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The "hairpin" wire technique. A) Illustration of how to form a “hairpin” on a coronary wire. B) A hairpin shape on a wire is used to enter an acute marginal branch. The hairpin is advanced past the branch and is then withdrawn, unfolding and entering the branch. Reproduced with permission from: Brilakis ES. Manual of Coronary Chronic Total Occlusion Interventions. A Step-By-Step Approach. 2nd edition. Amsterdam, the Netherlands: Elsevier; 2017.
