Introduction: The transradial approach is the standard for percutaneous coronary intervention (PCI). Moreover, to lead to the evolution of PCI, a new approach site was developed, namely the distal radial approach (dRA).
Anatomy And Vessel Diameter: The vessel diameter of the distal radial artery is smaller than that of the forearm radial artery; hence, use of 1 Fr size or a sheath with a thinner outer diameter is recommended. Ultrasound examination before the procedure provides useful information on this matter.
Puncture: There are two approaches to puncture: proximal site puncture of the distal radial artery and distal site puncture. Based on anatomical characteristics, the puncture angle is large on the former and small on the latter. Although a learning curve for the dRA puncture is needed, the use of ultrasound facilitates the process.
Hemostasis: Using a hemostatic device dedicated to the dRA simplifies observation after PCI. Hemostatic devices for the conventional radial approach or simple bandage with an elastic band can be useful. Usually, less hemostasis time is needed for the dRA compared with the conventional radial approach.
Success Rate: Studies have shown high success rates of the dRA (approximately 88-99.5%).
Advantages And Disadvantages: Advantages of the dRA are patient comfort, short hemostasis time, less restraint for the patients after PCI, and easy observation at the ward. Disadvantages are the learning curve required for the puncture and the small diameter of the distal radial artery.
Conclusion: The dRA is a new approach site for PCI. Further research is warranted for the selection of suitable patients to undergo PCI through the dRA.
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