[Recanalization of occluded coronary arteries using the Magnum system].

Recanalization procedures with the "Magnum" system were undertaken in 137 patients (113 men, 24 women; mean age 57.1 +/- 8.1 years) with complete occlusion of a coronary artery. The system consists of a 0.021 inch guidewire with a flexible 1 mm diameter olive tip, a double-lumen probing catheter and a Magnarail balloon catheter. Chronic coronary artery occlusion of maximally 3 months was present in 51 patients (37%), for over 3 months in 52 (38%), while the duration of occlusion was unknown in 18 (13%). An acute coronary occlusion was successfully recanalized in 7 patients (5%), while in 9 (7%) it was accomplished when it had occurred during or shortly after a percutaneous coronary artery angioplasty (PCTA). The occlusion was successfully passed in 87 patients (64%); in 15 of them recanalization with another system had failed. The highest success rates were obtained with an acute occlusion (5 of 7; 71%), occlusion of 3 months' duration or less (39 of 51; 76%), and occlusion during PTCA (8 of 9; 89%). The success rates were lower for occlusions over 3 months' duration (25 of 52; 48%; P < 0.05) and of unknown duration (10 of 18; 56%; n.s.). Recanalization after failed recanalization was successfully accomplished by rotation-angioplasty (n = 2) or a standard system (n = 4).--These results indicate that the Magnum system is suitable for recanalizing chronic or acute coronary occlusion. But cardiologists should be capable of using several systems to increase the chances of successful recanalization.