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[Adding atropine improves the diagnostic accuracy of dipyridamole-echo test]
L Lanzarini1, R Fetiveau, M Previtali
1Divisione di Cardiologia, IRCCS-Policlinico S. Matteo, Pavia.
Giornale Italiano Di Cardiologia
|September 1, 1994
Summary
Adding atropine to dipyridamole stress echocardiography significantly improves the diagnosis of coronary artery disease (CAD). This combined test enhances accuracy, especially for less severe CAD, and is well-tolerated.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Clinical Medicine
Background:
- Dipyridamole stress echocardiography has limitations in detecting coronary artery disease (CAD) with limited coronary reserve.
- Enhancing myocardial oxygen consumption may improve diagnostic accuracy for CAD.
Purpose of the Study:
- To evaluate the diagnostic accuracy of adding atropine to high-dose dipyridamole stress echocardiography for CAD detection.
- To assess the safety and tolerability of the combined dipyridamole-atropine stress test.
Main Methods:
- Fifty-two patients underwent dipyridamole-echo stress testing with subsequent coronary arteriography.
- Atropine was administered to patients without ischemia after dipyridamole, and left ventricular wall motion was analyzed.
- Peak heart rate was monitored throughout the stress tests.
Main Results:
- The dipyridamole-atropine echo stress test demonstrated higher sensitivity (76%) and diagnostic accuracy (75%) compared to dipyridamole alone (48% sensitivity, 52% accuracy).
- The combined test significantly improved detection of one-vessel CAD (sensitivity increased from 39% to 70%).
- The addition of atropine led to a higher peak heart rate and was well-tolerated with no limiting side effects.
Conclusions:
- Combining atropine with dipyridamole stress echocardiography enhances diagnostic accuracy for CAD, particularly in patients with less severe disease.
- This adjunctive chronotropic stress is a safe and effective method for optimizing the diagnostic value of dipyridamole-echo stress testing.