PCI complications: restenosis

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Editors-In-Chief: Alexandra Almonacid M.D. and Jeffrey J. Popma M.D.

Restenosis Pattern

In the setting of in-stent restenosis (ISR) after bare metal stent (BMS) implantation, the risk of recurrence can be predicted by the pattern of restenosis (1, 2).

Classification System


Table 1. Mehran Classification System (1)


  • Pattern I: Focal (≤ 10 mm in length) lesions
    • Ia : Restenosis within the stent
    • Ib : Restenosis at the edge of the stent
    • Ic : Restenosis at the articulation or gap
    • Id : Restenosis multifocal
  • Pattern II: ISR >10 mm within the stent
  • Pattern III: Includes ISR > 10 mm extending outside the stent
  • Pattern IV: ISR totally occluded

Implications

The need for recurrent target lesion revascularization (TLR) increased with increasing ISR class, increasing from 19%, 35%, 50%, to 83% in classes I to IV, respectively (P <0.001) (1).

Restenosis after drug eluting stent implantation is generally more focal than following bare metal stent placement (3, 4), and, with the sirolimus-eluting stent, more is commonly at the margin of the stent due to balloon injury that is not covered with stent (3, 5).

References

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  1. ref1 pmid=10545431 This is free space so that you can describe the reference if you want
  2. ref2 pmid=16504631 This is free space so that you can describe the reference if you want
  3. ref3 pmid=15596568 This is free space so that you can describe the reference if you want
  4. ref4 pmid=12719283 This is free space so that you can describe the reference if you want
  5. ref5 pmid=12860901 This is free space so that you can describe the reference if you want

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