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Correlations between the surface ECG and the intracavitary electrocardiogram in typical atrial flutter
R Roşu1, L Mureşan, M Andronache
1SCU Cluj-Napoca, Cardiology - Rehabilitation Hospital, Cluj-Napoca, Romania.
Summary
Surface ECG analysis accurately determines atrial flutter rotation direction. This study found high accuracy in differentiating clockwise and counterclockwise atrial flutter using electrocardiogram (ECG) findings.
Area of Science:
- Cardiology
- Electrophysiology
- Medical Diagnostics
Background:
- Typical atrial flutter involves a macro-reentry circuit in the right atrium.
- Surface electrocardiogram (ECG) interpretation for atrial flutter rotation has historically been considered limited.
- Distinguishing clockwise from counterclockwise flutter is crucial for understanding arrhythmia mechanisms.
Purpose of the Study:
- To compare the flutter rotation sequence determined by intracavitary electrograms with surface ECG F wave morphology.
- To evaluate the diagnostic accuracy of surface ECG in identifying atrial flutter rotation direction.
Main Methods:
- Analysis of 387 patients diagnosed with typical atrial flutter via electrophysiological study.
- Determination of flutter rotation sequence (clockwise or counterclockwise) using intracavitary electrograms.
- Assessment of F wave morphology on surface ECG leads (DII, DIII, aVF, aVL, V1, V6).
Main Results:
- Counterclockwise atrial flutter (60.7%) showed 98% positive predictive value (PPV) for negative F waves in inferior leads and positive in V1.
- Clockwise atrial flutter (39.3%) demonstrated 94% PPV for positive F waves in inferior leads and negative in V1.
- High specificity (97%) was observed for both flutter directions, indicating reliable ECG differentiation.
Conclusions:
- Surface ECG possesses significant value in determining the macro-reentry circuit rotation sequence for typical atrial flutter.
- ECG F wave morphology provides a reliable, non-invasive method for differentiating clockwise and counterclockwise atrial flutter.
- These findings support the enhanced utility of surface ECG in diagnosing atrial flutter subtypes.
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