Normalization of abnormal T-waves during stress testing does not identify patients with reversible perfusion defects

Area of Science:

• Cardiology
• Diagnostic Imaging
• Electrocardiography

Background:

• Abnormal T-waves on baseline electrocardiograms can indicate underlying cardiac conditions.
• Stress testing is commonly used to evaluate for myocardial ischemia.

Purpose of the Study:

• To assess the diagnostic accuracy of T-wave normalization during stress testing for identifying myocardial ischemia.

Main Methods:

• Exercise or dobutamine stress tests with perfusion scintigraphy were conducted in 1,173 patients with baseline abnormal T-waves.
• Perfusion scintigraphy results were compared between patients with and without stress-induced T-wave normalization.

Main Results:

• Only 12.2% of patients with reversible perfusion defects showed T-wave normalization during stress.
• A significant majority (76.4%) of patients with T-wave normalization did not have reversible perfusion defects.

Conclusions:

• T-wave normalization during stress testing demonstrates low sensitivity for detecting stress-induced myocardial ischemia.
• The positive predictive value of T-wave normalization for reversible myocardial ischemia is poor.