The Lesser Electrocardiographic Signs of Cardiac Pain

When the cardiographic diagnosis of cardiac infarction was first described a characteristic pattern was assigned to the pathological tracing; it consisted of deviation of the S-T segment, inversion of the T wave, and often the presence of significant Q waves (Herrick, 1919; Pardee, 1920; Parkinson and Bedford, 1928). The next few years saw a search for leads that would portray the lesser changes of myocardial injury more clearly than the orthodox limb leads, and so chest lead electrocardiography came into use (Wolferth and Wood, 1932).