Impact of COVID-19 on cardiovascular testing in the United States versus the rest of the world

Objectives: This study sought to quantify and compare the decline in volumes of cardiovascular procedures between the United States and non-US institutions during the early phase of the coronavirus disease-2019 (COVID-19) pandemic. Background: The COVID-19 pandemic has disrupted the care of many non-COVID-19 illnesses. Reductions in diagnostic cardiovascular testing around the world have led to concerns over the implications of reduced testing for cardiovascular disease (CVD) morbidity and mortality. Methods: Data were submitted to the INCAPS-COVID (International Atomic Energy Agency Non-Invasive Cardiology Protocols Study of COVID-19), a multinational registry comprising 909 institutions in 108 countries (including 155 facilities in 40 U.S. states), assessing the impact of the COVID-19 pandemic on volumes of diagnostic cardiovascular procedures. Data were obtained for April 2020 and compared with volumes of baseline procedures from March 2019. We compared laboratory characteristics, practices, and procedure volumes between U.S. and non-U.S. facilities and between U.S. geographic regions and identified factors associated with volume reduction in the United States. Results: Reductions in the volumes of procedures in the United States were similar to those in non-U.S. facilities (68% vs. 63%, respectively; p = 0.237), although U.S. facilities reported greater reductions in invasive coronary angiography (69% vs. 53%, respectively; p < 0.001). Significantly more U.S. facilities reported increased use of telehealth and patient screening measures than non-U.S. facilities, such as temperature checks, symptom screenings, and COVID-19 testing. Reductions in volumes of procedures differed between U.S. regions, with larger declines observed in the Northeast (76%) and Midwest (74%) than in the South (62%) and West (44%). Prevalence of COVID-19, staff redeployments, outpatient centers, and urban centers were associated with greater reductions in volume in U.S. facilities in a multivariable analysis. Conclusions: We observed marked reductions in U.S. cardiovascular testing in the early phase of the pandemic and significant variability between U.S. regions. The association between reductions of volumes and COVID-19 prevalence in the United States highlighted the need for proactive efforts to maintain access to cardiovascular testing in areas most affected by outbreaks of COVID-19 infection

The role of silica in radiation induced grafting and crosslinking of silica/elastomer blends

When silica/polybutadiene and silica/styrene-butadiene are submitted to g irradiation at 77 K a scavenging of the silica radiolytic species by absorbed vinyl units takes place at the surface with concomitant grafting and crosslinking of the polymers. Key intermediate in such reactions are SiO2-bonded radicals of structure SiO2eC(CH3)CH(R)(R0). The role of silica is rationalized in terms of the following steps: a) absorption of the radiation energy in the bulk of the silica particles followed by exciton migration at the surface; b) reactions of excited groups (silanols) with absorbed vinyl units giving SiO2-bonded radicals; c) crosslinking of the polymers initiated by grafted radicals

The role of inorganic sulfur compounds in the pyrolysis of Kraft lignin

In this study we have evaluated the production of gas during lignin pyrolysis under static vacuum con-ditions, the quantity of the most important gases produced, and the role of sulfur compounds. In fact,sulfates can act as oxidizers at the high temperature of pyrolysis (>200◦C) increasing the amount of car-bon dioxide formed. This is related to the detection of reduced volatile sulfur compounds by GC–MS. Wehave evaluated the decrease in the production of CO2and of reduced sulfur species after a simple acidtreatment for the removal of inorganic sulfates from the pristine lignin. The thermovolumetric analysis(TVA) was found as effective as thermogravimetric (TGA) one for the investigation of lignin pyrolysis

The role of inorganic sulfur compounds in the pyrolysis of Kraft lignin

In this study we have evaluated the production of gas during lignin pyrolysis under static vacuum con-ditions, the quantity of the most important gases produced, and the role of sulfur compounds. In fact,sulfates can act as oxidizers at the high temperature of pyrolysis (>200◦C) increasing the amount of car-bon dioxide formed. This is related to the detection of reduced volatile sulfur compounds by GC–MS. Wehave evaluated the decrease in the production of CO2and of reduced sulfur species after a simple acidtreatment for the removal of inorganic sulfates from the pristine lignin. The thermovolumetric analysis(TVA) was found as effective as thermogravimetric (TGA) one for the investigation of lignin pyrolysis

Reactive carbons from Kraft lignin pyrolysis: Stabilization of peroxyl radicals at carbon/silica interface

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