Related Experiment Videos
[Dipyridamole-echocardiography test in the diagnosis of vasomotor angina]
U Baldini1, F L Dini, M Marchetti
1Reparto di Cardiologia e UTIC, Spedali Riuniti, Livorno.
Insights
Dipyridamole-atropine stress testing diagnoses coronary artery disease by inducing ischemia. Aminophylline infusion can trigger coronary artery spasms, enhancing diagnostic accuracy in specific cases.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Pharmacology
Background:
- Dipyridamole-atropine echocardiography is a standard stress test for diagnosing coronary artery disease (CAD).
- It induces myocardial ischemia through vasodilation, increased oxygen demand, and reduced oxygen supply.
- Aminophylline is used to reverse dipyridamole's effects and can potentially trigger coronary artery spasms.
Observation:
- Two patients with rest angina and normal coronary arteries were studied.
- Coronary artery spasm was successfully induced by aminophylline administration during the stress test.
- This suggests aminophylline's role in unmasking variant angina.
Findings:
- Aminophylline can induce coronary artery spasms in patients with suspected variant angina.
- This phenomenon enhances the diagnostic capability of dipyridamole-atropine stress testing.
- The test effectively identifies "organic" coronary artery disease and variant angina.
Implications:
- Aminophylline-induced spasms can improve the diagnostic yield of stress echocardiography.
- This approach may aid in diagnosing coronary artery disease, particularly variant angina.
- Further research could refine the use of aminophylline in stress testing protocols.
Abstract:
Dipyridamole-atropine echocardiography testing is used extensively for the diagnosis of coronary artery disease and it is highly effective in diagnosing "organic" coronary artery disease by inducing myocardial ischemia via three different mechanisms: maximal coronary artery vasodilatation with phoenomena of flow-maldistribution caused by dipyridamole, increase in myocardial oxygen consumption and reduction of the oxygen supply to the myocardium caused by atropine. Moreover, the abrupt withdrawal of the coronary artery vasodilatation caused by aminophylline, which is routinely infused at the end of the test, may trigger coronary artery spasms in patients with variant angina, thus enhancing the diagnostic power of the test. We report two clinical cases of patients with rest angina and angiographically normal coronary arteries, in whom coronary artery spasm was induced by administering aminophylline during the stress test.