Genetic, Clinical, and Sociodemographic Profile of Individuals with Diagnosis or Family History of Hypertrophic Cardiomyopathy: Insights from a Prospective Cohort.

Background: Hypertrophic cardiomyopathy (HCM) is a genetic cardiac disorder characterized by left ventricular hypertrophy in the absence of secondary causes. This study aimed to investigate the genetic, clinical, and epidemiological profile of individuals with clinical HCM or a family history of sudden cardiac death (SCD). Methods: A total of 200 participants (58% male, median age 52 years) underwent genetic testing using a 19-gene panel associated with HCM and phenocopies. Variants were classified as pathogenic/likely pathogenic (P/LP), variants of uncertain significance (VUS), or negative. Clinical and imaging data were correlated with genetic findings. Results: P/LP variants were identified in 31% of individuals, while 40.5% carried VUS, and 28.5% tested negative. A positive genotype was more frequent among patients with clinical HCM (37.7%) than among those with only a family history (18.6%, p = 0.006). Sarcomeric mutations represented 77.4% of positive results, while 22.6% involved phenocopy genes, notably TTR (amyloidosis). Positive genotypes were significantly associated with a family history of SCD (68% vs. 46%, p = 0.004) and with greater interventricular septal thickness (17 mm vs. 15 mm, p < 0.001). Conclusions: Septal thickness >17 mm and family history of SCD were strong predictors of positive genetic results. These findings emphasize the importance of genetic screening and counseling in high-risk individuals and highlight the value of integrating genetic testing into clinical practice for diagnosis, risk stratification, and family management.