SARS-CoV-2, vaccination or autoimmunity as causes of cardiac inflammation. Which form prevails?

The causes of cardiac inflammation during the COVID-19 pandemic are manifold and complex, and may have changed with different virus variants and vaccinations. The underlying viral etiology is self-evident, but its role in the pathogenic process is diverse. The view of many pathologists that myocyte necrosis and cellular infiltrates are indispensable for myocarditis does not suffice and contradicts the clinical criteria of myocarditis, i.e., a combination of serological evidence of necrosis based on troponins or MRI features of necrosis, edema, and inflammation based on prolonged T1 and T2 times and late gadolinium enhancement. The definition of myocarditis is still debated by pathologists and clinicians. We have learned that myocarditis and pericarditis can be induced by the virus via different pathways of action such as direct viral damage to the myocardium through the ACE2 receptor. Indirect damage occurs via immunological effector organs such as the innate immune system by macrophages and cytokines, and then later the acquired immune system via T cells, overactive proinflammatory cytokines, and cardiac autoantibodies. Cardiovascular diseases lead to more severe courses of SARS-CoV­2 disease. Thus, heart failure patients have a double risk for complicated courses and lethal outcome. So do patients with diabetes, hypertension, and renal insufficiency. Independent of the definition, myocarditis patients benefitted from intensive hospital care, ventilation, if needed, and cortisone treatment. Postvaccination myocarditis and pericarditis affect primarily young male patients after the second RNA vaccine. Both are rare events but severe enough to deserve our full attention, because treatment according to current guidelines is available and necessary.

[The ESC recommendations for COVID-19-no guideline, but a learning guidance]. / Die ESC zu COVID-19 ­ keine Leitlinie, aber ein lernender Leitfaden.

"Not a guideline but a guidance" is the motto of this document of guidance by the European Society of Cardiology, which is designed as an orientation aid to learning for physicians in the coronavirus disease 2019 (COVID-19) pandemic. A total of 62 European cardiologists as authors and 29 further experts as reviewers have contributed to this 119-page document. The emphasis of the guidelines is on a cautious strategy in dealing with a pandemic, which is still characterized by many unknown factors. It is consciously limited to cardiovascular diseases. In the last update from 10 June 2020 many practical instructions for cardiovascular diagnostics and treatment under the conditions of a pandemic are given. These recommendations largely depend on the already well-known guidelines of the ESC. To recapitulate them might be helpful but much is redundant. The sections on the pathophysiology and pathomechanisms by which severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) could specifically affect the cardiovascular system, are informative but sometimes in need of supplementation. It is counterproductive to recommend that pathohistological and molecular investigations of tissues from affected and deceased patients should be avoided. This document of guidance is an ambitious attempt of a learning recommendation that needs some further improvement. It needs an early update if it intends to do justice to the ambitions.

Management perspectives from the 2019 Wuhan international workshop on fulminant myocarditis.

Fulminant myocarditis (FM) is a form of acute myocardial inflammation leading to rapid-onset hemodynamic instability due to cardiogenic shock or life-threatening arrhythmias. As highlighted by recent registries, FM is associated with high rates of death and heart transplantation, regardless of the underlying histology. Because of a paucity of evidence-based management strategies exists for this disease, an International workshop on FM was held in Wuhan, China, in October 2019, in order to share knowledge on the disease and identify areas of consensus. The present report highlights both agreements and controversies in FM management across the world, focusing the attention on areas of opportunity, FM definition, the use of endomyocardial biopsy and viral identification on heart specimens, treatment algorithms including immunosuppression and the timing of circulatory support escalation. This report incorporates the most recent recommendations from national and international professional societies. Main areas of interest and aims of future prospective observational registries and randomized controlled trials were finally identified and suggested.