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Marked depth of ST-segment depression during treadmill exercise testing; indicator of severe coronary artery disease
Insights
Treadmill stress testing can identify severe coronary artery disease. Marked ST-segment depression during exercise indicates advanced disease, helping select patients for intensive treatment.
Area of Science:
- Cardiology
- Diagnostic Imaging
Background:
- Coronary artery disease (CAD) diagnosis and severity assessment are critical for patient management.
- Treadmill stress testing is a common non-invasive tool for evaluating myocardial ischemia.
Purpose of the Study:
- To determine if treadmill stress testing can identify patients with advanced coronary artery disease.
- To assess if the degree of ischemic ST-segment depression predicts disease severity.
Main Methods:
- Prospective study of 59 patients with documented coronary artery disease.
- Maximal treadmill testing and coronary angiography performed on all participants.
- Patients categorized into three groups based on ST-segment depression severity during exercise.
Main Results:
- Patients with marked ST-segment depression (≥3 mm) showed significantly higher rates of triple-vessel disease (69%) and proximal left anterior descending artery lesions (92%).
- This group also exhibited more extensive overall coronary artery disease based on a validated scoring system.
- Normal or mild ST-segment depression was associated with less severe coronary artery disease.
Conclusions:
- Marked ST-segment depression during treadmill stress testing is a valuable indicator of severe coronary artery disease.
- This finding aids in identifying high-risk patients who may benefit from aggressive diagnostic and therapeutic interventions.
- Treadmill stress testing can effectively stratify patients with coronary artery disease based on prognostic indicators.
Abstract:
This study was designed to evaluate whether treadmill stress testing would facilitate selection of patients with advanced coronary artery disease and, specifically, whether markedly abnormal ischemic responses could be used as indicators of severity of disease. Among 59 consecutive patients with documented coronary artery disease having both maximal treadmill testing and coronary angiographic studies, 15 (group 1) had normal responses to exercise, 18 (group 2) showed 1 to 2.9 mm "ischemic" (flat or downward-sloping) ST-segment depression, and 26 (group 3) demonstrated marked (or equal to 3 mm) ischemic responses. Group 3 had statistically significant higher incidences of triple-vessel disease (18/26; 69 percent) and proximal lesions of the left anterior descending coronary artery (24/26; 92 percent), compared with group 1 (2/15 and 10/15, respectively) and group 2 (6/18 and 12/18, respectively). Group 3 also manifested more extensive disease than groups 1 and 2 (judged by scoring system of Friesinger et al), with a score of 11 or more in 18 of 26 patients. We conclude that marked depth of "ischemic" ST-segment depression aids in identifying that subgroup of the coronary population with severe coronary artery disease and, therefore, serves as a useful means of culling out patients with a potentially serious prognosis who might benefit from intensive diagnostic or therapeutic interventions.