This leads them to release substances to raise the pressure, but it only rises substantially in the part of the circulation before the blockage. In this fashion, the heart and brain are still subjected to the very high pressures induced by the kidney's desire for more blood.
Coarctations generally require repair.
Dilating the segment with balloons is a possibility, particularly in the young. Surgical removal of the narrowed segment may need to be accomplished. Other abnormalities may co-exist, particularly abnormalities of the aortic valve.