title: Six-month comparison of coronary endothelial dysfunction associated with sirolimus-eluting stent versus Paclitaxel-eluting stent.
abstract: OBJECTIVE
  This study was designed to investigate whether endothelial dysfunction is related to drug-eluting stent (DES) implantation at 6 months after stenting.
  
  
  BACKGROUND
  Current available DES could delay vessel healing and subsequently impair endothelial function.
  
  
  METHODS
  Endothelial function was estimated at 6-month follow-up in 75 patients (31 men, mean age 62.1 years) with a DES (39 sirolimus-eluting stents [SES], 36 paclitaxel-eluting stents [PES]), and 10 patients with a bare-metal stent (BMS) to the left anterior descending artery, by incremental acetylcholine (Ach) infusion (20 microg/min, 50 microg/min, 100 microg/min) and nitrate (200 microg/min) into the left coronary ostium. Vascular responses were quantitatively measured in arterial segments 5 mm proximal and distal to DES and compared with corresponding segments in the BMS group and midsegments in the left circumflex artery as a reference nonstented artery. All antianginal agents were withheld for at least 72 h before coronary angiography.
  
  
  RESULTS
  Greater vasoconstriction to Ach was observed in both the SES and PES groups than in the BMS group or control segments of left circumflex artery. Vasoconstriction to Ach was more prominent in arterial segments distal to stents in both SES and PES groups compared with those in the BMS group (p < 0.001). The degree of vasoconstriction to Ach was similar between the SES and PES groups. Endothelium-independent vasodilatation to nitrate did not differ significantly between the study groups.
  
  
  CONCLUSIONS
  Abnormal vasoconstriction to Ach was found in the SES and PES groups, especially in arterial segments distal to DES at 6 months after stenting, which suggests that DES has a potential long-term adverse effect on local coronary endothelial dysfunction.
authors.affiliation: Cardiovascular Center, Korea University, Guro Hospital, 97 Gurodong-Gil, Guro-gu, Seoul, Republic of Korea.
authors.forename: Jin Won
authors.initials: JW
authors.lastname: Kim
authors.forename: Soon Yong
authors.initials: SY
authors.lastname: Suh
authors.forename: Cheol Ung
authors.initials: CU
authors.lastname: Choi
authors.forename: Jin Oh
authors.initials: JO
authors.lastname: Na
authors.forename: Eung Ju
authors.initials: EJ
authors.lastname: Kim
authors.forename: Seung-Woon
authors.initials: SW
authors.lastname: Rha
authors.forename: Chang Gyu
authors.initials: CG
authors.lastname: Park
authors.forename: Hong Seog
authors.initials: HS
authors.lastname: Seo
authors.forename: Dong Joo
authors.initials: DJ
authors.lastname: Oh
mesh_terms: D015906:Angioplasty, Balloon, Coronary / Q000295:instrumentation*; D000972:Antineoplastic Agents, Phytogenic / Q000494:pharmacology; D017023:Coronary Angiography; D023921:Coronary Stenosis / Q000175:diagnosis / Q000503:physiopathology / Q000601:surgery; D003331:Coronary Vessels / Q000187:drug effects / Q000503:physiopathology*; D054855:Drug-Eluting Stents; D004562:Electrocardiography; D004730:Endothelium, Vascular / Q000187:drug effects / Q000503:physiopathology*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D007166:Immunosuppressive Agents / Q000494:pharmacology; D008297:Male; D008875:Middle Aged; D017239:Paclitaxel / Q000494:pharmacology*; D011474:Prosthesis Design; D012189:Retrospective Studies; D020123:Sirolimus / Q000494:pharmacology*; D013997:Time Factors; D018084:Ultrasonography, Interventional; D014661:Vasoconstriction / Q000187:drug effects / Q000502:physiology*
chemical_list: D000972:Antineoplastic Agents, Phytogenic; D007166:Immunosuppressive Agents; D017239:Paclitaxel; D020123:Sirolimus