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[The U-wave in ischemia and left ventricular dysfunction after myocardial infarct]
Fahir Baraković1, Zumreta Kusljugić, Elnur Smajić
1Interna klinika, Medicinski fakultet Univerziteta u Tuzli, Univerzitetski Klinicki Centar Tuzla.
Medicinski Arhiv
|June 19, 2004
Summary
The U-wave on an electrocardiogram can help diagnose myocardial ischemia and left chamber dysfunction after an exercise test. Its presence indicates potential issues, though its influence is small.
Area of Science:
- Cardiology
- Electrophysiology
- Diagnostic Imaging
Context:
- The U-wave in an electrocardiogram (ECG) is a distinct wave following the T-wave, representing a period of heightened myocardial excitability.
- Understanding the U-wave's significance in cardiac electrical activity is crucial for diagnosing heart conditions.
Purpose:
- To analyze the occurrence and diagnostic value of the U-wave in patients undergoing an exercise test.
- To investigate the correlation between U-wave presence and myocardial ischemia and left ventricular dysfunction.
Summary:
- A prospective study of 51 patients evaluated ECG, exercise tests, and echocardiography.
- Positive U-waves were observed in 51% of participants. U-wave sensitivity for detecting ischemia was 66.67%.
- While U-wave showed weak correlation with systolic dysfunction (0.263) and even weaker with diastolic dysfunction (0.108), its registration after exercise (heart rate ≤ 95 bpm) is an additional diagnostic parameter.
Impact:
- The study suggests that U-wave registration, particularly when observed at rest after an exercise test with a heart rate of 95 bpm or lower, can serve as an supplementary indicator.
- This finding contributes to improving the diagnostic accuracy for myocardial ischemia and left ventricular dysfunction.