The angiographic and clinical benefits of mibefradil in the coronary slow flow phenomenon

Journal of the American College of Cardiology
John F BeltrameJohn D Horowitz

Abstract

The aim of the study was to assess the angiographic and clinical benefits of the calcium T-channel blocker, mibefradil, in the coronary slow flow phenomenon (CSFP). The CSFP is characterized by delayed vessel opacification on angiography (Thrombolysis In Myocardial Infarction [TIMI]-2 flow) in the absence of obstructive epicardial coronary disease and is often associated with recurrent chest pain. A total of 10 CSFP patients (46 +/- 9 years) underwent angiography before and 30 min after 50 mg mibefradil; off-line blinded analysis of angiographic data included comparisons of epicardial vessel diameter, TIMI flow grade and TIMI frame count. We also performed a randomized, double-blind, placebo-controlled, cross-over study to examine the long-term efficacy of mibefradil 100 mg/day on the frequency of total angina, prolonged angina (i.e., persisting >20 min) episodes, and sublingual nitrate consumption, during consecutive one-month treatment periods in 20 patients (age 51 +/- 12 years) with the CSFP. Without changing epicardial vessel diameter or rate-pressure product, mibefradil reduced the number of vessels exhibiting TIMI-2 flow from 18 to 5; furthermore, mibefradil significantly improved the TIMI frame count only in those vesse...Continue Reading

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Citations

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