K + contractures were induced in paired strips of rabbit aortic smooth muscle. The relationship between relaxant effects and the bath concentration of hydralazine acetone hydrazone (HA), 4-OH-hydralazine (HH) and phthalazine (P) was studied over the concentration range 10 -5 - 10 -3 M. All compounds were active, HA = HH > P (p < 0.05; n = 6) at concentrations in the range 10 -4 - 10 -3 M, HA > HH at a concentration of 10 -3M (p > 0.01). The activity of HA did not depend on significant reconversion to hydralazine (H) in the bath (< 0.5%). A range of H derivatives may contribute to the hypotensive effects of administered H.
|Number of pages||7|
|Journal||Archives Internationales de Pharmacodynamie et de Therapie|
|Publication status||Published - 1 Dec 1978|