Dipyridamole-induced myocardial ischemia

Area of Science:

• Cardiology
• Pharmacology

Background:

• Dipyridamole is used to assess myocardial perfusion.
• Myocardial ischemia can be induced by dipyridamole in patients with coronary artery disease.

Observation:

• Four patients awaiting myocardial revascularization developed angina and ischemic ECG changes after oral dipyridamole administration.
• These patients had epicardial coronary collateral vessels.

Findings:

• This is the first reported instance of dipyridamole-induced ischemia as a side effect of preoperative therapy.
• A coronary "steal" phenomenon is the suspected mechanism for the observed ischemia.

Implications:

• Clinicians should be aware of this potential side effect of dipyridamole.
• Further research is needed to understand the implications for patients with coronary collateral circulation.