Abstract Funding Acknowledgements Type of funding sources: None. BACKGROUND Myocardial work (MW) estimation by pressure-strain loops (PSL) allows a non-invasive evaluation myocardial performance, as recently demonstrated in adult patients. Aim this study is to provide the reference values for global index (MWI), constructive (MCW), wasted (MWW), and efficiency (MWE) group healthy children. METH...