In 1957 Black-Schaffer proposed a unitary explanation that stress on the ventricle, of any kind, may trigger the endocardial reaction, so that all EFE could be thought of as secondary.
ɪn nˈaɪntiːnhˈʌndɹɪd fˈɪfti sˈɛvən blˈækʃˈæfɚ pɹəpˈoʊzd ɐ jˈuːnɪtˌɛɹi ɛksplɐnˈeɪʃən ðæt stɹˈɛs ɔnðə vˈɛntɹɪkəl, ʌv ˌɛni kˈaɪnd, mˈeɪ tɹˈɪɡɚ ðɪ ˌɛndoʊkˈɑːɹdɪəl ɹɪˈækʃən, sˌoʊ ðæt ˈɔːl ˌiːˌɛfˈiː kʊd biː θˈɔːt ʌv æz sˈɛkəndɚɹi.