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Cite this article as : Calhoun A , Lee M-H , Pisano DV , Karavas A & Ortoleva J . Variability in triggers for mechanical left ventricular unloading in VA-ECMO : A literature search . J Extra Corpor Technol 2025 , 57 , 24 – 31 . https :// doi . org / 10.1051 / ject / 2024031 .