the practical value of measuring the ratio of potassium ion ( k+ ) to sodium ion ( na+ ) in myocardium as an indicator of early inapparent infarction in sudden cardiac death was assessed using a series of 29 human hearts from selected coroner 's autopsies together with experimental material from dogs , including infarcts of 5 min to 4 h duration .
C0027051
myocardium
C0021308
infarcts