Conduction System Disease Preceding Hypertrophy in IVS4+919G greater than A Fabry Variant

Right bundle branch block shows up before the heart thickens in IVS4+919G greater than A Fabry carriers. Conduction disease is the electrical signature, not hypertrophy. 905 carriers from a regional genetic screen showed a 9-fold increased risk of RBBB compared to matched controls, with pacemaker implantation risk also elevated 9-fold. ECG alone detected disease in 88% of carriers when combining LV hypertrophy with conduction abnormalities, substantially exceeding echocardiography alone (51.5% sensitivity). The conduction phenotype precedes structural changes visible on echo, reversing the typical diagnostic sequence. PR interval prolongs rather than shortens, an atypical pattern for Fabry disease. Females showed a catch-up phenomenon after age 60 and carried 2.5-fold higher prevalence than males across age groups, suggesting sex-specific disease trajectories that remain mechanistically unclear. Study confined to East Asian populations where IVS4+919G greater than A is most prevalent. Generalizability to other geographic regions and genetic backgrounds requires external validation. Stroke and atrial fibrillation risk did not differ significantly between carriers and controls (AF HR 1.435, 95% CI 0.69-2.96, p=0.289), limiting arrhythmia-focused surveillance strategies. Authors: Chung WH, Tung CC, Liu TY, Chang WJ, Chang KC, Lin WD, Liang HY, Tsai FJ. https://pubmed.ncbi.nlm.nih.gov/42770... Structuring longitudinal ECG and echo data into validated phenotype cohorts demands standardized data pipelines that handle temporal alignment and missing values without losing signal. Axonovyn's structured data layer helps clinics and research teams convert messy serial ECG and imaging records into clean, model-ready datasets that enable earlier detection strategies like this one. If you're running a genetic screening program or building predictive models for inherited cardiac disease, let's talk about how to scale phenotypic surveillance. Email axonovyn@gmail.com. #FabryDisease #CardiacGenetics #ECG #ConductionDisorder #PopulationScreening #PrecisionMedicine