A life-threatening condition where blood pressure is too low to sustain life. Occurs when a low blood volume (due to severe
bleeding, excessive fluid loss or inadequate fluid uptake), inadequate pumping action of the heart or
of the blood vessel walls ( ) causes low blood pressure. This in turn
results in inadequate blood supply to body cells, which can quickly die or be irreversibly damaged.
The severest form of
which is a medical emergency. A
reaction according to the . An often severe and sometimes fatal systemic reaction in a susceptible
individual upon exposure to a specific (such as wasp venom or
following previous sensitization. Characterized especially by respiratory symptoms,
fainting, itching, , swelling of the throat or other
mucous membranes and a
sudden decline in blood pressure.