The difference vector: assessment of effects of changes or interventions.
Vector dipole moments were measured on young pigs before and one week after ligation of the left anterior descending coronary artery. Vectors were obtained for the three peaks of vector spatial magnitude, M. Preoperative, postoperative, and difference vectors were measured for each peak. If excitation is normal except through the infarcted tissue, the difference vector should be more closely related to the infarct because the normal excitation cancels out. It was found that the postoperative vector was changed by the infarct but that the difference vector was a better indication of infarction. This paper was designed to introduce the method using experimental data for a small number of pigs.
D000818:Animals; D009203:Myocardial Infarction / Q000175:diagnosis* / Q000601:surgery; D013552:Swine; D014672:Vectorcardiography