Abstract

In 5-methyl-dihydropyridazinones, a stereoselectivity is observed only with respect to the phosphodiesterase III-inhibition. The (−)-enantiomers are very strong inhibitors whereas their (+)-counterparts exhibit only a weak activity. In the case of the thiadiazinone EMD 53998 a pronounced stereoselectivity regarding Ca-sensitivity and phosphodiesterase inhibition is apparent. It is concluded that Levosimendan exerts its positive inotropism almost exclusively through its potent phosphodiesterase III-inhibitory effect.

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