Abstract 4758: Multiple Inter-strut Hollow, a Unique Finding of Optical Coherence Tomography After Sirolimus Eluting Stent Implantation: The Prevalence and Clinical Characteristics
Background: It has been reported that Optical Coherence Tomography (OCT) revealed cavities formation between and outside of the stent strut, Multiple Inter-strut Hollow (MIH) after Sirorimus eluting stent (SES) implantation. However, the incidence and the clinical characteristics of MIH are unknown.
Methods: We analyzed the findings of OCT, in 60 cases with in-stent restenosis (ISR) after SES (n=52) and bare metal stent (BMS) (n=8) implantation. MIH was defined as multiple cavity formation which maximum depth was over 0.3mm between and outside of the stent strut in OCT. Furthermore, we examined the relation between the maximum depth of MIH and the clinical characteristics of the lesions with MIH, such as, original lesion type (AMI/UAP, stable AP, CTO or ISR) and period to restenosis (more than 1 year or less than 1 year).
Results: The incidence of MIH was significantly higher in SES group compared with BMS group (42.3% v.s. 0.0%; p<0.05) and also showed the tendency to increase in the group which original lesion type was CTO. Regarding the maximum depth of MIH, there was no significant difference between more and less than 1 year groups (0.62+−0.24mm v.s. 0.53+−0.12mm; p=0.34), however, the depth of MIH tended to increase in CTO group.
Conclusions: MIH is peculiar phenomenon after SES implantation on OCT findings. Further careful follow-up is needed to reveal the clinical implication of MIH.