The last several years have seen intense debate about the issue of transitioning between standard and daylight saving time. In the United States, the annual advance to daylight saving time in spring, and fall back to standard time in autumn, is required by law (although some exceptions are allowed under the statute). An abundance of accumulated evidence indicates that the acute transition from standard time to daylight saving time incurs significant public health and safety risks, including increased risk of adverse cardiovascular events, mood disorders, and motor vehicle crashes. Although chronic effects of remaining in daylight saving time year-round have not been well studied, daylight saving time is less aligned with human circadian biology-which, due to the impacts of the delayed natural light/dark cycle on human activity, could result in circadian misalignment, which has been associated in some studies with increased cardiovascular disease risk, metabolic syndrome and other health risks. It is, therefore, the position of the American Academy of Sleep Medicine that these seasonal time changes should be abolished in favor of a fixed, national, year-round standard time.
Hypoxemic respiratory failure is a common manifestation of COVID-19 pneumonia. Early in the COVID-19 pandemic, patients with hypoxemic respiratory failure were, at times, being intubated earlier than normal; in part because the options of heated humidified high flow nasal cannula (HFNC) and non-invasive ventilation (NIV) were considered potentially inadequate and to increase risk of virus aerosolization. To understand the benefits and factors that predict success and failure of HFNC in this population, we evaluated data from the first 30 sequential patients admitted with COVID-19 pneumonia to our center who were managed with HFNC. We conducted Cox Proportional Hazards regression models to evaluate the factors associated with high flow nasal cannula failure (outcome variable), using time to intubation (censoring variable), while adjusting for comorbidities and immunosuppression. In the majority of our patients (76.7%), the use of HFNC failed and the patients were ultimately placed on mechanical ventilation. Those at increased risk of failure had a higher sequential organ failure assessment score, and at least one comorbidity or history of immunosuppression. Our data suggest that high flow nasal cannula may have a role in some patients with COVID-19 presenting with hypoxemic respiratory failure, but careful patient selection is the likely key to its success.
Introducción. La infección por el nuevo coronavirus SARS-Cov-2 es una emergencia de salud pública en todo el mundo; su diagnóstico se basa en pruebas moleculares, en tanto que su pronóstico depende de los antecedentes del paciente y de algunos exámenes paraclínicos. En Colombia aún no se cuenta con datos de pronóstico en una población local.Objetivo. Evaluar los factores asociados con el desarrollo de la enfermedad grave en pacientes hospitalizados con diagnóstico de infección por SARS-CoV-2, así como los factores pronósticos de la mortalidad.Materiales y métodos. Se hizo un estudio de cohorte ambispectivo en pacientes hospitalizados en la Fundación Cardioinfantil entre marzo y junio de 2020.Resultados. De los 104 pacientes analizados, en el 31,7 % (n=33) la infección fue grave y en el 9,6 % (n=10) se produjo la muerte. El factor pronóstico más importante de la mortalidad fue el desarrollo de la enfermedad grave, seguido de una edad de más de 60 años y la desnutrición. Para el desarrollo de la enfermedad grave los factores pronósticos fueron los antecedentes de hemodiálisis (hazard ratio, HR=135), diabetes (HR=4,4) y el aumento en el nivel de la lactato deshidrogenasa (LDH) (HR=1,004), en tanto que un conteo de linfocitos superior a 1.064 fue un factor protector (HR=0,9). El puntaje del National Early Warning Score (NEWS2) correspondiente a las categorías de alto y bajo riesgo fue el que mejor rendimiento tuvo. No hubo diferencia entre los tratamientos administrados.Conclusiones. Los factores pronósticos más importantes para la mortalidad fueron tener más de 60 años, hipertensión, diabetes y cirrosis, en tanto que para el desarrollo de la enfermedad grave fueron la enfermedad renal crónica con hemodiálisis, un puntaje de NEWS2 de alto riesgo al ingreso, y aumento en los niveles de LDH y proteína C reactiva, y leucocitosis.
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