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Background: Extracorporeal membrane oxygenation (ECMO) is an effective cardiopulmonary support therapy, which can provide temporary cardiopulmonary support for critically ill patients whose condition cannot be reversed by conventional therapy. However, there are many complications in the use of ECMO, such as bleeding, thrombosis, and so on. Among them, inferior vena cava (IVC) thrombosis which can cause pulmonary embolism is a rare complication, which may be life-threatening., Case Presentation: A 75-year-old female patient (Han Chinese ethnicity) with acute heart failure due to acute myocardial infarction in our department was retrospectively analyzed. After regular treatment was unsuccessful, she was treated with venoarterial ECMO (VA-ECMO). After her condition improved, she was withdrawn from ECMO and experienced a complication of IVC thrombosis. Enoxaparin was given immediately for 1 mg/kg every 12 hours hypodermic injection. The thrombus disappeared after anticoagulant therapy. She was discharged on the 60th day. Her level of consciousness returned to normal without residual central nervous system-related complications., Conclusions: IVC thrombosis is one of the possible serious complications in the process of ECMO therapy. Prevention of thrombosis and optimization of the anticoagulant regimen are the main preventive measures. Anticoagulant therapy is still the main treatment of IVC thrombosis in the process of ECMO therapy. Other interventional strategies need to accumulate clinical experience., (© 2021. The Author(s).)