Renovascular hypertension is a condition in which high blood pressure is caused by the kidneys hormonal response to narrowing of the arteries supplying the kidneys. When functioning properly this hormonal axis regulates blood pressure. Due to low local blood flow, the kidneys mistakenly increase blood pressure of the entire circulatory system. It is a form of secondary hypertension - a form of hypertension whose cause is identifiable. Signs and symptoms
Symptoms of renovascular hypertension include the following:
High blood pressure (early age)
Kidney dysfunction
Narrowing of arteries elsewhere in the body
Pulmonary edema

Cause
The cause of renovascular hypertension is consistent with any narrowing/blockage of blood supply to the renal organ (renal artery stenosis). As a consequence of this action the renal organs release hormones that indicate to the body to maintain a higher amount of sodium and water, which in turn causes blood pressure to rise. Factors that may contribute are: diabetes, high cholesterol and advanced age, also of importance is that a unilateral
condition is sufficient to cause renovascular hypertension. Pathogenesis
The pathogenesis of renovascular hypertension involves the narrowing of the arteries supplying the kidneys which causes a low perfusion pressure that is detected by the juxtaglomerular apparatus (via the macula densa cells, which act as baroreceptors; located on the afferent arteriole wall).
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