Rescue percutaneous coronary intervention (Rescue PCI) is an important reperfusion strategy for patients with ST-segment elevation myocardial infarction (STEMI) who fail to achieve adequate reperfusion following thrombolytic therapy. Although primary PCI remains the preferred reperfusion modality, thrombolysis continues to be widely used in regions where timely PCI is unavailable. Failed thrombolysis is associated with persistent coronary occlusion, ongoing myocardial ischemia, larger infarct size, heart failure, and increased mortality. Rescue PCI aims to restore coronary blood flow and limit myocardial damage in such patients. This study reviews the clinical outcomes, predictors, procedural considerations, complications, and long-term prognosis of Rescue PCI following failed thrombolysis. A comprehensive framework for patient selection and management is proposed based on current evidence and guideline recommendations.