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Figure 1 (A) A 20-pole multispine catheter. The spine A and B being recognized by radio-opaque markers (circled) for visualization with fluoroscopy. The marker on spine A is proximal to the external two electrodes, and on spine B distal to the internal two electrodes. (B) A multispine catheter deployed in the inferior left atrium. Quadripolar catheters are deployed in the left atrium and coronary sinus.
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