In order of the proportion of keywords, they were arrhythmia/VT/ventricular fibrillation (VF), SCD, genetics testing/genetic mutation, desmosome/PKP2, cardiac magnetic resonance (CMR), catheter ablation, implantable cardioverter defibrillator (ICD), HF, echocardiography, prognosis, and risk stratification respectively (Figure 4a). This evidence concerns the gene PKP2 and hydrops fetalis.