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Rare diseases and disorders and rare cardiovascular complications

In this issue, readers can find a review paper entitled “Superior vena cava syndrome associated with implantable cardiac devices procedures (RCDD code: VI-2A-5)”. In the title of this review, readers will find a new code from the upcoming ”Clinical classification of rare cardiac arrhythmogenic and conduction disorders, and rare arrhythmias” which is a part of ”Clinical classification of rare cardiovascular diseases and disorders”[1]. The authors, from the Medical University of Warsaw, discuss pathogenesis, aetiology, morbidity, risk factors for superior vena cava syndrome, its diagnostics and treatment.