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Efficacy of a Device to Narrow the Coronary Sinus in Refractory Angina
104 patients with class III or IV angina who were not candidates for revascularization were randomized to a sham procedure or to placement of a coronary sinus narrowing device. 35% of those in the device group improved their angina 2 classes, and 71% improved by 1 class, compared to 15% and 42% in the sham group. Quality of life improved more in the treatment group. Improvement in exercise capacity and in ventricular wall motion were similar between the groups.