Effects of annual influenza vaccination on mortality in patients with heart failure.

The objective was to evaluate the effect of influenza vaccine on all-cause mortality in a cohort of patients with heart failure followed up in primary care centres of the Community of Madrid, Spain, during the period 2006-10. Results of the Cox proportional-hazard model were adjusted for age and sex and, after 1:1 nearest neighbour matching, for propensity score. The analysis was further stratified by season. Having received annual influenza vaccine was associated with a decreased risk of death during the influenza season (hazard ratio = 0.59, 95% CI = 0.41-0.84), but no protective effect was observed before or after the influenza season.

Evaluation of the effect of hospitalization on mortality in patients with heart failure followed in primary care.

Background: Heart failure (HF) is a serious health-care problem. The aim of this study is to evaluate the effect of the first acute episode of decompensated HF that requires a hospitalization on the survival of newly diagnosed cases of HF with follow-up for 5 years in primary care (PC). Methods: This was a longitudinal observational study of a retrospective cohort of patients with information extracted from electronic medical records of PC. Incident cases of HF from 2006 to 2010 or until death were studied through a survival analysis with Kaplan-Meier and Cox proportional hazards multivariate regression, after applying the propensity score matching technique (PSM). Results: A total of 3061 new cases of HF were identified. The PSM analysis was performed with 529 couples, with a total of 1058 patients. 5-year survival was 65% in no hospitalized and 53% in hospitalized patients. Factors with an increased risk of mortality were having prescribed nitrates (heart rate [HR] = 1.56; 1.08-2.24). Factors with protective effect were having received the annual influenza vaccine (HR = 0.04; 0.01-0.15) and having been indicated X-rays by PC physician (HR = 0.76; 0.67-0.88). Conclusions: The findings indicate that hospitalizations are associated with a significant increase in mortality in patients recently diagnosed with HF. It is important to reinforce the need for the prevention of acute decompensated HF and for strategies to improve post-discharge outcomes.

Antecedentes: La insuficiencia cardiaca (IC) es un serio problema de asistencia médica. El objetivo de este estudio es evaluar el efecto del primer episodio de IC aguda descompensada que requiere una hospitalización en la supervivencia de los casos de IC recientemente diagnosticados con un seguimiento de 5 años en Atención Primaria (AP). Métodos: Estudio observacional longitudinal de una cohorte retrospectiva de pacientes con información extraída de la historia clínica electrónica de AP. Se estudiaron los casos incidentes de IC desde 2006 a 2010 o hasta su fallecimiento con un análisis de supervivencia de Kaplan-Meier y un modelo de regresión de Cox, después de aplicar la técnica del Propensity Score Matching (PSM). Resultados: Se identificaron 3.061 casos nuevos de IC. El análisis PSM se realizó con 529 pareja, con un total de 1.058 pacientes. La supervivencia a los cinco años fue del 65% en pacientes no hospitalizados y del 53% en pacientes hospitalizados. Los factores con mayor riesgo de mortalidad fueron tener prescritos nitratos (HR = 1,56; 1,08-2,24). Los factores con efecto protector fueron haber recibido la vacuna anual de la gripe (HR = 0,04; 0,01-0,15) y haber sido indicadas radiografías por el médico de AP (HR = 0,76; 0,67-0,88). Conclusiones: Los hallazgos indican que las hospitalizaciones se asocian con un aumento significativo de la mortalidad en pacientes diagnosticados recientemente con IC. Es importante reforzar la necesidad de prevenir la IC descompensada aguda y las estrategias para mejorar los resultados posteriores al alta.

Evaluation of the effect of hospitalization on mortality in patients with heart failure followed in primary care.

Background: Heart failure (HF) is a serious health-care problem. The aim of this study is to evaluate the effect of the first acute episode of decompensated HF that requires a hospitalization on the survival of newly diagnosed cases of HF with follow-up for 5 years in primary care (PC). Methods: This was a longitudinal observational study of a retrospective cohort of patients with information extracted from electronic medical records of PC. Incident cases of HF from 2006 to 2010 or until death were studied through a survival analysis with Kaplan-Meier and Cox proportional hazards multivariate regression, after applying the propensity score matching technique (PSM). Results: A total of 3061 new cases of HF were identified. The PSM analysis was performed with 529 couples, with a total of 1058 patients. 5-year survival was 65% in no hospitalized and 53% in hospitalized patients. Factors with an increased risk of mortality were having prescribed nitrates (heart rate [HR] = 1.56; 1.08-2.24). Factors with protective effect were having received the annual influenza vaccine (HR = 0.04; 0.01-0.15) and having been indicated X-rays by PC physician (HR = 0.76; 0.67-0.88). Conclusions: The findings indicate that hospitalizations are associated with a significant increase in mortality in patients recently diagnosed with HF. It is important to reinforce the need for the prevention of acute decompensated HF and for strategies to improve post-discharge outcomes.

Antecedentes: La insuficiencia cardiaca (IC) es un serio problema de asistencia médica. El objetivo de este estudio es evaluar el efecto del primer episodio de IC aguda descompensada que requiere una hospitalización en la supervivencia de los casos de IC recientemente diagnosticados con un seguimiento de 5 años en Atención Primaria (AP). Métodos: Estudio observacional longitudinal de una cohorte retrospectiva de pacientes con información extraída de la historia clínica electrónica de AP. Se estudiaron los casos incidentes de IC desde 2006 a 2010 o hasta su fallecimiento con un análisis de supervivencia de Kaplan-Meier y un modelo de regresión de Cox, después de aplicar la técnica del Propensity Score Matching (PSM). Resultados: Se identificaron 3.061 casos nuevos de IC. El análisis PSM se realizó con 529 pareja, con un total de 1.058 pacientes. La supervivencia a los cinco años fue del 65% en pacientes no hospitalizados y del 53% en pacientes hospitalizados. Los factores con mayor riesgo de mortalidad fueron tener prescritos nitratos (HR = 1,56; 1,08-2,24). Los factores con efecto protector fueron haber recibido la vacuna anual de la gripe (HR = 0,04; 0,01-0,15) y haber sido indicadas radiografías por el médico de AP (HR = 0,76; 0,67-0,88). Conclusiones: Los hallazgos indican que las hospitalizaciones se asocian con un aumento significativo de la mortalidad en pacientes diagnosticados recientemente con IC. Es importante reforzar la necesidad de prevenir la IC descompensada aguda y las estrategias para mejorar los resultados posteriores al alta.

Longitudinal variation in human immunodeficiency virus long terminal repeat methylation in individuals on suppressive antiretroviral therapy.

BACKGROUND: Persistence of latent, replication-competent provirus in CD4+ T cells of human immunodeficiency virus (HIV)-infected individuals on antiretroviral treatment (ART) is the main obstacle for virus eradication. Methylation of the proviral 5' long terminal repeat (LTR) promoter region has been proposed as a possible mechanism contributing to HIV latency; however, conflicting observations exist regarding its relevance. We assessed 5'-LTR methylation profiles in total CD4+ T cells from blood of 12 participants on short-term ART (30 months) followed up for 2 years, and a cross-sectional group of participants with long-term ART (6-15 years), using next generation sequencing. We then looked for associations between specific 5'-LTR methylation patterns and baseline and follow-up clinical characteristics. RESULTS: 5'-LTR methylation was observed in all participants and behaved dynamically. The number of 5'-LTR variants found per sample ranged from 1 to 13, with median sequencing depth of 16270× (IQR 4107×-46760×). An overall significant 5'-LTR methylation increase was observed at month 42 compared to month 30 (median CpG Methylation Index: 74.7% vs. 0%, p = 0.025). This methylation increase was evident in a subset of participants (methylation increase group), while the rest maintained fairly high and constant methylation (constant methylation group). Persons in the methylation increase group were younger, had higher CD4+ T cell gain, larger CD8% decrease, and larger CD4/CD8 ratio change after 48 months on ART (all p < 0.001). Using principal component analysis, the constant methylation and methylation increase groups showed low evidence of separation along time (factor 2: p = 0.04). Variance was largely explained (21%) by age, CD4+/CD8+ T cell change, and CD4+ T cell subpopulation proportions. Persons with long-term ART showed overall high methylation (median CpG Methylation Index: 78%; IQR 71-87%). No differences were observed in residual plasma viral load or proviral load comparing individuals on short-term (both at 30 or 42 months) and long-term ART. CONCLUSIONS: Our study shows evidence that HIV 5'-LTR methylation in total CD4+ T cells is dynamic along time and that it can follow different temporal patterns that are associated with a combination of baseline and follow-up clinical characteristics. These observations may account for differences observed between previous contrasting studies.

Epidemiology and clinical characteristics of respiratory syncytial virus infections among children and adults in Mexico.

BACKGROUND: Respiratory syncytial virus (RSV) is a leading etiological agent of acute respiratory tract infections and hospitalizations in children. However, little information is available regarding RSV infections in Latin American countries, particularly among adult patients. OBJECTIVE: To describe the epidemiology of RSV infection and to analyze the factors associated with severe infections in children and adults in Mexico. METHODS: Patients ≥1 month old, who presented with an influenza-like illness (ILI) to six hospitals in Mexico, were eligible for participation in the study. Multiplex reverse-transcriptase polymerase chain reaction identified viral pathogens in nasal swabs from 5629 episodes of ILI. Patients in whom RSV was detected were included in this report. RESULTS: Respiratory syncytial virus was detected in 399 children and 171 adults. RSV A was detected in 413 cases and RSV B in 163, including six patients who had coinfection with both subtypes; 414 (72.6%) patients required hospital admission, including 96 (16.8%) patients that required admission to the intensive care unit. Coinfection with one or more respiratory pathogens other than RSV was detected in 159 cases. Young age (in children) and older age (in adults) as well as the presence of some underlying conditions were associated with more severe disease. CONCLUSIONS: This study confirms that RSV is an important respiratory pathogen in children in Mexico. In addition, a substantial number of cases in adults were also detected highlighting the relevance of this virus in all ages. It is important to identify subjects at high risk of complications who may benefit from current or future preventive interventions.

Evaluation of the effect of hospitalization on mortality in patients with heart failure followed in primary care / Evaluación del efecto de las hospitalizaciones sobre mortalidad en pacientes con Insuficiencia cardíaca seguidos en atención primaria

Abstract Background: Heart failure (HF) is a serious health-care problem. The aim of this study is to evaluate the effect of the first acute episode of decompensated HF that requires a hospitalization on the survival of newly diagnosed cases of HF with follow-up for 5 years in primary care (PC). Methods: This was a longitudinal observational study of a retrospective cohort of patients with information extracted from electronic medical records of PC. Incident cases of HF from 2006 to 2010 or until death were studied through a survival analysis with Kaplan–Meier and Cox proportional hazards multivariate regression, after applying the propensity score matching technique (PSM). Results: A total of 3061 new cases of HF were identified. The PSM analysis was performed with 529 couples, with a total of 1058 patients. 5-year survival was 65% in no hospitalized and 53% in hospitalized patients. Factors with an increased risk of mortality were having prescribed nitrates (heart rate [HR] = 1.56; 1.08-2.24). Factors with protective effect were having received the annual influenza vaccine (HR = 0.04; 0.01-0.15) and having been indicated X-rays by PC physician (HR = 0.76; 0.67-0.88). Conclusions: The findings indicate that hospitalizations are associated with a significant increase in mortality in patients recently diagnosed with HF. It is important to reinforce the need for the prevention of acute decompensated HF and for strategies to improve post-discharge outcomes.

Resumen Antecedentes: La insuficiencia cardiaca (IC) es un serio problema de asistencia médica. El objetivo de este estudio es evaluar el efecto del primer episodio de IC aguda descompensada que requiere una hospitalización en la supervivencia de los casos de IC recientemente diagnosticados con un seguimiento de 5 años en Atención Primaria (AP). Métodos: Estudio observacional longitudinal de una cohorte retrospectiva de pacientes con información extraída de la historia clínica electrónica de AP. Se estudiaron los casos incidentes de IC desde 2006 a 2010 o hasta su fallecimiento con un análisis de supervivencia de Kaplan-Meier y un modelo de regresión de Cox, después de aplicar la técnica del Propensity Score Matching (PSM). Resultados: Se identificaron 3.061 casos nuevos de IC. El análisis PSM se realizó con 529 pareja, con un total de 1.058 pacientes. La supervivencia a los cinco años fue del 65% en pacientes no hospitalizados y del 53% en pacientes hospitalizados. Los factores con mayor riesgo de mortalidad fueron tener prescritos nitratos (HR = 1,56; 1,08-2,24). Los factores con efecto protector fueron haber recibido la vacuna anual de la gripe (HR = 0,04; 0,01-0,15) y haber sido indicadas radiografías por el médico de AP (HR = 0,76; 0,67-0,88). Conclusiones: Los hallazgos indican que las hospitalizaciones se asocian con un aumento significativo de la mortalidad en pacientes diagnosticados recientemente con IC. Es importante reforzar la necesidad de prevenir la IC descompensada aguda y las estrategias para mejorar los resultados posteriores al alta.

Respuesta de los autores: Diferencias en la supervivencia en pacientes con insuficiencia cardiaca / Author’s reply: Differences in survival in heart failure patients

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