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Upright bicycle exercise echocardiography after coronary artery bypass grafting
S G Sawada1, W E Judson, T Ryan
1Department of Medicine, Indiana University School of Medicine, Indianapolis.
Insights
Exercise echocardiography effectively identifies nonrevascularized coronary arteries after bypass surgery. This method accurately detects and localizes coronary artery disease, aiding in patient management post-coronary artery bypass grafting (CABG).
Area of Science:
- Cardiology
- Diagnostic Imaging
- Vascular Surgery
Background:
- Coronary artery bypass grafting (CABG) aims to restore blood flow to the heart.
- Assessing the status of nonrevascularized vessels post-CABG is crucial for patient outcomes.
- Exercise echocardiography is a non-invasive tool for evaluating cardiac function.
Purpose of the Study:
- To determine if exercise-induced wall motion abnormalities correlate with nonrevascularized coronary vessels after CABG.
- To assess the accuracy of upright bicycle exercise echocardiography in localizing these abnormalities.
- To evaluate the presence and location of nonrevascularized vessels post-CABG.
Main Methods:
- 42 patients underwent upright bicycle exercise echocardiography and coronary angiography post-CABG.
- Echocardiograms were recorded at rest, peak exercise, and post-exercise.
- Nonrevascularized vessels were defined based on graft status and distal obstructions.
Main Results:
- 94% of patients with nonrevascularized vessels showed exercise-induced wall motion abnormalities.
- 83% of patients with all vessels revascularized had no such abnormalities.
- Abnormalities were accurately localized to specific coronary artery territories (LAD, R-LC).
Conclusions:
- Upright bicycle exercise echocardiography is a feasible and effective technique after CABG.
- The method accurately detects and localizes nonrevascularized coronary vessels.
- Exercise-induced wall motion abnormalities are reliable indicators of residual coronary disease post-CABG.
Abstract:
Upright bicycle exercise echocardiography and coronary angiography were performed in 42 patients from 1 month to 15 years (mean 6.3 years) after coronary artery bypass grafting (CABG) to determine if exercise-induced wall motion abnormalities could be correlated with the presence and location of nonrevascularized vessels. Nonrevascularized vessels were defined as obstructed vessels without grafts, obstructed grafts or native vessels obstructed distal to bypass graft insertion. Adequate quality echocardiograms were recorded at rest, peak exercise and after exercise in 38 patients (90%). Rest and postexercise echocardiograms were adequate in 3 others. Only 1 patient was excluded from analysis for inadequate peak and postexercise echocardiograms. Exercise-induced wall motion abnormalities were present in 33 of 35 patients (94%) who had 1 or more nonrevascularized vessels and these abnormalities were absent in 5 of 6 (83%) who had all vessels revascularized. Wall motion abnormalities were localized to the territory of the left anterior descending (LAD) artery or to a combined right (R) coronary-left circumflex (LC) region of circulation. Exercise-induced wall motion abnormalities were present in 24 of 27 LAD artery regions (89%) and 23 of 26 R-LC regions (88%) that had nonrevascularized vessels. These abnormalities were absent in 13 of 14 LAD regions (93%) and in 12 of 15 R-LC regions (80%) that had only revascularized vessels. Upright bicycle exercise echocardiography was successfully performed after CABG. The technique detected and accurately localized nonrevascularized and revascularized vessels.