Scavenging free radicals improves endothelial dysfunction in human coronary arteries in vivo

Heart and Vessels
Jun-ichi OyamaNaoki Makino

Abstract

The effect of a novel free radical scavenger, edaravone, on coronary endothelial dysfunction was examined in patients who had no significant stenosis of coronary arteries, to elucidate the role of free radicals on coronary endothelial dysfunction. The coronary blood flow (CBF) responses to acetylcholine (ACh) were measured by quantitative coronary arteriography and the intracoronary Doppler technique before and after the administration of edaravone. Twenty-four patients were divided into two groups on the basis of CBF responses to ACh; those with "attenuated" (%Delta CBF < 300%, n = 12) and "normal" (%Delta CBF > 300%, n = 12) flow responses. An intracoronary infusion of edaravone significantly improved ACh-induced increases in CBF in patients with attenuated flow responses; however, edaravone had no effect in those with normal flow responses (36.8% +/- 7.3% vs 0.0% +/- 5.1%, P < 0.01). The plasma levels of nitric oxide compounds (NOx) in the attenuated response group were lower than those in the normal group (35.7 +/- 2.3 vs 49.4 +/- 6.2 muM, P < 0.01) and correlated with the magnitude of CBF improvement by edaravone (r = 0.566, P < 0.01). The plasma level of malondialdehyde and 4-hydroxynonenal, which indicates the level of o...Continue Reading

References

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Related Concepts

Coronary Circulation
Sodium Malondialdehyde
Isoket
Phenylmethylpyrazolone
Blood Flow Velocity
Coronary Artery Disease
4-hydroxy-2-nonenal, (E)-isomer
Free Radicals
MCI 186
Fuchs Endothelial Dystrophy

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