The 36-lead magnetocardiogram (MCG) demonstrated greater sensitivity to ischemia in the ST-segment compared to the 36-lead ECG (50% vs 40% relative difference), providing a potential alternative for ischemia diagnosis.
Does 36-lead MCG or 36-lead ECG provide greater sensitivity than 12-lead ECG in detecting myocardial ischemia in a computational model?
Computational modeling suggests that 36-lead MCG and 36-lead ECG offer greater sensitivity to myocardial ischemia than standard 12-lead ECG, with MCG being particularly sensitive to ST-segment changes and regional localization.
Absolute Event Rate: 50% vs 40%
Myocardial ventricular ischemia arises from a lack of blood supply to the heart, which may cause abnormal repolarization and excitation wave conduction patterns in the tissue, leading to cardiac arrhythmias and even sudden death. Current diagnosis of cardiac ischemia by the 12-lead electrocardiogram (ECG) has limitations as they are insensitive in many cases and may show unnoticeable differences to normal patterns. As the magnetic field provides extra information on cardiac excitation and is more sensitive to tangential currents to the surface of the chest, whereas the electric field is more sensitive to flux currents, it has been hypothesized that the magnetocardiogram (MCG) may provide a complementary method to the ECG in ischemic diagnosis. However, it is unclear yet about the differences in sensitivity regions of body surface ECG and MCG signals to ischemic conditions. The aim of this study was to investigate such differences by using 12-, 36- ECG and 36-MCG computed from multi-scale biophysically detailed computational models of the human ventricles and torso in both control and ischemic conditions. It was shown that ischemia produced changes in the ECG and MCG signals in the QRS complex, T-wave and ST-segment, with greater relative differences seen in the 36-lead ECG and MCG as compared to the 12-leads ECG (34% and 37% vs 26%, respectively). The 36-lead ECG showed more averaged sensitivity than the MCG in the change of T-wave due to ischemia (37% vs 32%, respectively), whereas the MCG showed greater sensitivity than the ECG in the change of the ST-segment (50% vs 40%, respectively). In addition, both MCG and ECG showed regional-dependent changes to ischemia, but with MCG showing a stronger correlation between ischemic region in the heart. In conclusion, MCG shows more sensitivity than ECG in response to ischemia, which may provide an alternative method for the diagnosis of ischemia.
Alday et al. (Wed,) conducted a other in Myocardial Ischemia. 36-lead magnetocardiogram (MCG) vs. 12-lead and 36-lead electrocardiogram (ECG) was evaluated on Relative difference in ST-segment amplitude between control and ischemic conditions. The 36-lead magnetocardiogram (MCG) demonstrated greater sensitivity to ischemia in the ST-segment compared to the 36-lead ECG (50% vs 40% relative difference), providing a potential alternative for ischemia diagnosis.