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Exchange from diagnostic catheter to PCI guiding catheter under the extension guidewire use. (A) Guidewire is crossed through 5 French diagnostic catheter; (B) following the use of the extension guidewire, the diagnostic catheter is withdrawn; (C) PCI guiding catheter is advanced along the extension guidewire under the microcatheter support. PCI, percutaneous coronary intervention; LCX, left circumflex artery; LAD, left anterior descending artery.
