Related Experiment Videos
Effect of cardiac pacing on ECG pattern in patients with myocardial infarction
Insights
Electrocardiogram (ECG) analysis in myocardial infarction patients with artificial pacing reveals distinct patterns. Anterior wall infarction shows Q deflection and ST elevation, while inferior wall infarction presents ST elevation without Q deflection.
Area of Science:
- Cardiology
- Medical Imaging
- Electrophysiology
Background:
- Myocardial infarction (MI) can alter electrocardiogram (ECG) findings.
- Artificial pacing is frequently used in patients with MI.
- Understanding ECG changes during pacing in MI is crucial for diagnosis.
Purpose of the Study:
- To analyze ECG tracings in patients with recent and past myocardial infarction undergoing artificial pacing.
- To identify specific ECG patterns associated with different MI locations during pacing.
- To compare ECG morphology in recent versus past MI patients with pacing.
Main Methods:
- Analysis of ECG tracings from 12 patients with recent (8) or past (4) myocardial infarction.
- Patients had permanent or temporary artificial pacing.
- MI locations included anterior, anteroseptal, inferior, and posterior walls.
Main Results:
- Anterior and anteroseptal MI with pacing showed pathological Q deflection and ST segment elevation in leads I, aVL, V5.
- Inferior wall MI with pacing exhibited ST segment elevation in leads II, III, aVF without Q deflection.
- No significant differences in stimulated complex morphology were observed between recent and past MI.
Conclusions:
- ECG patterns during artificial pacing differ based on myocardial infarction location.
- Pacing-induced ECG changes can aid in localizing MI, even with artificial pacing.
- The temporal aspect (recent vs. past MI) does not significantly alter these pacing-related ECG morphologies.
Abstract:
The ECG tracings in patients with recent and past myocardial infarction and permanent or temporary artificial pacing were analysed. The observations were made in 12 patients (8 with recent infarction and 4 with a past one). Anterior wall infarction was diagnosed in 4 subjects, anteroseptal in 3, inferior wall infarction was recognized in 4, and posterior wall infarction in one patient. In the stimulated complexes of persons with anterior and anteroseptal infarctions there appears a pathological Q deflection with ST segment elevation in leads I, aVL, V5. In the infarct of the inferior wall the ST segment elevation occurs in leads II, III, aVF without the presence of Q deflection. No differences were shown in the morphology of stimulated complexes in persons with recent and past myocardial infarction.