Hypertension is defined as a blood pressure (BP) ≥130/80 mm Hg. Hypertensive emergency (Table 6) is defined by a BP ≥180/110 mm Hg and signs and symptoms of severely elevated BP. The mechanisms that lead to severely elevated BP appear to be related to a failure of normal autoregulatory function resulting in increased vascular resistance caused by endogenous vasopressors in patients with unrecognized or under-treated hypertension; and/or following the administration of sympathomimetic drugs such as high doses of epinephrine.
Table 6. Hypertensive Emergency.
|Signs and symptoms:|