The Interplay Between Calcium Homeostasis and Cardiac Function in Congestive Heart Failure: Implications for Coronary Artery Disease

Congestive heart failure (CHF) represents a complex clinical syndrome characterized by the heart's inability to pump blood effectively to meet the body's metabolic demands. Central to the pathophysiology of CHF is the dysregulation of calcium homeostasis, which plays a fundamental role in excitation-contraction coupling and cardiac performance. This comprehensive review examines the intricate relationship between altered calcium handling and the development and progression of CHF, with particular emphasis on its implications for coronary artery disease (CAD). The review synthesizes current literature to elucidate the molecular mechanisms underlying calcium dysregulation in failing hearts, explores the bidirectional relationship between calcium homeostasis and coronary artery function, and evaluates emerging therapeutic strategies targeting calcium-handling proteins. Key findings indicate that impaired calcium cycling, involving dysfunction of the sarcoplasmic reticulum calcium ATPase, ryanodine receptors, and L-type calcium channels, contributes significantly to contractile dysfunction and arrhythmogenesis in CHF. Furthermore, the interplay between calcium homeostasis and CAD creates a pathophysiological cycle that exacerbates both conditions. Understanding these mechanisms is crucial for developing targeted therapeutic interventions that can improve cardiac function, reduce symptoms, and enhance survival in patients with CHF and concurrent CAD. Future research directions should focus on personalized approaches to calcium modulation and the development of novel therapeutic targets within the calcium-handling machinery.