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Electrocardiographic patterns in acute inferior myocardial infarction with and without right ventricle involvement:
E Correale1, R Battista, A Martone
1Istituto di Ricerche Farmacologiche Mario Negri, Milan, Italy.
Insights
ST changes in acute inferior myocardial infarction (AIMI) indicate lesion location and extent. Right ventricular (RV) involvement suggests proximal right coronary artery occlusion and can mask posterior infarct extension.
Area of Science:
- Cardiology
- Medical Diagnostics
- Electrocardiography
Background:
- ST depression in leads V1-V4 is well-studied in acute inferior myocardial infarction (AIMI).
- ST changes in other leads and right ventricular (RV) involvement in AIMI are less understood.
- Limited research exists on the association between ST changes and RV involvement in AIMI.
Purpose of the Study:
- To elucidate the significance of ST changes in AIMI.
- To clarify the role and implications of RV involvement in AIMI.
- To correlate electrocardiographic findings with coronary anatomy and infarct characteristics.
Main Methods:
- Enrolled 71 patients with AIMI within 6 hours of symptom onset, all receiving thrombolysis.
- Classified patients based on ST patterns and RV involvement.
- Segmented the right coronary artery and developed a coronary score.
- Compared electrocardiographic (ECG) findings with creatine phosphokinase (CPK) peaks, ejection fractions, and coronary angiographies.
Main Results:
- ST changes correlate with the site, extension, and extent of AIMI.
- RV involvement identifies the right coronary artery as the culprit vessel (100%) and suggests proximal lesions.
- RV involvement can mask posterior infarct extension.
- Isolated AIMI signs indicate peripheral obstruction; collateral circulation may develop early.
Conclusions:
- ST changes and RV involvement have diagnostic and prognostic value in AIMI.
- Higher mortality in RV involvement may be due to masked posterior extension, not RV involvement itself.
- The study validates a classification system for AIMI and right coronary artery segmentation.
Background:
In acute inferior myocardial infarction (AIMI), the ST depression from V1 to V4 has been the subject of many papers, while the ST changes in other leads, their association, and the right ventricular (RV) involvement have been studied less.
Hypothesis:
This study was performed to contribute to the meaning of the ST changes and RV involvement in AIMI.
Methods:
Seventy-one patients, admitted within 6 h from symptom onset, all thrombolysed, were enrolled. We classified them according to ST patterns and RV involvement. We divided the right coronary artery into three segments, considering the origin of RV branch and the crux as dividing points. We established a coronary score attributing 2 points to each terminal branch. Comparisons were performed between the electrocardiographic (ECG) findings at onset, the creatine phosphokinase (CPK) peaks, the radionuclide ejection fractions, and the coronary angiographies.
Results:
We found that the ST changes give indications regarding the site, extension, and extent of AIMI; RV involvement can mask posterior extension, points to the right coronary as the culprit vessel (100%), and, with high probability, indicates the proximal segment as the site of the lesion; the ECG signs of isolated AIMI indicate a peripheral obstruction; and a collateral circulation may appear relatively early.
Conclusions:
Our findings prove the diagnostic and prognostic value of the ST changes and RV involvement at the onset of AIMI and suggest that the higher in-hospital mortality and complication rates found with RV involvement and reported in the literature are related more to posterior extension, masked by RV involvement than to this involvement per se. Furthermore, these findings prove the clinical value of our classification of the AIMIs and distinction in segments of the right coronary artery.