This JACC manuscript details a first-in-human study evaluating the Magenta Elevate, a novel high-output mechanical circulatory support (MCS) catheter. The study assessed its safety and efficacy during high-risk percutaneous coronary intervention (PCI), particularly in left main coronary artery interventions. Results showed the device to be safe, with no major adverse events, and effective in maintaining hemodynamic stability even during prolonged balloon occlusions. The high output of the pump resulted in left ventricular unloading and ventriculo-arterial uncoupling in many patients. Further research is needed to confirm these initial findings.