The less invasive radial access for percutaneous coronary intervention (PCI) has gained the favour of interventionists for its advantage in reducing access site complications, improving patient comfort and reducing mortality. However, due to the smaller diameters of radial artery, the catheter size is therefore too large for some patients, which makes this technique painful, cumbersome and sometimes unsafe, also sets a limitation for complex PCI. In addition, radial artery occlusion (RAO) is more common when guides are large in comparison to the radial artery. This led to the development of series of downsized equipment and corresponding techniques to overcome this problem, which was so called “Slender” for this new approach.
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