BACKGROUND: Veno-arterial extracorporeal membrane oxygenation (VA-ECMO) is vital for stabilizing patients with severe cardiac and pulmonary failure. Effective management requires precise monitoring of organ perfusion and systemic physiologic status. Near-infrared spectroscopy (NIRS) and ultrasound (US) are emerging as key methods of assessment, but their combined utility remains underexplored in VA-ECMO patients. METHODS: A retrospective analysis was conducted on 267 patients who received VA-ECMO between June 2018 and July 2023. Patients were divided into two groups based on weaning success, defined as survival for more than 48 hours post-weaning with improved cardiac function. Weaning trials involved incremental reductions in VA-ECMO flow, monitored by mean arterial pressure and other clinical measurements. Data including demographics, clinical scores [Glasgow Coma Scale (GCS), Acute Physiology and Chronic Health Evaluation II (APACHE II), Sequential Organ Failure Assessment (SOFA)], blood gas indicators, and NIRS and US metrics were collected and analyzed. RESULTS: Significant differences were observed in cerebral regional oxygen saturation (rSO CONCLUSION: NIRS and US were found to beconsistent and complementary modalities for assessing perfusion and cardiac function in VA-ECMO patients.