The present application relates to positive allosteric modulators of the muscarinic M2 receptor, in particular novel 7-substituted 1-aryl-naphthyridin-3-carboxylic acid amides, to processes for the preparation thereof, to the use thereof alone or in combinations for the treatment and/or prevention of diseases, and to the use thereof for the production of medicaments for the treatment and/or prevention of diseases, particular for the treatment and/or prevention of cardiovascular disorders and/or renal diseases.