4.3 Article

Poor Tolerance and Limited Effects of Isosorbide-5-Mononitrate in Microvascular Angina

Journal

CARDIOLOGY
Volume 130, Issue 4, Pages 201-206

Publisher

KARGER
DOI: 10.1159/000370027

Keywords

Microvascular angina; Isosorbide-5-mononitrate; Quality of life; Exercise stress test

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Objectives: To assess the effects of isosorbide-5-mononitrate (ISMN) in patients with microvascular angina (MVA). Methods: We randomized 20 MVA patients, treated with a beta-blocker or a calcium antagonist, to 60 mg slow-release ISMN (halved to 30 mg if not tolerated) or placebo once a day for 4 weeks; the patients were then switched to the other treatment for another 4 weeks. Their clinical status was assessed with the Seattle Angina Questionnaire (SAQ) and the EuroQoL score for quality of life. The exercise stress test (EST), coronary blood flow (CBF) response to nitrate and the cold pressor test (CPT), brachial artery flow-mediated dilation (FMD) and nitrate-mediated dilation (NMD) were also assessed. Results: Nine patients (45%) did not complete the ISMN phase due to side effects; 2 patients refused a follow-up. Nine patients completed the study. The SAQ and EuroQoL scores were significantly better with ISMN than with placebo, although the differences were small. No differences were found between the treatments in the EST results, CBF response to nitroglycerin (p = 0.55) and the CPT (p = 0.54), FMD (p = 0.26) and NMD (p = 0.35). Conclusions: In this study, a high proportion of MVA patients showed an intolerance to ISMN; in those tolerating the drug, significant effects on their angina status were observed, but the benefit appeared to be modest and independent of effects on coronary microvascular function. (C) 2015 S. Karger AG, Basel

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