What is the restenosis rate associated with a bare metal stent?

• A. >50%
• B. <20%
• C. <8%
• D. 30-50%

Answer: (B)

Restenosis after a bare-metal stent happens mainly because of neointimal hyperplasia inside the stented segment, which narrows the lumen over months after implantation. Angiographic restenosis is typically defined as 50% or greater narrowing within the stent. Historically, the rate of this in-stent restenosis with bare-metal stents is around the low 20% range—roughly one in five patients show significant narrowing. Among common answer options, the closest match is a rate under 20%, since much higher figures (30–50% or more) are less typical, and rates under 8% would substantially understate the issue. Remember that exact numbers vary by study and definition, and clinically significant reinterventions can be lower than the angiographic restenosis rate, but neointimal hyperplasia commonly places bare-metal stent restenosis around the ~20% mark.