ðɪs wʌz θˈɔːt təbi ɐ dɪzˈiːz ɐfˈɛktɪŋ bˈoʊθ ðə hˈɑːɹt mˈʌsəl ænd ðɪ ˌɛndoʊkˈɑːɹdiəm ænd ɪt wʌz ɡˈɪvən vˈɛɹiəs nˈeɪmz sˈʌtʃ ɐz: ˌɪdɪəpˈæθɪk hˌaɪpɚtɹˈoʊfi ʌvðə hˈɑːɹt, ˌɛndoʊkˈɑːɹdɪəl skləɹˈoʊsɪs, kˈɑːɹdiˌæk ɛnlˈɑːɹdʒmənt ʌv ʌnnˈoʊn kˈɔːz, ɛtsˈɛtɹə.
This was thought to be a disease affecting both the heart muscle and the endocardium and it was given various names such as: idiopathic hypertrophy of the heart, endocardial sclerosis, cardiac enlargement of unknown cause, etc.