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Hypertension produced by renal disease.A simple explanation for renal vascular hypertension is that decreased perfusion of renal tissue due to stenosis of a main or branch renalartery activates the renin-angiotensin system.
Malignant hypertension (or accelerated hypertension) is distinct as a late phase in the condition, and may present with headaches, blurred vision and end-organ damage.
Hypertension is generally defined as a blood pressure reading greater than 140 over 90; presssures of 120–139 over 80–89 are now considered prehypertension.
Known as the "silent killer," hypertension often produces few overt symptoms; it may, however, result in damage to the heart, eyes, kidneys, or brain and ultimately lead to congestive heart failure congestive heart failure, inability of the heart to expel sufficient blood to keep pace with the metabolic demands of the body.
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