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Insensitivity of noninvasive tests to detect coronary artery vasculopathy after heart transplant
F W Smart1, C M Ballantyne, B Cocanougher
1Multi-Organ Transplant Center, Methodist Hospital, Houston, Texas 77030.
Insights
Noninvasive tests show low sensitivity for detecting cardiac transplant coronary artery vasculopathy. Echocardiography was most sensitive, but routine use for surveillance is not recommended due to poor predictive value.
Area of Science:
- Cardiology
- Transplant Medicine
- Medical Imaging
Background:
- Obstructive coronary artery vasculopathy is a significant complication following heart transplantation.
- Early detection is crucial for patient management and long-term outcomes.
Purpose of the Study:
- To evaluate the sensitivity and predictive value of various noninvasive tests for detecting coronary artery vasculopathy in heart transplant recipients.
- To determine the utility of routine noninvasive surveillance for this condition.
Main Methods:
- Prospective study of 73 heart transplant patients over 2.5 years.
- Yearly surveillance included echocardiography, gated wall motion studies, dipyridamole thallium scans, ambulatory ECG monitoring, and angiography.
- Positive test results defined by specific criteria for ejection fraction, wall motion, blood pressure response, and ischemic changes.
Main Results:
- Coronary artery disease was confirmed in 26% of patients.
- No noninvasive test demonstrated high sensitivity for detecting transplant coronary artery vasculopathy.
- Echocardiography showed the highest sensitivity (53%), but positive predictive values for most tests were below 50%.
Conclusions:
- Current noninvasive tests have limited sensitivity and predictive value for surveillance of coronary artery vasculopathy after heart transplant.
- The diagnostic limitations may stem from detecting ischemia effects rather than obstruction itself.
- Routine use of these noninvasive modalities for surveillance should be reconsidered.
Abstract:
Obstructive coronary artery vasculopathy can be a major problem after cardiac transplant. The use of noninvasive tests to detect coronary artery vasculopathy was studied in 73 consecutive patients after heart transplant. Angiographically or autopsy-proved coronary artery disease was noted in 19 consecutive patients (26%) followed prospectively for 2.5 +/- 1.3 years (mean +/- standard deviation). Patients underwent yearly surveillance echocardiographic, rest/exercise-gated wall motion, oral dipyridamole thallium, ambulatory electrocardiographic monitor and angiographic studies. Positive test results were defined by decrease in ejection fraction, wall motion abnormality, failure to increase ejection fraction, lack of systolic blood pressure increase, and ischemic ST changes at maximal exercise (or on ambulatory monitor). Wall motion abnormalities and depressed ejection fraction on echocardiography were also abnormal studies as were fixed or reversible perfusion defects on thallium scan. Angiograms were considered positive when 50% luminal narrowing was observed and autopsy coronary artery vasculopathy was defined as cross-sectional coronary obstruction greater than or equal to 70%. No procedure that was examined proved to be a sensitive noninvasive detector of heart transplant coronary artery vasculopathy. All except ambulatory electrocardiographic monitoring had positive predictive values less than 50%. Interestingly, of the techniques evaluated, echocardiography was most sensitive (53%). The poor predictive ability of noninvasive testing in this population may be due to the fact that these tests are designed to detect effects of ischemia rather than coronary obstruction alone. Use of these particular noninvasive modalities routinely after heart transplant to detect coronary artery vasculopathy should be reconsidered because of their low sensitivity and predictive value when used as a surveillance screen.