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A 36-year-old woman with levo-transposition of the great arteries presented for a programmed visit. She was asymptomatic and the clinical examination showed no signs of decompensated heart failure. Standard 12-lead ECG showed isorhythmic atrioventricular dissociation. A 24-hour ambulatory recording demonstrated sinus rhythm with intermittent periods of isorhythmic dissociation. This case highlights the association between two rare conditions., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2021. No commercial re-use. See rights and permissions. Published by BMJ.)

We report the case of a previously healthy young woman, who developed a severe form of COVID-19 with massive pneumonia and acute pericarditis in whom constrictive physiology developed rapidly. To our knowledge, this represents the second reported case of SARS-CoV-2 constrictive pericarditis, a rare, but severe cardiac complication., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.)

We report a rare case of native valve endocarditis caused by Staphylococcus warneri in an immunocompetent 79-year-old man with known degenerative valvular heart disease but no previous risk factors such as recent invasive treatment or medical implant. The patient presented with heart failure, due to perforation of the mitral valve, and lacked any signs of infection. The diagnosis of endocarditis with S. warneri was established by echocardiography and positive blood cultures., Competing Interests: Competing interests: None declared., (© BMJ Publishing Group Limited 2019. No commercial re-use. See rights and permissions. Published by BMJ.)