DOI: 10.1161/circ.148.suppl_1.13423 ISSN: 0009-7322

Abstract 13423: Magnetocardiography as a Noninvasive Diagnostic Strategy for Ischemia Evaluating Following Coronary Revascularization of Patients With Non-ST Segment Elevation Myocardial Infarction

Linqi Liu, shuwen yang, Huan Zhang, Shu Zhou, Xueyao Yang, Zhao Ma, Bin Cai, Ming Ding, Chenchen Tu, Xiantao Song, Hongjia Zhang
  • Physiology (medical)
  • Cardiology and Cardiovascular Medicine

Introduction: Magnetocardiography (MCG) constitutes a non-invasive and radiation-free procedure that quantifies the heart's magnetic fields and has exhibited sensitive diagnostic capabilities for ischemia. Typically, MCG presents a distinctive pattern in healthy subjects, characterized by a positive and a negative pole that forms an angle of approximately 45-60 degrees within the T peak segment.

Hypothesis: Our study aims to monitor the significant alterations in MCG patterns among patients with Non-ST Segment Elevation Myocardial Infarction (NSTEMI) undergoing revascularization.

Methods: Patients were prospectively enrolled and MCG scans were conducted thrice: three days pre-intervention, one week post-intervention, and at a three-month follow-up.

Results: Four patients underwent anatomical complete revascularization, while one patient had incomplete revascularization. When comparing the MCG patterns of patients with NSTEMI (Figures B-F) to a normal MCG pattern (Figure A), pre-intervention scans showed angular deflection (80%, except for patient 3) and an anomalous distribution of poles (100%). One week post-intervention, patients who underwent complete revascularization (Figures B-D) had myocardial enzymes normalized, along with slight angle recovery and reshaping of the poles (100%). By the three-month follow-up, these patients experienced symptom resolution, and their MCG patterns showed normalized angles with recovered poles (100%). However, the patient who underwent incomplete revascularization (Figure F) exhibited sustained myocardial ischemia symptoms, with no further angle recovery and continued anomalous distribution of positive poles, both post-intervention and during follow-up.

Conclusions: The distribution of poles and angular deflection could potentially serve as indicators of ischemia. MCG may represent a promising strategy for evaluating myocardial recovery in patients with NSTEMI.

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