Abstract: The present invention relates to a compound having a structure as shown in formula (I) or a pharmaceutically acceptable salt or prodrug thereof, wherein R1 is ethyl, —H, or methyl and R2 is a side chain having a structure as shown in formula (II) wherein X1 is C?O, CH2, C?S, C—OH, C—NH2, or C—NO2, X2 to X4 are independently selected from CH2, C?O, C?S, C—OH, and C—NH2, or R2 is —NH2, for use in treating and/or preventing of atrial arrhythmia in a subject. The present invention further relates to pharmaceutical compositions and kit related to said compound.

Abstract: The present invention relates to an antagonist of the Two-Pore Domain Potassium Channel (TASK-1) K2P3.1 for use in the prevention and/or treatment of cardiac arrhythmia in a subject. The invention also relates to a nucleic acid molecule usable in the prevention and/or treatment of cardiac arrhythmia in a subject. The invention further relates to a cell comprising said nucleic acid molecule. The invention further relates to a vector comprising said nucleic acid molecule.

Abstract: The present invention relates to an in vitro method for evaluating the anti- or pro-arrhythmic potential, cardiotoxicity and/or modulation capacity of cardiomyocyte function of compound(s). The present invention also relates to compound(s) identified or evaluated in the method of the invention for use in the treatment of a heart disease. The present invention further relates to the use of the density change of cardiac Nav 1.5 sodium channels in intercalated discs of cardiomyocytes as marker and/or diagnostic for the anti- or pro-arrhythmic potential of a compound, the cardiotoxicity of a compound or modulation capacity of cardiomyocyte function by said compound, and/or in preclinical assessment for cardiac liability of compounds and cardio-safety assessment. The present invention further relates to a kit for evaluating the anti- or pro-arrhythmic potential, cardiotoxicity and/or modulation capacity of cardiomyocyte function of compound(s).

Abstract: The present invention relates to an in vitro method for evaluating the anti- or pro-arrhythmic potential, cardiotoxicity and/or modulation capacity of cardiomyocyte function of compound(s). The present invention also relates to compound(s) identified or evaluated in the method of the invention for use in the treatment of a heart disease. The present invention further relates to the use of the density change of cardiac Nav 1.5 sodium channels in intercalated discs of cardiomyocytes as marker and/or diagnostic for the anti- or pro-arrhythmic potential of a compound, the cardiotoxicity of a compound or modulation capacity of cardiomyocyte function by said compound, and/or in preclinical assessment for cardiac liability of compounds and cardio-safety assessment. The present invention further relates to a kit for evaluating the anti- or pro-arrhythmic potential, cardiotoxicity and/or modulation capacity of cardiomyocyte function of compound(s).