[Hypertensive emergencies].

Hypertensive urgencies are common clinical occurrences in hypertensive patients. The definition of hypertensive urgencies (target blood pression) were not consistent, but involved often target end-organ damage in emergencies. Epidemiology and physiopathology are briefly described. Treatment practices of hypertensive crisis were difficult because of the lack of evidence supporting the use of one therapeutic agent over another and its posology.