Over the past decade, groundbreaking research has highlighted the complex mechanisms underlying cardiac conditions such as heart failure and arrhythmias, demonstrating that heart disease is not solely the result of dysfunction in cardiac muscle cells (cardiomyocytes). In a healthy heart, non-cardiomyocytes — such as neurons, fibroblasts, and immune cells — outnumber myocytes and play essential roles in maintaining cardiac homeostasis. Following injury, the numbers and phenotypes of these non-myocyte populations change dramatically, contributing to disease.

Emerging evidence indicates that the intricate crosstalk between cardiomyocytes and non-cardiomyocytes modulates key electrophysiological, structural, and inflammatory pathways that drive the onset and progression of arrhythmias and heart failure. Despite these advances, many challenges remain in fully elucidating how these cellular interactions contribute to the multicellular remodeling that leads to cardiac dysfunction. 

By delving into these intercellular communications and the underlying signaling networks, this Methods Collection aims to foster research into novel disease mechanisms, ultimately advancing a more integrated understanding of cardiac pathophysiology.