During 1971-1977, the dominant paradigm coalesced around integrating catheter-based diagnostic imaging with therapeutic aspirations, laying groundwork for percutaneous revascularization. Real-time angiographic visualization refined understanding of coronary anatomy and function, and early studies linked ischemic injury mitigation to reperfusion concepts and targeted intervention, foreshadowing PCI. The period also exposed gaps between imaging and true pathology, guiding tempered expectations and safer, iterative approach to invasive strategies.