Renovascular hypertension
| Renovascular hypertension | |
|---|---|
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| 3D rendered CT of abdominal aortic branches kidneys | |
| Classification and external resources | |
| Specialty | cardiology, nephrology |
| ICD-10 | I15.0 |
| ICD-9-CM | 403 |
| MedlinePlus | 000204 |
| eMedicine | med/2006 |
| MeSH | D006978 |
Renovascular hypertension (or "renal 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 increases blood pressure of the entire circulatory system. It is a form of secondary hypertension - a form of hypertension whose cause is identifiable.
Symptoms of renovascular hypertension include the following:
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.
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 juxtaglomerular cells, which act as baroreceptors; located on the afferent arteriole wall). This leads to renin secretion that causes the angiotensinogen conversion to angiotensin I. Angiotensin I then proceeds to the lung where it is converted to angiotensin II via angiotensin converting enzyme (ACE).
In most people fibromuscular dysplasia or atherosclerosis is the reason for the occlusion of a renal artery which ultimately leads to this condition.
The diagnosis for renovascular hypertension is done by:
In terms of treatment for renovascular hypertension surgical revascularization versus medical therapy for atherosclerosis, it is not clear if one option is better than the other according to a 2014 Cochrane review; balloon angioplasty did show a small improvement in blood pressure .
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