Active clinical trials for "COVID-19"

To identify pulmonary vascular disease in post/long-COVID-19 patients as a cause of dyspnea/exercise limitation and to differentiate it from other causes of dyspnea

Since March 2022, there are an outbreak of SARS-CoV-2 infection (Omicron) in Shanghai. This cohort study aims to analysis the clinical outcomes of neonates born to mothers with SARS-CoV-2 infection.

The overall goal of the study is to investigate the characteristics and potential mechanisms responsible for myocardial injury and dysfunction in patients after COVID-19 vaccination. Cardiac damage will be assessed with cardiac MRI and endomyocardial biopsy (EmBx) histopathology. Myocardial gene expression will be measured in RNA extracted from EmBxs mRNA abundance compared to nonfailing and failing control hearts.

This is a tertiary care hospital-based prospective molecular epidemiology study in Montreal, Canada. When nosocomial transmission was suspected by local infection control teams' investigations, SARS-CoV-2 viral genomic sequencing was performed locally for all putative outbreak cases and contemporary controls. Molecular and conventional epidemiology data were confronted in real time to improve understanding of COVID-19 transmission and reinforce or adapt prevention measures.

In January 2020, researchers isolated and sequenced in China from patients with severe atypical pneumonia a novel coronavirus called severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Coronavirus disease 2019 (COVID-19) caused by SARS-CoV-2 has rapidly spread throughout the world. SARS-CoV-2 may trigger hyperstimulation of immune system with an autoinflammatory response but also the development of an autoimmune process. These autoimmune responses may also develop through the molecular mimicry between virus and human-self components. Multiple autoantibodies have been described in COVID-19 patients. Annexin A2 (ANXA2), an endothelial cell receptor for plasminogen and tissue plasminogen activator has been identified as a new autoantigen in antiphospholipid syndrome. ANXA2 has been identified as candidate autoantigen recognized by SARS patient sera. ANXA2 contributes also to pulmonary microvascular integrity. These data lead to identify anti-ANXA2 antibodies in COVID-19 patient sera and to know if the presence of these antibodies is associated with pulmonary injury or thrombosis in COVID-19 and represents a marker of severity.

Aim of the study is to determine the impact of the COVID-19 pandemic on blood pressure profiles and variability as assessed by ambulatory blood pressure monitoring (ABPM) through the comparison of ABPM data obtained before and during the COVID-19 lockdown in already treated hypertensive patients

Myopericarditis is a rare complication to messenger ribonucleic acid (mRNA) COVID-19 vaccines, especially in male adolescents and young adults. The risk in children 5-11 years old is unknown. In Denmark, the Pfizer-BioNTech mRNA COVID-19 vaccination was recommended from December 1, 2021 in individuals aged 5-11 years old. We aim to estimate the incidence of myopericarditis in children 5-11 years old after mRNA COVID-19 vaccination among vaccinated individuals based on a nationwide prospective population-based cohort study with detailed clinical phenotyping.

SARS-COV-2 infection can progress to acute respiratory distress syndrome and require hospitalization in the ICU in 5-20% of affected patients. Age is a major risk factor for developing a severe form and for death. ARDS related to SARS-COV-2 has specific features, including the need for long mechanical ventilation and length of stay and the use of corticosteroid therapy. These specificities are responsible for significant morbidity (neuromyopathy, delirium, post-resuscitation syndrome) and mortality during the first wave (46% at 3 months for the population of patients aged 70 years and over). To investigator's knowledge, no study has evaluated the prognosis in the ICU and the long-term functional outcome of elderly people admitted for a severe or critical form of COVID-19 since the major changes in management (dexamethasone, screening for thrombo-embolic complications, use of high-flow oxygen therapy as first-line treatment...). Investigator therefore propose a 1-year follow-up of a cohort of patients aged 70 and over hospitalised in a conventional service or in intensive care for a severe or critical form of COVID-19. The objectives are to describe the prognosis and functional outcome of hospitalized elderly patients with severe COVID-19.

A subset of patients with COVID-19 develops acute respiratory failure and acute respiratory distress syndrome (ARDS) (1). The use of invasive mechanical ventilation for the treatment of these conditions is associated with high mortality rates (2,3). The use of high-flow nasal oxygen therapy (HFNO) and awake prone position (AW-PP) could to decrease the need for endotracheal intubation and other adverse clinical outcomes (4-6). The aim of this study is to evaluate the clinical results of the simultaneous application of high-flow nasal oxygen therapy HFNO and awake-prone position in a cohort of patients with severe respiratory failure secondary to COVID-19 on relevant clinical outcomes, and to assess risk factors of treatment failure defined as requirement of invasive mechanical ventilation.

Vaccination is the best way to mitigate the coronavirus disease 2019 (COVID-19) pandemic, but the vaccine immunogenicity may be quite variable from person to person. There is increasing evidence suggesting that the gut microbiome is a major determinant of vaccine immunogenicity. Thus, the investigators investigated the relationship between gut microbiota and humoral immune response after COVID-19 vaccination.