1. Revascularization. The patients randomized to this treatment will undergo digital scan angiography (DSA) and PTA with stenting of the renal artery. PTA will be performed at the ostium or at truncular level. Stenoses involving more distal arterial vessels will be recorded and considered for data analysis but will not be treated. The patients randomized to revascularization will continue on their antihypertensive drug regimen. The dose and number of drugs will be down-titrated with the aim of pursuing the target BP values.