What is the survival rate on ECMO?

Could you elaborate on the survival rate for patients undergoing extracorporeal membrane oxygenation, or ECMO? Are there any factors that influence this rate, such as the severity of the patient's condition or the duration of ECMO treatment? Are there any specific conditions or diseases that ECMO is particularly effective in treating, and do they correlate with higher survival rates? Additionally, are there any potential complications or risks associated with ECMO therapy that could impact the survival rate?