Why should there be acute nephritis hypertension?

80% - 90% of patients with acute nephritis may appear hypertension, Generally mild to moderate hypertension, adults often 130-160/90-110 mmHg (17-21/12-14kpa). Blood pressure volatile, showed a transient, occasionally severe hypertension, and with retinal hemorrhage, bleeding, edema or nipple as hypertensive encephalopathy. The resultant hypertension reasons: (1) As renal ischemia led to increased renin: Renin is a special kind of proteolytic enzymes, it will enable globulin in plasma activity of hypertension without changes in protein activity of hypertension with protein, hypertension protein produced by the liver, changes hypertension protein for a very strong after vascular contraction, thus enabling high blood pressure. (2) As allergy caused by the reflection of the systemic arteries spasm results. (3)increased blood volume, so that the blood pressure too high.