Introduction: Post–myocardial infarction (MI) mechanical complications remain catastrophic and require early detection. Con ventional 2D echocardiography may be limited in tachycardic or critically ill patients due to inadequate frame rates. Case Report: A middle-aged man aged 55-year-old with hypertension, hypothyroidism, and prior above-knee amputation pre sented with NSTEMI, evidenced by ST depression in V2–V6 and elevated Troponin I. Initial 2D echocardiography was normal. Coronary angiography showed single-vessel LAD disease with branch involvement, and OCT-guided PCI with two drug-eluting stents and a drug-eluting balloon was successfully performed. Despite initial stability, he developed sudden pulmonary edema, cardiogenic shock, and a new pansystolic murmur, suggesting a post-MI mechanical complication. Persistent tachycardia hin dered adequate echocardiographic visualization. A novel “Frame Rate Control’’ technique using Blender 3D software was applied to generate high-quality slow-motion reconstructions of the echo loops, enabling clearer assessment. This technique confirmed ruptured chordae tendineae with severe mitral regurgitation. Results: The patient’s respiratory failure progressed from oxygen therapy to BiPAP and ultimately mechanical ventilation. Emer gency high-risk mitral valve replacement was undertaken, but he could not be weaned from cardiopulmonary bypass and re quired massive transfusion due to recent antiplatelet and anticoagulant therapy. He died on postoperative day one. Discussion: This case underscores the need for prompt detection of post-MI mechanical complications and demonstrates the first documented clinical use of Blender 3D software to optimize echocardiographic frame-rate limitations. Such techniques may aid diagnosis when conventional imaging is inadequate, especially in hemodynamically unstable patients.