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Correlation between various parameters derived from body surface maps and ejection fraction in patients with anterior
1First Department of Internal Medicine, Nagoya University School of Medicine, Japan.
Insights
Body surface mapping parameters effectively predict cardiac function after anterior myocardial infarction. Specific map parameters, including IQRS and IQRST, show very high correlations with left ventricular ejection fraction (EF).
Area of Science:
- Cardiology
- Medical Imaging
- Electrophysiology
Background:
- Assessing cardiac function post-myocardial infarction (MI) is crucial for patient management.
- Left ventricular ejection fraction (EF) is a key indicator of cardiac function.
- Previous anterior myocardial infarction can impact cardiac performance without overt heart failure.
Purpose of the Study:
- To identify the optimal body surface map parameter for predicting cardiac function.
- To correlate various body surface map parameters with left ventricular ejection fraction (EF) in patients with prior anterior MI.
Main Methods:
- Selected 82 patients with previous anterior MI (3-12 months post-event) and 100 healthy controls.
- Recorded body surface maps using 87 unipolar electrodes.
- Derived parameters from Q map, QRS departure maps, QRS isointegral (IQRS) maps, and QRST isointegral (IQRST) maps.
- Correlated map parameters with angiographically determined EF.
Main Results:
- EF showed significant correlations with multiple map parameters.
- Parameters from QRS departure maps (r = -0.73 to -0.79) and IQRST maps (r = -0.84 to -0.85) demonstrated strong negative correlations with EF.
- Parameters derived from the IQRS map exhibited the highest correlations with EF (r = -0.90 and -0.86).
Conclusions:
- Certain body surface map parameters, particularly from IQRS and IQRST maps, are highly effective predictors of EF.
- These mapping techniques offer a valuable, non-invasive method for assessing cardiac function in patients recovering from anterior MI.
Abstract:
To determine the best map parameter to predict cardiac function, various map parameters were correlated with the left ventricular ejection fraction (EF) in patients with a previous (between 3 months and 1 year) anterior myocardial infarction, but without overt congestive heart failure or ventricular dyssynergy. From 300 consecutive patients with a previous myocardial infarction, 82 patients with only an anterior infarction and who underwent cardiac catheterization and body surface mapping were selected for this study. The maps from 100 healthy subjects were used as normal controls. Body surface maps using 87 unipolar electrodes were recorded and various parameters were derived from the Q map, the QRS departure maps, the QRS isointegral (IQRS) map, and the QRST isointegral (IQRST) maps. They were compared with the angiographically determined EF. The EF was correlated with nQ (r = -0.72), four parameters derived from the QRS departure map (r ranged from -0.73 to -0.79), two parameters derived from the IQRS map (r = -0.90 and -0.86), and two parameters derived from the IQRST map (r = -0.84 and -0.85). Some parameters derived from body surface maps were found to have a very high correlation with the EF in patients who had a previous anterior myocardial infarction.