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[Collateral circulation during exercise-induced angina: evaluation by coronary angiography]
Journal of Cardiography
|December 1, 1986
Summary
Coronary collateral vessels often diminish during exercise-induced angina but remain stable after nitroglycerin administration. This suggests nitroglycerin prevents ischemia by maintaining collateral function during exertion.
Area of Science:
- Cardiology
- Vascular Biology
Background:
- The role of coronary collateral vessels in heart disease pathophysiology is debated.
- Previous studies have not definitively established their behavior during angina.
Observation:
- Coronary angiography visualized collateral vessel changes in 26 patients during ergometer stress tests.
- Collaterals diminished in most patients during exercise-induced angina before nitroglycerin.
- Nitroglycerin administration prevented collateral reduction during angina.
Findings:
- Coronary collateral patency is dynamic and can decrease during exercise-induced angina.
- A pressure gradient between coronary arteries influences collateral function.
- Nitroglycerin administration appears to stabilize collateral circulation during ischemic episodes.
Implications:
- Resting visualization of collaterals does not predict their function during angina.
- Exercise does not necessarily promote collateral circulation development.
- Nitroglycerin may be beneficial in preventing exercise-induced ischemia by preserving collateral flow.