Abstract: A method for preventing or treating myocardial ischemia in a mammalian organism is disclosed. The compound 4-(1,4,5,6-tetrahydro-4-methyl-6-oxo-3-pyridazinyl)phenyl!hydrazono!prop anedinitrile or its enantiomer or a pharmaceutically acceptable salt there is administered to a mammalian organism in need of such prevention or treatment. The compound may be administered in its racemic form or in a form which is substantially free of the (+)-enantiomer or substantially free of the (-)-enantiomer.

Abstract: New heterocyclic compounds of formula I ##STR1## In which Het means one of following groups; ##STR2## wherein R.sub.11, R.sub.13 and R.sub.14 mean independently hydrogen, hydroxymethyl or lower alkyl group, Z means S, O or NH; A means valency bond, --CH.dbd.CH--, or --CH.sub.2 --CH.sub.2 --group; R.sub.1 and R.sub.2 independently mean nitro, cyano, halogen, amino, carboxamido, aryl, aroyl, pyridyl, alkoxycarbonyl, acyl or one of following groups; ##STR3## wherein R.sub.6 means hydrogen or lower alkyl group, R.sub.8 means lower alkyl, R.sub.7 means cyano or COOR.sub.10, wherein R.sub.10 means hydrgen or lower alkyl or R.sub.1 and R.sub.2 together form a susbtituted or unsubstituted 5 or 6 membered ring which may contain 1 to 2 heteroatom N; R.sub.3, R.sub.4, and R.sub.5 means independently hydrogen, hydroxy or lower alkyl group; Y means N or CH. The compounds may be used in the treatment of congestive heart failure.

Abstract: Substituted benzylideneiminophyenylpyridazinones or dihydropyridazinones of formula I ##STR1## in which R.sub.1 and R.sub.8 independently mean hydrogen or lower alkyl, R2 is hydrogen, lower alkyl, trifluoromethyl, hydroxy alkyl, halogen alkyl, alkoxy alkyl, pyridyl, furyl, thienyl or cycloalkyl or one of optionally substituted groups; aryl, aralkyl, aralkenyl or nitrogen containing heterocyclic ring joining through an alkyl or alkenyl group and R.sub.3, R.sub.4 and R.sub.5 independently mean hydrogen, lower alkyl, hydroxy alkyl, halogen, hydroxy, alkoxy, acyloxy, aroyloxy, formyl, acyl, cyano, amino, carboxy or trifluoromethyl, R.sub.6 and R.sub.7 independently mean hydrogen, amino, lower alkyl, hydroxy, nitro or cyano or R.sub.2 and R.sub.7 together form a --CH.sub.2 --NH-- or --CH.dbd.N-- group and A means phenyl, naphtyl or a nitrogen containing heterocyclic ring. The compounds may be used in the treatment of congestive heart failure.

Abstract: New heterocyclic compounds of formula I ##STR1## in which Het means one of following groups; ##STR2## wherein R.sub.11, R.sub.13 and R.sub.14 mean independently hydrogen, hydroxymethyl or lower alkyl group, Z means S, O or NH; A means valency bond, --CH.dbd.CH--, or --CH.sub.2 --CH.sub.2 -- group; R.sub.1 and R.sub.2 independently mean nitro, cyano, halogen, amino, carboxamido, aryl, aroyl, pyridyl, alkoxycarbonyl, acyl or one of following groups; ##STR3## wherein R.sub.6 means hydrogen or lower alkyl group, R.sub.8 means lower alkyl, R.sub.7 means cyano or COOR.sub.10, wherein R.sub.10 means hydrogen or lower alkyl or R.sub.1 and R.sub.2 together form a substituted or unsubstituted 5 or 6 membered ring which may contain 1 or 2 heteroatom N; R.sub.3, R.sub.4, and R.sub.5 mean independently hydrogen, hydroxy or lower alkyl group; Y means N or CH. The compounds may be used in the treatment of congestive heart failure.

Abstract: New heterocyclic compounds of formula I ##STR1## in which Het means one of following groups; ##STR2## wherein R.sub.11, R.sub.13 and R.sub.14 mean independently hydrogen, hydroxymethyl or lower alkyl group, Z means S, O or NH; A means valency bond, --CH.dbd.CH--, or --CH.sub.2 --CH.sub.2 --group; R.sub.1 and R.sub.2 independently means nitro, cyano, halogen, amino, carboxamido, aryl, aroyl, pyridyl, alkoxycarbonyl, acyl or one of following groups; ##STR3## wherein R.sub.6 means hydrogen or lower alkyl group, R.sub.8 means lower alkyl, R.sub.7 means cyano or COOR.sub.10, wherein R.sub.10 means hydrogen or lower alkyl or R.sub.1 and R.sub.2 together form a substituted or unsubstituted 5 or 6 membered ring which may contain 1 or 2 heteroatom N; R.sub.3, R.sub.4, and R.sub.5 mean independently hydrogen, hydroxy or lower alkyl group; Y means N or CH. The compounds may be used in the treatment of congestive heart failure.