Viable myocardial tissue

Viable myocardial tissue refers to cardiomyocytes that remain alive and metabolically active following an ischemic insult, even if their contractile function is severely impaired. This clinical state is typically categorized into stunned myocardium, which is a temporary post-ischemic dysfunction that recovers after blood flow is restored, and hibernating myocardium, a chronic adaptive state where the heart downregulates its function to match a reduced blood supply (StatPearls, NBK538225). Identifying viable tissue is a critical diagnostic goal in patients with ischemic cardiomyopathy, as it serves as a predictor for functional recovery and improved survival following revascularization procedures such as coronary artery bypass grafting (CABG) or percutaneous coronary intervention (PCI) (PubMed, 21835310). While not a single molecular target like a receptor or enzyme, the preservation of this tissue is the primary objective of many cardiovascular therapies, including beta-blockers and ACE inhibitors, which reduce myocardial workload and prevent the progression to irreversible fibrosis (Circulation, 2008;117:103-114). Assessment of viability involves advanced imaging techniques that evaluate membrane integrity, glucose metabolism, or contractile reserve to distinguish salvageable muscle from permanent scar tissue (Journal of Nuclear Medicine, 2010;51:1092-1105).

Other names

Viable myocardiumHibernating myocardiumStunned myocardiumSalvageable myocardiumMyocardial viability

Not a molecular target; pharmacological intervention aims to optimize the oxygen supply-demand balance, reduce wall stress, and prevent further remodeling to preserve living cardiomyocytes (StatPearls, NBK538225).