Integrating genetics and phenotyping in clinical management of dilated and non-dilated left ventricular cardiomyopathy

Abstract

Over the past decades, the approach to cardiomyopathies has deeply evolved. It has progressively transitioned from one predominantly based on clinical evaluation and conventional imaging towards an integrated and multidimensional approach that incorporates advanced imaging techniques, tissue characterization, and comprehensive genetic testing. In this perspective, the current classification of cardiomyopathies, from the European Society of Cardiology, has introduced the new entity of non-dilated left ventricular cardiomyopathy (NDLVC) that encompasses a spectrum of diseases from hypokinetic non-dilated forms [formerly called dilated cardiomyopathies (DCMs)] to non-hypokinetic non-dilated forms, characterized by left ventricular scar (previously called arrhythmogenic cardiomyopathies). However, the pivotal principle of the new classification is that the phenotype should be considered the starting point of a dynamic diagnostic pathway rather than its ultimate definition. Contemporary evaluation of patients with DCM and NDLVC requires a longitudinal and integrative perspective in which clinical features, imaging markers, and molecular data converge to refine disease characterization. Stated that, several aspects warrant further refinement. Arrhythmic risk stratification of DCM and NDLVC remains incompletely delineated, reflecting the complex and heterogeneous nature of the underlying arrhythmogenic substrate and its variable expression across different stages of the diseases. In addition, a proportion of patients remain genetically elusive despite extensive testing, underscoring the need for deeper molecular insights. At the same time, the expanding recognition of genotype-positive/phenotype-negative individuals introduces clinical scenarios that are not yet fully delineated, particularly with regard to surveillance strategies and preventive decision-making.

This review paper aims to provide a structured and evidence-informed framework to guide personalized management of DCM and NDLVC, starting from the phenotype towards precision medicine.