Strain Imaging in Heart Failure: From Early Detection to Prognostic Assessment.

Traditional ejection fraction (LVEF)-centric approaches often detect cardiac dysfunction late and offer limited insights into myocardial mechanics. Myocardial strain imaging by two-dimensional speckle-tracking echocardiography (2D STE) has emerged as a high-sensitivity alternative for comprehensive heart failure (HF) evaluation. This synthesis evaluates the diagnostic, prognostic, and therapeutic monitoring capabilities of multi-chamber strain imaging across the HF spectrum. Based on current evidence, global longitudinal strain (GLS) provides superior sensitivity over LVEF in detecting subclinical myocardial injury. In preclinical settings (Stage B HF), a GLS <16% serves as an important diagnostic criterion, reclassifying 13% of asymptomatic patients and predicting a four-fold higher risk of HF hospitalization. In cardio-oncology, a 15% relative decline in GLS successfully identifies subclinical toxicity before LVEF drops. Across HF phenotypes, GLS <16% has been incorporated as a minor diagnostic criterion for HFpEF. GLS is a 1.6-fold better prognostic marker than LVEF (particularly in preclinical stages and HFpEF) and exhibits a more linear relationship with mortality. Furthermore, left atrial (LA) reservoir strain (<18%) accurately grades diastolic dysfunction, while right ventricular free-wall longitudinal strain (RV FWLS) acts as a powerful independent predictor of death. In conclusion, strain imaging has expanded from a specialized technique to a part of contemporary HF evaluation. By capturing myocardial mechanics, it enables early detection, precise phenotyping, robust risk stratification, and timely therapy monitoring.