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Noninvasive external cardiac pacing for thallium-201 scintigraphy
M D Feldman1, S E Warren, E V Gervino
1Department of Internal Medicine, Charles A. Dana Research Institute, Boston, Massachusetts.
American Journal of Physiologic Imaging
|January 1, 1988
Summary
Noninvasive cardiac pacing combined with thallium scintigraphy effectively detects coronary artery disease. This pacing stress test shows comparable results to exercise testing, offering an alternative for patients unable to exercise.
Area of Science:
- Cardiology
- Nuclear Medicine
- Diagnostic Imaging
Background:
- Noninvasive external cardiac pacing offers reliable electrical capture with manageable patient discomfort.
- Assessing coronary artery disease (CAD) noninvasively is crucial for chest pain management.
Purpose of the Study:
- To evaluate noninvasive cardiac pacing combined with thallium scintigraphy as a noninvasive pacing stress test.
- To compare the diagnostic accuracy of this novel stress test with traditional exercise thallium scintigraphy.
Main Methods:
- Fourteen patients with chest pain syndromes underwent simultaneous noninvasive cardiac pacing, hemodynamic monitoring, and thallium-201 scintigraphy.
- Patients were paced to over 85% of their age-predicted maximum heart rate.
- Thallium scintigraphic responses were compared to exercise thallium stress tests in a subset of patients.
Main Results:
- Twelve patients showed reversible thallium defects, correlating with significant coronary artery disease in 11 cases.
- Thallium imaging results from pacing stress tests were comparable to exercise stress tests.
- Local patient discomfort was noted as a limiting factor in all participants.
Conclusions:
- Noninvasive external cardiac pacing with thallium scintigraphy can detect significant coronary artery disease.
- This method may be a viable alternative to exercise stress testing, especially for patients with exercise limitations.
- Further technological improvements are needed to minimize patient discomfort.