PURPOSE: To investigate the average stent length and the average stent diameter in patients having bare-metal stents (BMS) and in patients having drug-eluting stents (DES) implanted during percutaneous coronary intervention (PCI).
METHODS: During the 2-month period of January 1-February 28, 2003, 191 patients, mean age 63 years, undergoing PCI had 301 BMS implanted. During the 2-month period of January 1- February 28, 2004, 180 patients, mean age 63 years, undergoing PCI had 270 DES implanted. Student's t tests were used to measure continuous variables. Chi-square tests were used to measure dichotomous variables.
RESULTS: Mean age, gender, race, prevalence of diabetes mellitus, prevalence of acute myocardial infarction, and mean left ventricular ejection fraction was not significantly different between the two groups.Stent location in right coronary artery, left anterior descending coronary artery, left circumflex coronary artery, and ramus intermedius coronary artery was similar for the two groups. Ten of 301 BMS (3%) and 1 of 270 DES (<1%) had a stent in a graft (p=0.01). The average stent length was 15.45 mm in BMS and 16.83 mm in DES (p=0.0026). The average stent diameter was 3.00 mm in BMS and 2.89 mm in DES (p=0.00027). The niumber of stents per patient was 1.58 for BMS and 1.50 for DES (p not significant). In-hospital stent thrombosis occurred in 3 of 301 BMS (1.0%) and in 1 of 270 DES (0.4%), p not significant.
CONCLUSION: The average stent length was significantly longer and the average stent diameter significantly smaller in patients receiving DES compared with BMS.
CLINICAL IMPLICATIONS: Both a longer stent length and a reduced stent diameter may contribute to a higher incidence of late-stent thrombosis in patients treated with DES. Therefore, these patients should be treated with aspirin and clopidogrel longer, possibly indefinitely if they are at increased risk for late-stent thrombosis.
DISCLOSURE: Kumar Kalapatapu, No Financial Disclosure Information; No Product/Research Disclosure Information