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The transradial approach has been used for coronary procedures, but this procedure carries a risk of injury to the endothelium of the radial artery. In this study, the vascular dysfunction caused by transradial catheterization was examined using reactive hyperemia peripheral arterial tonometry (RH-PAT), a recently developed technique for assessing endothelial function in digits, and the differences in injuries were compared according to the size of sheath.Forty-three patients undergoing transradial catheterization with 6-Fr sheaths (n = 17) or 4-Fr/5-Fr (non-6-Fr; n = 26) sheaths underwent RH-PAT using an Endo-PAT2000 before, the day after, and 6 months after catheterization. RH-PAT was assessed in the arm of sheath placement and in the other arm as a control.RH-PAT values decreased from 2.42 ± 0.67 before catheterization to 2.08 ± 0.41 the day after catheterization in the 6-Fr group (P = 0.031); this was more evident in patients with a longer procedure time (&gt; 91 minutes). In contrast, the change in the non-6-Fr group was not significant. RH-PAT of the non-catheterized arm was unchanged in both groups. At 6 months after catheterization, RH-PAT values in the 6-Fr group had not completely returned to baseline.In conclusion, the insertion of a 6-Fr catheter sheath into the radial artery, especially with a longer procedure time, impaired vascular endothelial function assessed by RH-PAT the day after the procedure and was sustained for 6 months. Thus, the use of smaller size sheaths (&lt; 6-Fr) with a shorter procedure should be considered when performing transradial catheterization.

international heart journal

Impact of Catheter Sheath Insertion into the Radial Artery on Vascular Endothelial Function Assessed by Reactive Hyperemia Peripheral Arterial Tonometry