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Cardiovascular Effects of R- and S‐Enantiomers of Ro 22–9194, (2/?)-2‐Amino-AM2,6‐imethylphenyl)- AT-[3-(3‐Pyridyl)Propyl]Propionamide D‐Tartrate and (2S)-2‐Amino-AK2,6‐Dimethylphenyl)-N-[3-(3‐Pyridyl)Propyl]Propionamide L‐Tartrate, in Dog Heart Preparations

Summary: A newly synthesized compound, Ro 22–9194, relates in part to the chemical structure of lidocaine. The cardiac effects of R- and 5-enantiomers of Ro 22–9194 were investigated on isolated right atrial and left ventricular (LV) preparations which were cross-perfused with blood from another donor dog and an anesthetized open-chest dog. Each enantiomer (1–1,000 μ,g) decreased dose-dependently the sinus rate and atrial developed tension in the isolated right atrium (RA). The negative chronotropic responses to R- and S-enantiomers were not significantly different, and the negative inotropic responses to R- and S-enantiomers were also generally comparable. Both R- and S-enantiomers (10–3,000 μ,g) also decreased the ventricular developed tension in a dose-related manner similarly. In neurally decentralized, anesthetized, open-chest dogs, R- and S-enantiomers (0.1–3 mg/kg) injected into the femoral vein dose-dependently prolonged atrioventricular (A-V) conduction time and decreased heart rate (HR) and arterial blood pressure (ABP). Each enantiomer (3 mg/kg intravenously, i.v.) prolonged the interval between His bundle and ventricle rather than the interval between atrium and His bundle. There was no significant difference between R- and S-enantiomer-induced negative dromotropic actions. The duration of the negative dromotropic response to each enantiomer (3 mg/kg i.v.) was longer than that of the decrease in BP. These results suggest that the negative chronotropic, inotropic, and dromotropic effects of R- and S-enantiomers of Ro 22–9194 are not stereospecific in dog heart.