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[Coronary flow reserve and stenosis as the determinant of exercise capacity in patients with stable effort angina]
Insights
Coronary flow reserve, not stenosis degree, predicts exercise capacity in stable angina patients. Percutaneous coronary intervention (PTCA) improved coronary flow reserve, enhancing exercise ability.
Area of Science:
- Cardiology
- Vascular Physiology
Context:
- Stable effort angina and single-vessel disease of the left anterior descending artery present diagnostic challenges.
- Accurate assessment of coronary artery function is crucial for managing ischemic heart disease.
Purpose:
- To evaluate coronary flow reserve (CFR) in patients with stable effort angina.
- To assess the relationship between CFR, exercise capacity, and coronary stenosis severity.
- To determine the impact of percutaneous transluminal coronary angioplasty (PTCA) on CFR.
Summary:
- Coronary flow reserve was measured using a Doppler flow probe and reactive hyperemia in 33 patients.
- A strong correlation was found between CFR and exercise capacity, while stenosis degree showed a poor correlation.
- PTCA improved CFR, underscoring its importance beyond anatomical stenosis assessment.
Impact:
- Coronary flow reserve is a more reliable indicator of functional impairment than anatomical stenosis in stable angina.
- These findings suggest CFR assessment should be integrated into the evaluation of ischemic heart disease.
- Improved CFR post-PTCA correlates with enhanced exercise capacity, guiding treatment efficacy.
Abstract:
The coronary flow reserve was evaluated in 33 patients with stable effort angina and single vessel disease of the left anterior descending artery. We used a catheter-tip Doppler flow probe with injection of contrast media to the vessel in order to induce so-called reactive hyperemia. The reactive change was used as an index of the flow reserve of the coronary artery. In 15 patients out of 33, PTCA was performed and the change in the coronary flow reserve was evaluated. There was a good correlation between the coronary flow reserve and the exercise capacity in the treadmill ECG exercise test. As theoretically expected, the exercise capacity was determined by the coronary flow reserve. There was a poor correlation between the degree of stenosis shown in coronary arteriography and the coronary flow reserve. The degree of stenosis did not relate with the exercise capacity. The coronary flow reserve was increased with the procedure of PTCA. Though the patho-anatomic findings in coronary angiography give us important information to evaluate patients with ischemic heart disease, we concluded that these findings were still insufficient to allow us to estimate the flow reserve in the coronary artery. The exercise capacity did not relate well with the degree of stenosis.