New perspectives on natural flavonoids on COVID-19-induced lung injuries.

The SARS-CoV-2 virus, responsible for COVID-19, spread rapidly worldwide and became a pandemic in 2020. In some patients, the virus remains in the respiratory tract, causing pneumonia, respiratory failure, acute respiratory distress syndrome (ARDS), and sepsis, leading to death. Natural flavonoids (aglycone and glycosides) possess broad biological activities encompassing antiinflammatory, antiviral, antitumoral, antiallergic, antiplatelet, and antioxidant effects. While many studies have focused on the effects of natural flavonoids in experimental models, reports based on clinical trials are still insufficient. In this review, we highlight the effects of flavonoids in controlling pulmonary diseases, particularly the acute respiratory distress syndrome, a consequence of COVID-19, and their potential use in coronavirus-related diseases. Furthermore, we also focus on establishing a relationship between biological potential and chemical aspects of related flavonoids and discuss several possible mechanisms of action, pointing out some possible effects on COVID-19.

Cyanoacrylate embolization following egd resulting in fulminant hepatic failure in a patient with cirrhosis

INTRODUCTION: Esophagogastric varices are a common complication of portal hypertension and can present with life-threatening bleeding. Definitive endoscopic therapy is via band ligation or sclerotherapy. The former is preferred for esophageal varices, but efficacy is lower in gastric varices (GV). Sclerotherapy with cyanoacrylate (CA) has shown better efficacy and is now recommended as first line therapy for bleeding GV. Studies on long-term efficacy and complications remain limited. CASE DESCRIPTION/METHODS: A 62-year-old woman with NASH cirrhosis (MELD 11) presented with hematemesis. She denied any history of SBP, varices, or encephalopathy. She endorsed a previous history of COVID-19 and had reactive IgG but PCR probe for SARS-CoV-2 was negative. She underwent EGD and was found to have oozing GV along the lesser curvature, which were treated with 4cc of CA achieving hemostasis. The following night she had altered mentation and the blood lactate was increased to 7.2 mmol/L. AST and ALT were also increased. She received broad spectrum antibiotics, and a CT angiogram showed evidence of embolization of CA into the left lobe of the liver. On day 3 her level of consciousness declined and she was intubated for airway compromise. An MRCP confirmed the presence of CA within the left hepatic lobe with associated ischemia. The lactate increased to 20 mmol/L and the blood ammonia level to 700 mcg/dL, with MELD 45. Continuous hemodialysis was started for anuric renal failure. She underwent evaluation for liver transplantation, but cerebral edema and multiorgan failure with refractory acidosis occurred and she died on day 7. DISCUSSION: We present a case of GV treated with CA and the subsequent embolization of CA into the left lobe of the liver. This precipitated acute on chronic liver failure with features of fulminant hepatic failure (FHF) complicated by severe hyperammonemia, cerebral edema, multiorgan failure, and death. Although she had a recent diagnosis of COVID-19, the time course, relatively normal initial inflammatory markers, and imaging suggest that CA embolization was likely the injury that led to fulminant hepatic failure. Given the lack of case reports of CA embolization to the liver causing infarction and few cases to the brain or distant vessels, further research on its long-term safety is warranted. Another novel aspect to this case is the development of FHF in a patient with known cirrhosis.

An influenza A (H3N2) virus outbreak in the Kingdom of Cambodia during the COVID-19 pandemic of 2020.

BACKGROUND: Global influenza virus circulation decreased during the COVID-19 pandemic, possibly due to widespread community mitigation measures. Cambodia eased some COVID-19 mitigation measures in June and July 2020. On 20 August a cluster of respiratory illnesses occurred among residents of a pagoda, including people who tested positive for influenza A but none who were positive for SARS-CoV-2. METHODS: A response team was deployed on 25 August 2020. People with influenza-like illness (ILI) were asked questions regarding demographics, illness, personal prevention measures, and residential arrangements. Respiratory swabs were tested for influenza and SARS-Cov-2 by real-time reverse transcription PCR, and viruses were sequenced. Sentinel surveillance data were analyzed to assess recent trends in influenza circulation in the community. RESULTS: Influenza A (H3N2) viruses were identified during sentinel surveillance in Cambodia in July 2020 prior to the reported pagoda outbreak. Among the 362 pagoda residents, 73 (20.2%) ILI cases were identified and 40 were tested, where 33/40 (82.5%) confirmed positive for influenza A (H3N2). All 40 were negative for SARS-CoV-2. Among the 73 residents with ILI, none were vaccinated against influenza, 47 (64%) clustered in 3/8 sleeping quarters, 20 (27%) reported often wearing a mask, 27 (36%) reported often washing hands, and 11 (15%) reported practicing social distancing. All viruses clustered within clade 3c2.A1 close to strains circulating in Australia in 2020. CONCLUSIONS: Circulation of influenza viruses began in the community following the relaxation of national COVID-19 mitigation measures, and prior to the outbreak in a pagoda with limited social distancing. Continued surveillance and influenza vaccination are required to limit the impact of influenza globally.