A descriptive study was performed for characterizingg malignant arterial hypertensión at Manuel Ascunce Domenech, during a que quinquenium. The study universe raised to 38 nursed whose data were processed in a PC using MICROSTAT program. Men represented 65, 7 % of the universe, the main age group was 48 to 67 years in which 50 % was located. Hyperuricemia, diabetes mellitus, hyperliproteinemia and ischemic cardiopathy were the most frequent personal antecendents; in 55, 3 % prevailed severe hypertension, mediating a period from 6 to 10 years (44, 7 %) for the diagnosis of malignant hypertension . The main lesions of target organs were renal failure, microproteinuria, atherotrombotic cerebral infarction, transientischemic stroke, letf ventricular hypertrophy and cardiac infartion.