Table 2

Possible Mechanisms of Restenosis After DES

Biological factors
 Drug resistance
 Hypersensitivity
Mechanical factors
 Stent underexpansion
 Nonuniform stent strut distribution
 Stent fracture
 Nonuniform drug elution/deposition
 Polymer peeling
Technical factors
 Barotrauma outside stented segment
 Stent gap
 Residual uncovered atherosclerotic plaques