The Molecular Basis of Cardiovascular Diseases

Cardiovascular diseases (CVDs) remain the leading cause of global morbidity and mortality, accounting for nearly one-third of all deaths worldwide. Contemporary understanding has shifted from viewing CVD solely as a hemodynamic disorder to recognizing it as a complex, multifactorial condition driven by interconnected molecular, genetic, cellular, and environmental mechanisms. This chapter explores the molecular basis of cardiovascular diseases, emphasizing dysregulated pathways involving lipid metabolism, inflammation, oxidative stress, endothelial dysfunction, altered gene expression, and epigenetic modifications. It highlights the role of genetic architecture—ranging from rare monogenic disorders to common polygenic traits—in shaping individual susceptibility, disease progression, and therapeutic response. The chapter further examines epigenetic regulation, including DNA methylation, histone modifications, and non-coding RNAs, as key modulators of cardiovascular pathology and potential biomarkers. By integrating advances in molecular biology, genomics, and systems biology, this chapter underscores the foundation of precision cardiovascular medicine and its implications for early diagnosis, risk stratification, and targeted therapeutic development, bridging molecular insights with clinical cardiology practice.