Why is hypertension a factor in causing chronic renal failure?

HTN and CRF: Renal failure is one of several complications of longstanding hypertension which has not been adequately treated. It does this by damaging the kidneys so that they don't function properly. Once renal failure has occurred it may not be reversible, but strict control of blood pressure can slow the progression.

Scarring: Hypertension is one of the leading causes of kidney failure.Hypertension causes scarring in the kidney which leads to decreased function.