Method and apparatus for processing vectorcardiographic signals for enabling quantitative determination of the percentage of heart muscle tissue affected by an intervention

摘要

Vector cardiogram signals are processed by an analog computer circuit during a QRS wave interval in which a sheet of depolarization traverses a heart muscle to provide signals which enable a determination of the relative volume of heart muscle tissue that is functioning during the QRS wave interval. By comparing such relative volumes determined from signals processed from vectorcardiograms produced both before and after an "intervention" affecting the heart muscle, such as either a myocardial infarction or a therapeutic intervention following a myocardial infarction, it is possible to make a quantitative determination of the percentage of heart muscle tissue affected by the intervention.P PA signal proportional to the volume of heart muscle tissue affected by a myocardial infarction is provided by processing vectorcardiogram signals obtained during a QRS wave interval prior to or at the onset of the infarction and vectorcardiogram signals obtained during a QRS wave interval following the infarction.