Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina.
OBJECTIVE: To assess the effects of intravenous vitamin C administration on the vasomotor responses to intracoronary L-arginine infusion in epicardial coronary arteries. METHODS: 28 patients with coronary artery disease and stable angina were enrolled in the study. Eight patients received intracoro...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
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2005
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| _version_ | 1826261161315663872 |
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| author | Tousoulis, D Xenakis, C Tentolouris, C Davies, G Antoniades, C Crake, T Stefanadis, C |
| author_facet | Tousoulis, D Xenakis, C Tentolouris, C Davies, G Antoniades, C Crake, T Stefanadis, C |
| author_sort | Tousoulis, D |
| collection | OXFORD |
| description | OBJECTIVE: To assess the effects of intravenous vitamin C administration on the vasomotor responses to intracoronary L-arginine infusion in epicardial coronary arteries. METHODS: 28 patients with coronary artery disease and stable angina were enrolled in the study. Eight patients received intracoronary infusions of 150 micromol/min L-arginine before and after intravenous infusion of vitamin C, 10 patients received intracoronary infusions of 150 micromol/min L-arginine before and after intravenous infusion of normal saline, and 10 patients received intracoronary normal saline before and after intravenous infusion of vitamin C. The diameter of proximal and distal coronary artery segments was measured by quantitative angiography. RESULTS: Infusion of L-arginine caused significant dilatation of both proximal (4.87 (0.96)%, p < 0.01 v normal saline) and distal (6.33 (1.38)%, p < 0.01 v normal saline) coronary segments. Co-infusion of vitamin C and L-arginine dilated proximal coronary segments by 8.68 (1.40)% (p < 0.01 v normal saline, p < 0.01 v L-arginine) and distal segments by 13.07 (2.15)% (p < 0.01 v normal saline, p < 0.01 v L-arginine). Intravenous infusion of vitamin C caused a borderline increase in proximal and distal coronary segment diameters (1.93 (0.76)% and 2.09 (1.28)%, respectively, not significant). CONCLUSIONS: L-arginine dependent coronary segment vasodilatation was augmented by the antioxidant vitamin C in patients with coronary artery disease. Thus, vitamin C may have beneficial effects on nitric oxide bioavailability induced by L-arginine. |
| first_indexed | 2024-03-06T19:17:11Z |
| format | Journal article |
| id | oxford-uuid:18cebdf1-8a7d-4bf4-bc8e-f07c6c947da4 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T19:17:11Z |
| publishDate | 2005 |
| record_format | dspace |
| spelling | oxford-uuid:18cebdf1-8a7d-4bf4-bc8e-f07c6c947da42022-03-26T10:45:15ZEffects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:18cebdf1-8a7d-4bf4-bc8e-f07c6c947da4EnglishSymplectic Elements at Oxford2005Tousoulis, DXenakis, CTentolouris, CDavies, GAntoniades, CCrake, TStefanadis, C OBJECTIVE: To assess the effects of intravenous vitamin C administration on the vasomotor responses to intracoronary L-arginine infusion in epicardial coronary arteries. METHODS: 28 patients with coronary artery disease and stable angina were enrolled in the study. Eight patients received intracoronary infusions of 150 micromol/min L-arginine before and after intravenous infusion of vitamin C, 10 patients received intracoronary infusions of 150 micromol/min L-arginine before and after intravenous infusion of normal saline, and 10 patients received intracoronary normal saline before and after intravenous infusion of vitamin C. The diameter of proximal and distal coronary artery segments was measured by quantitative angiography. RESULTS: Infusion of L-arginine caused significant dilatation of both proximal (4.87 (0.96)%, p < 0.01 v normal saline) and distal (6.33 (1.38)%, p < 0.01 v normal saline) coronary segments. Co-infusion of vitamin C and L-arginine dilated proximal coronary segments by 8.68 (1.40)% (p < 0.01 v normal saline, p < 0.01 v L-arginine) and distal segments by 13.07 (2.15)% (p < 0.01 v normal saline, p < 0.01 v L-arginine). Intravenous infusion of vitamin C caused a borderline increase in proximal and distal coronary segment diameters (1.93 (0.76)% and 2.09 (1.28)%, respectively, not significant). CONCLUSIONS: L-arginine dependent coronary segment vasodilatation was augmented by the antioxidant vitamin C in patients with coronary artery disease. Thus, vitamin C may have beneficial effects on nitric oxide bioavailability induced by L-arginine. |
| spellingShingle | Tousoulis, D Xenakis, C Tentolouris, C Davies, G Antoniades, C Crake, T Stefanadis, C Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title | Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title_full | Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title_fullStr | Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title_full_unstemmed | Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title_short | Effects of vitamin C on intracoronary L-arginine dependent coronary vasodilatation in patients with stable angina. |
| title_sort | effects of vitamin c on intracoronary l arginine dependent coronary vasodilatation in patients with stable angina |
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