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Coronary angioplasty ameliorates hypoperfusion-induced endothelial dysfunction in patients with stable angina
T Komaru1, S Isoyama, N Sekiguchi
1First Department of Internal Medicine, Tohoku University School of Medicine, Sendai, Japan.
Insights
Coronary angioplasty improves endothelial dysfunction caused by chronic hypoperfusion in patients with coronary heart disease. This improvement in endothelial function was observed within three months post-procedure.
Area of Science:
- Cardiovascular Medicine
- Endothelial Function Research
- Interventional Cardiology
Background:
- The endothelium plays a crucial role in regulating organ blood flow.
- Ischemia can lead to endothelial dysfunction.
- Chronic hypoperfusion may impair endothelial function in coronary arteries distal to stenosis.
Purpose of the Study:
- To investigate the impact of coronary angioplasty on chronic hypoperfusion-induced endothelial dysfunction.
- To test if chronic hypoperfusion impairs endothelial function in the distal coronary artery segment.
- To determine if angioplasty reduces this impairment.
Main Methods:
- Substance P and nitroglycerin infusions in coronary arteries of patients with stable angina.
- Quantitative coronary angiography to assess vascular diameter changes proximal and distal to lesions.
- Measurement of transstenotic pressure gradient before angioplasty.
Main Results:
- Endothelium-dependent vasodilation (substance P) was reduced in distal segments post-angioplasty, correlating with stenosis severity.
- Nitroglycerin-induced vasodilation showed no difference between proximal and distal segments.
- Impaired distal segment response to substance P normalized within 3 months.
Conclusions:
- Chronic hypoperfusion impairs endothelium-dependent dilation in coronary arteries distal to critical stenosis.
- Coronary angioplasty effectively ameliorates this endothelial dysfunction within three months.
Objectives:
This study sought to investigate the effect of coronary angioplasty on chronic hypoperfusion-induced endothelial dysfunction in patients with coronary heart disease.
Background:
The endothelium is an important component for organ flow regulation. Ischemia with or without reperfusion is known to cause endothelial dysfunction. We tested the hypothesis that chronic hypoperfusion impairs endothelial function in the angiographically normal coronary artery segment distal to stenosis and that the impairment by chronic hypoperfusion is reduced by coronary angioplasty.
Methods:
In 13 patients with stable angina pectoris, substance P (10, 30 and 100 pmol) and nitroglycerin (200 micrograms) were sequentially infused into the coronary artery in a cumulative manner on the day after coronary angioplasty. In 10 of these patients, vascular responses to these agents were again investigated 3 months after angioplasty. Changes in vascular diameter were evaluated in vessels located proximal and distal to the target lesion, both of which were angiographically normal, by performing computer-assisted quantitative coronary angiography. In five patients, the transstenotic pressure gradient was also measured with a pressure sensor-mounted guide wire before angioplasty.
Results:
On the day after angioplasty, the magnitude of dilation by substance P in distal segments was significantly less than that in proximal segments and inversely correlated with the transstenotic pressure gradient (p < 0.05) and lesion stenosis (p < 0.05). There was no difference in nitroglycerin-induced vasodilation between the two vessel segment groups. Three months later, the impaired response to substance P in the distal segment was restored to normal.
Conclusions:
We conclude that chronic hypoperfusion impairs endothelium-dependent dilation of coronary artery distal to critical stenosis in patients with ischemic heart disease and that coronary angioplasty ameliorates the endothelial dysfunction within 3 months.