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We hypothesized that RV\u03c9 reflects the myocardial performance index (MPI), which represents global RV function. A total of 132 consecutive patients, ranging in age from 3 months to 34 years with various cardiac diseases were included in this prospective study. RV\u03c9 was defined as the difference between the peak derivative of pressure (dP\/dt_max\u2009\u2212\u2009dP\/dt_min) divided by the difference between the maximum and minimum pressure (Pmax \u2013 Pmin). RV\u03c9 showed significant negative correlations with the pulsed-wave Doppler-derived myocardial performance index (PWD-MPI) and the tissue Doppler imaging-derived MPI (TDI-MPI) (r\u2009=\u2009\u22120.52 and \u22120.51, respectively; both p\u2009&lt;\u20090.0001). RV\u03c9 also showed significant positive correlations with RV fractional area change (RVFAC) and RV ejection fraction (RVEF) (r\u2009=\u20090.41 and 0.39, respectively; both p\u2009&lt;\u20090.0001), as well as a significant negative correlation with tricuspid E\/e\u2032 (r\u2009=\u2009\u22120.19, p\u2009=\u20090.0283). The clinical feasibility and utility of RV\u03c9 for assessing global RV performance, incorporating both systolic and diastolic function, were demonstrated.<\/jats:p>","DOI":"10.1038\/s41598-019-56564-y","type":"journal-article","created":{"date-parts":[[2019,12,27]],"date-time":"2019-12-27T11:03:12Z","timestamp":1577444592000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["A novel index equivalent to the myocardial performance index for right ventricular functional assessment in children and adolescent patients"],"prefix":"10.1038","volume":"9","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-6143-2673","authenticated-orcid":false,"given":"Yasunobu","family":"Hayabuchi","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yukako","family":"Homma","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shoji","family":"Kagami","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2019,12,27]]},"reference":[{"key":"56564_CR1","first-page":"357","volume":"26","author":"C Tei","year":"1995","unstructured":"Tei, C. et al. 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