| Effects of doxazosin on exercise-induced angina pectoris, ST-segment depression, and insulin sensitivity in patients with syndrome X. | |
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MedLine Citation:
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PMID: 9856918 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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A significant proportion of patients with cardiac syndrome X have impaired coronary vasodilator capacity, which is thought to be caused by an increased sympathetic drive. The alpha1-adrenoceptor blocker, doxazosin, increases the coronary vasodilator reserve in patients with syndrome X. To study whether the augmentation is associated with clinical improvement in patients, we conducted a double-blind, placebo controlled, crossover study with doxazosin 1 to 4 mg once daily for 10 weeks in 16 patients with syndrome X (14 women and 2 men; mean +/- SD age 56+/-5 years). Time to angina, exercise duration, time to 0.1 mV ST-segment depression, and maximal ST-segment depression during bicycle exercise testing were compared after treatment with doxazosin 2 mg or placebo for 5 weeks and again after treatment with doxazosin 4 mg or placebo for 10 weeks. Insulin sensitivity was assessed by the minimal model after 10 weeks of doxazosin or placebo treatment. Twelve patients completed the protocol. Doxazosin 4 mg/day decreased systolic blood pressure at rest (109+/-16 vs 125+/-18 mm Hg, p <0.05) and increased basal heart rate (85+/-9 vs 76+/-11 beats/min, p <0.05), whereas hemodynamics were unaffected during exercise. Time to angina, exercise duration, time to 0.1 mV ST-segment depression, and maximal ST-segment depression were similar during treatment with doxazosin and placebo irrespective of the doxazosin dose. Insulin sensitivity was not different with doxazosin and placebo. In conclusion, alpha1 blockade does not significantly improve exercise duration, angina pectoris, and ST-segment depression despite a favorable vasodilator effect in patients with syndrome X. The absent clinical efficacy of doxazosin may challenge the use of the coronary vasodilator capacity as an appropriate method to subclassify patients with syndrome X. |
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Authors:
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H E Bøtker; H S Sonne; O Schmitz; T T Nielsen |
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Publication Detail:
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Type: Clinical Trial; Journal Article; Randomized Controlled Trial; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: The American journal of cardiology Volume: 82 ISSN: 0002-9149 ISO Abbreviation: Am. J. Cardiol. Publication Date: 1998 Dec |
Date Detail:
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Created Date: 1998-12-21 Completed Date: 1998-12-21 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0207277 Medline TA: Am J Cardiol Country: UNITED STATES |
Other Details:
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Languages: eng Pagination: 1352-6 Citation Subset: AIM; IM |
Affiliation:
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Department of Cardiology, Skejby Hospital, University Hospital in Aarhus, Denmark. skejhb@aau.dk |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Adrenergic alpha-Antagonists
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therapeutic use* Blood Glucose / analysis Cross-Over Studies Double-Blind Method Doxazosin / therapeutic use* Exercise Female Glucose Tolerance Test Humans Insulin / blood, diagnostic use Male Microvascular Angina / blood, drug therapy*, etiology, physiopathology Middle Aged |
| Chemical | |
Reg. No./Substance:
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0/Adrenergic alpha-Antagonists; 0/Blood Glucose; 11061-68-0/Insulin; 74191-85-8/Doxazosin |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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