What is the maximum sheath size you can use for radial artery access?

What is the maximum sheath size you can use for radial artery access?

• A. 4F
• B. 5F
• C. 6F
• D. 7F

Answer: (C)

Matching the sheath size to the radial artery diameter is the key idea. The radial artery in adults is typically about 2.0 to 2.5 mm in diameter, and using a sheath that’s too large increases the risk of vasospasm, arterial injury, and radial artery occlusion. A six-French sheath is the standard maximum size used for most transradial procedures because it fits the typical artery well while still allowing a wide range of interventional devices. A seven-French sheath is larger and commonly exceeds the vessel’s caliber in many patients, raising complication risk; it’s generally reserved for select cases with unusually large radial arteries and careful technique.

Matching the sheath size to the radial artery diameter is the key idea. The radial artery in adults is typically about 2.0 to 2.5 mm in diameter, and using a sheath that’s too large increases the risk of vasospasm, arterial injury, and radial artery occlusion. A six-French sheath is the standard maximum size used for most transradial procedures because it fits the typical artery well while still allowing a wide range of interventional devices. A seven-French sheath is larger and commonly exceeds the vessel’s caliber in many patients, raising complication risk; it’s generally reserved for select cases with unusually large radial arteries and careful technique.