal life may induce adaptations that program cardiovascular diseases and hypertension. We have previously shown that moderate zinc restriction during prenatal life, lactation and/or growth leads to the development of hypertension and renal dysfunction in adulthood. Objectives To evaluate the presence of early cardiovascular alterations in rats exposed to a moderate zinc deficient diet during pre­natal life and lactation, and to determine whether there are differences between males and females. Material and Methods Female Wistar rats received low zinc diet or control diet from the beginning of pregnancy up to weaning. Four experimental groups were established at birth: males and females born from low-diet mothers, and males and females born from control-diet mothers. Male and female offspring were sacrificed at 6 and 21 days of life to evaluate body weight, heart weight, cardiovascular morphometric parameters and nitric oxide synthase activity in the cardiovascular system and cardiac oxidative status. Results The insufficient zinc intake during prenatal life and lacta-tion induced a remodeling process of the cardiomyocyte which was different in males and females, increased cardiac oxidative stress, produced a hypotrophic remodeling of the thoracic aorta and reduced nitric oxide synthase activity in the cardiovascular system. Conclusions This study shows that zinc deficiency induces cardiovascular abnormalities in early stages of development, which are different in males and females that may contribute to programming of diseases in adulthood.