Irregularities can be made out by the auscultatory method which can not be heard at the heart.
It is measured by noting the first sound audible over the brachial artery using the auscultatory method.
"to listen" (especially with a stethoscope), 1832, from Latin auscultatus, past participle of auscultare "to listen attentively to," from aus-, from auris "ear" (see ear (n.1)); "the rest is doubtful" [OED]. Tucker suggests the second element is akin to clinere "to lean, bend."
auscultate aus·cul·tate (ô'skəl-tāt') or aus·cult (ô'skəlt)
v. aus·cul·tat·ed or aus·cul·ted, aus·cul·tat·ing or aus·cul·ting, aus·cul·tates or aus·cults
To examine by auscultation.