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A method for detecting myocardial abnormality by using a current-ratio map calculated from an exercise-induced
A Kandori1, H Kanzaki, K Miyatake
1Hitachi Ltd, Tokyo, Japan. kandori@crl.hitachi.co.jp
Medical & Biological Engineering & Computing
|February 24, 2001
Summary
A new current-ratio map method using magnetocardiogram signals helps identify angina pectoris (AP) ischaemic areas. This technique aids in pinpointing coronary artery issues and assessing treatment effectiveness.
Area of Science:
- Cardiology
- Biophysics
- Medical Imaging
Background:
- Angina pectoris (AP) diagnosis relies on identifying ischaemic areas.
- Current diagnostic methods may require further refinement for precise localization.
Purpose of the Study:
- To develop and validate a novel method for determining the ischaemic area in AP patients.
- To assess the utility of current-ratio maps derived from magnetocardiogram (MCG) signals for diagnosing and localizing myocardial ischaemia.
Main Methods:
- Utilized 64-channel magnetocardiogram (MCG) signals to calculate current-arrow maps.
- Developed a current-ratio map by comparing exercise-induced and at-rest current vectors.
- Measured MCG signals from eight AP patients and four healthy volunteers before and after an exercise test.
Main Results:
- Current-ratio maps exhibited distinct patterns (LCX, RCA, LAD) in patients with effort AP, differing from normal patterns.
- Variant AP patients showed patterns similar to normal subjects.
- A maximum current ratio threshold of 0.4-0.5 was suggested for diagnosing ischaemic abnormalities.
- Post-treatment assessment showed reduced cardiac ischaemia in all patients.
Conclusions:
- The current-ratio map method shows promise for estimating the location of ischaemic areas in AP patients.
- This technique may offer a non-invasive approach to assess myocardial ischaemia and guide treatment decisions.