Background: The aim of this study was to compare the impact of transradial catheterization with hydrophilic-coated catheter sheaths versus uncoated sheaths on NO-mediated endothelial-dependent and -independent vasodilator function.
Methods and results: Thirty-five subjects undergoing transradial catheterization were recruited and assessed before and the day after catheterization. A subgroup was also assessed 3 to 4 months after catheterization. Subjects received hydrophilic-coated sheaths (n=15) or uncoated sheaths (n=20). Radial artery flow-mediated dilatation and endothelium- and NO-dependent arterial dilatation were assessed within the region of sheath placement. Glyceryl trinitrate endothelium-independent NO-mediated function was also assessed. The noncatheterized arm provided an internal control. Flow-mediated dilatation in the catheterized arm decreased from 10.3+/-3.8% to 5.3+/-3.3% and 8.1+/-2.4% to 5.2+/-3.7% in the coated and uncoated groups, respectively (P<0.01). These values returned toward baseline levels approximately 3 months later (coated, 6.4+/-1.4%; uncoated, 9.4+/-4.1%; P<0.05) versus postprocedure. Glyceryl trinitrate decreased from 14.8+/-7.2% to 9.5+/-4.1% (P<0.05) in the coated group and from 12.2+/-4.6% to 7.5+/-4.2% (P<0.01) in the uncoated group. Values returned to baseline at approximately 3 months (coated, 16.6+/-5.6%; uncoated, 12.1+/-3.9%; P<0.05). There was no difference in the magnitude of decrease in flow-mediated dilatation or glyceryl trinitrate between coated and uncoated groups. No changes in function occurred in the noncatheterized arm.
Conclusions: Placement of a catheter sheath inside the radial artery disrupts vasodilator function, which recovers after 3 months. No differences were evident between hydrophilic-coated and uncoated sheaths.