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Depicts the transseptal approach by the Brockenbrough technique. (A) Shows the perforation of the atrial septum after contrast marking of the septal area; (B) demonstrates the trans-needle coronary wire placement within the left upper pulmonary vein; (C) the first balloon dilatation of the septum by an 8 mm × 30 mm Powerflex® balloon; (D) the final dilatation with a 12 mm × 30 mm high-pressure balloon.
