A class of N-arylheteroarylalkyl imidazol-2-one compounds is described for use in treatment of arteriosclerosis. Compounds of particular interest are angiotensin II antagonists of Formula I: wherein Ar is selected from wherein m is one; wherein R1 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, 4-methylbutyl, 2-ethylbutyl, n-pentyl, neopentyl, phenyl, methylphenyl, difluorophenyl, benzyl, phenethyl, cyclohexyl, cyclohexylmethyl, cyclohexylethyl, cyclohexanoyl, 1-oxo-2-cyclohexylethyl, benzoyl, 1-oxo-2-phenethyl, 1-oxopropyl, 1-oxobutyl, 1-oxopentyl and 2-hydroxybutyl; wherein R0 is hydrido; wherein R2 is selected from methyl, ethyl, n-propyl, isopropyl, n-butyl, sec-butyl, isobutyl, tert-butyl, n-pentyl, isopentyl, neopentyl, phenyl, benzyl, phenethyl, cyclohexyl, cyclohexylmethyl, propylthio, butylthio, and hydroxyalkyl; wherein each of R3, R4, R6, R7, R8, R9, R10 and R11 is hydrido and R5 may be selected from COOH and tetrazolyl; or a tautomer thereof or a pharmaceutically-acceptable salt thereof.