Antiarhythmic medicaments containing, as active substance, a compound of the formula: IMAGE (I) in which n is 1 or 2, X and Y are fixed in positions 5, 6, 7 or 8 on the quinoline cycle and each represents a hydrogen atom or an alkoxy group having 1 to 3 carbons, R is a hydrogen atom or an alkyl group having 1 to 4 carbons, cycloalkyl having 3 to 8 carbons, phenyl or phenyl substituted by alkoxy having 1 to 4 carbons, R1 is a hydrogen atom or an alkyl group having 1 to 4 carbons or a phenylalkyl group of which the alkyl part has 1 to 3 carbons, R2 is a hydrogen atom, an alkyl group having 1 to 2 carbons or an alkenyl group having 2 to 4 carbons.
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