LEFT VENTRICULAR REMODELING IN HEART FAILURE (PART ІI): PHENOTYPIC HETEROGENEITY AS A RATIONALE FOR PERSONALIZED PATIENTS` MANAGEMENT

Aim: to provide a literature review of the current conсepts on phenotypic heterogeneity of left ventricular (LV) remodeling in heart failure (HF), and highlight the significance of such a diversity for an implementation of personalized patients` management. This paper is a second part of the review, devoted to the current state of pathophysiology of LV remodeling in HF. Material and methods. The thematic scientific papers, published predominantly during the last decade, constituted the study material. The research methodology involved bibliosemantic method and structural and logical analysis. Results and discussion. HF is a heterogeneous, multifactorial and rising epidemic syndrome. To date, the LV ejection fraction (EF) is used as a substantial criterion for HF classification and management. However, the existing research data has revealed the significant overlapping between different LV EF-based HF patterns in terms of the risk factors, comorbidities and disease modifiers; bidirectional transitions of LV EF due to disease treatment and progression; myocardial fibrosis and dysfunction; effectiveness of neurohumoral inhibitors etc. Moreover, the «spectrum» paradigm has been recently proposed, positioning HF as a spectrum across different phenotypes. Particularly, each HF phenotype is the result of a patient-specific trajectory, being an exceptional and unique «track» for the heart transition towards different remodeling patterns. The HF phenotyping may be an innovative approach to the study of myocardial remodeling and HF, which is potentially an important prerequisite for the development of individualized patients` treatment. Personalized medicine can offer the particular options for managing HF patients, that, in turn, will better identify responders, non-responders, and those at high risk of adverse events, and ultimately improve of the treatment efficacy and safety. Conclusions. The baseline heterogeneity of the structural and functional patients` characteristics, including those describing the LV remodeling, and their dynamic change over time, creates a spectrum across overlapping HF phenotypes, challenging a categorical HF classification based solely on LV EF. Such an approach to treat the HF phenotypic heterogeneity may provide further insights into the pathomechanisms, related to LV remodeling in HF, and has the potential to improve the personalized patients` management.