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.