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Prognostic value of exercise echocardiography in patients after coronary artery bypass surgery
A M Arruda1, R B McCully, J K Oh
1Division of Cardiovascular Diseases and Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
Insights
Exercise echocardiography offers valuable prognostic insights for patients post-coronary artery bypass surgery. It improves prediction of cardiac events beyond traditional clinical and electrocardiographic assessments.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Preventive Medicine
Background:
- Patients with prior coronary artery bypass surgery (CABS) require ongoing risk stratification.
- Traditional assessment methods may not fully capture post-surgical cardiac risk.
- Exercise echocardiography is a non-invasive tool to evaluate cardiac function under stress.
Purpose of the Study:
- To determine the prognostic value of exercise echocardiography in patients after CABS.
- To assess if exercise echocardiography provides incremental predictive information beyond established clinical and electrocardiographic markers.
Main Methods:
- A cohort of 718 patients (mean age 67 years) who underwent clinically indicated exercise echocardiography 5.7 years post-CABS were followed.
- Resting and exercise-induced wall motion abnormalities were assessed.
- Cardiac events (cardiac death, nonfatal myocardial infarction) were recorded over a median follow-up of 2.9 years.
Main Results:
- Resting wall motion abnormalities were present in 67% of patients; 51% developed new/worsening abnormalities during exercise.
- Exercise echocardiographic variables (abnormal left ventricular end-systolic volume response, exercise ejection fraction) significantly improved prediction models.
- The addition of exercise echocardiography enhanced the prediction of overall cardiac events and cardiac death (p < 0.02).
Conclusions:
- Exercise echocardiography provides significant prognostic information in patients following coronary artery bypass surgery.
- This modality offers incremental predictive value beyond clinical, resting echocardiographic, and exercise electrocardiographic data.
- Incorporating exercise echocardiography can refine risk stratification and guide management in post-CABS patients.
Abstract:
To assess the prognostic value of exercise echocardiography in patients with prior coronary artery bypass surgery, follow-up was obtained in 718 patients (591 men [82%] and 127 women [18%], aged 67 +/- 9 years) who underwent clinically indicated exercise echocardiography 5.7 +/- 4.7 years after coronary bypass surgery. Resting wall motion abnormalities were present in 479 patients (67%). New or worsening wall motion abnormalities developed with exercise in 366 patients (51%). During a median follow-up of 2.9 years, cardiac events included cardiac death in 36 patients and nonfatal myocardial infarction in 40 patients. The addition of the exercise echocardiographic variables, abnormal left ventricular end-systolic volume response and exercise ejection fraction to the clinical, resting echocardiographic and exercise electrocardiographic model provided incremental information in predicting cardiac events (chi-square 37 to chi-square 42, p = 0.02) and cardiac death (chi-square 38 to chi-square 43, p <0.02). Exercise echocardiography provides prognostic information in patients after coronary artery bypass surgery, incremental to clinical, rest echocardiographic, and exercise electrocardiographic variables.