Abstract: New benzimidazolylpyridazinones of the formula I ##STR1## in which R.sup.1 is a styryl or mononculear of binuclear heteroaryl radical which contains 1-4 heteroatoms, each of which is unsubstituted or singly or multiply substituted by alkyl, alkoxy, alkylthio, halogen, OH, SH, amino, alkylamino, dialkylamino, acylamino having 1-8 C atoms, nitro, COOH, COOalkyl and/or CN,R.sup.2 R.sup.3, R.sup.4 and R.sup.5 are each H or alkyl andR.sup.6 and R.sup.7 are each H, or together are a C--C bond, and in which the alkyl and alkoxy groups each contain 1-4 C atoms,and their salts, show positive inotropic, vasodilating and antithrombotic actions.

Abstract: New benzimidazolylpyridazinones of the formula I ##STR1## in which R.sup.1 is a styryl or mononuclear of binuclear heteroaryl radial which contains 1-4 heteroatoms, each of which is unsubstituted or singly or multiply substituted by alkyl, alkoxy, alkylthio, halogen, OH, SH, amino, alkylamino, dialkylamino, acylamino having 1-8 C atoms, nitro, COOH, COOalkyl and/or CN,R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each H or alkyl, andR.sup.6 and R.sup.7 are each H, or together are a C--C bond,and in which the alkyl and alkoxy groups each contain 1-4 C atoms,and their salts, show positive inotropic, vasodilating and antithrombotic actions.

Abstract: Thiadiazinones of the formula I ##STR1## wherein A is --CHR.sup.4 --CHR.sup.5 --, --CH.sub.2 --CR.sup.4 R.sup.5 --, --CR.sup.4 R.sup.5 --CH.sub.2 --, --CHR.sup.4 --CHR.sup.5 --CH.sub.2 --, --CHR.sup.4 --CH.sub.2 --CHR.sup.5 --, --CH.sub.2 --CHR.sup.4 --CHR.sup.5 --, --CR.sup.4 R.sup.5 --CH.sub.2 CH.sub.2 --, --CH.sub.2 --CR.sup.4 R.sup.5 --CH.sub.2 -- or --CH.sub.2 CH.sub.2 --CR.sup.4 R.sup.5 --,R.sup.1, R.sup.2, R.sup.3, R.sup.4 and R.sup.5 are each independently H, C.sub.1-5 -alkyl, C.sub.2-5 -alkenyl or C.sub.2-5 -alkinyl,R.sup.3 is also C.sub.1-15 -acyl,R.sup.6 is H, alkyl, alkoxyl, OH, F, Cl, Br or I andZ is (H, H), (H, alkyl), (alkyl, alkyl) or O,the alkyl, alkenyl, alkinyl and/or alkoxy groups in each case containing up to 5 C atoms, but wherein, if A is --CH.sub.2 CH.sub.2 -- and Z is O, one of the radicals R.sup.1, R.sup.2, R.sup.3 and R.sup.6 must be other than H,and salts thereof demonstrate positive inotropic action and are suitable for combating cardiovascular diseases.