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1. KRN2391 (3-30 micrograms/kg, i.v.) produced a decrease in mean blood pressure (MBP) with concomitant increase in heart rate (HR) and change in electrocardiogram (ECG) such as the shortening of PP and PQ intervals and the prolongation of QTc and these changes in HR and ECG were attenuated by pretreatment with propranolol (1 mg/kg) in normal dogs. 2. KRN2391 at 30 micrograms/kg induces neither suppression nor aggravation of ventricular arrhythmias caused by adrenaline and digitalis. 3. In two-stage coronary ligation-induced arrhythmia, KRN2391 inhibited arrhythmia at 48 hr. 4. These results suggest that KRN2391 may be effective on arrhythmia related to ischemia. In addition, it is considered that arrhythmia is not induced even by a high dose of KRN2391 in the normal condition.
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