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T-wave alterations at the onset of wall motion abnormalities during dobutamine echocardiographic stress test
F Fantini1, G Barletta, R Del Bene
1Institute of Internal Medicine and Cardiology, University of Florence, Italy.
Insights
Dobutamine stress testing revealed that a steeper T-wave amplitude increase during wall motion changes indicates critical coronary stenoses. This finding helps differentiate localized from widespread coronary artery disease effects.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Electrophysiology
Background:
- Dobutamine echocardiographic stress testing (DEST) is crucial for diagnosing coronary artery disease (CAD).
- Electrocardiogram (ECG) changes during stress testing can provide valuable diagnostic information.
- Understanding the relationship between ECG alterations and myocardial response is key to accurate diagnosis.
Purpose of the Study:
- To investigate the correlation between T-wave amplitude changes and wall motion alterations during DEST in patients with critical coronary stenoses.
- To differentiate between localized and widespread wall motion abnormalities based on ECG findings during DEST.
Main Methods:
- Prospective study involving 17 patients with normal baseline wall motion and critical coronary stenoses, compared to 11 control subjects.
- Dobutamine echocardiographic stress testing was performed, monitoring both wall motion and ECG parameters, specifically T-wave amplitude and ST-segment displacement.
- Analysis focused on the rate of T-wave amplitude increase relative to the onset of wall motion abnormalities.
Main Results:
- A steeper increase in T-wave amplitude was observed in patients with critical coronary stenoses compared to controls at the onset of wall motion alterations.
- Patients exhibiting increased T-wave amplitude predominantly showed localized apical dyssynergy.
- Downward ST-segment displacement was associated with widespread wall motion alterations affecting basal and mid segments.
Conclusions:
- The pattern of T-wave amplitude increase during DEST can serve as an early indicator of critical coronary stenoses.
- Distinct ECG changes (T-wave amplitude vs. ST-segment displacement) correlate with different patterns of myocardial ischemia (localized apical vs. widespread).
- This study highlights the utility of combined ECG and echocardiographic analysis during dobutamine stress testing for improved CAD assessment.
Abstract:
At the onset of wall motion alterations during dobutamine echocardiographic stress testing, a steeper increase in the overall T-wave amplitude in the precordial leads was observed in 17 patients with baseline normal wall motion, electrocardiogram, and critical coronary stenoses compared with 11 control subjects. Eleven patients with increasing T-wave amplitude had localized apical dyssynergy, whereas 6 patients with downward displacement of the ST segment had widespread wall motion alterations also located at the basal and midsegments.