[Retardation of the excitation conduction by propaphenone. Duration and dosage effect relation after oral administration (author's transl)]

After oral administration, and depending on dosage, propaphenone produces a uniform delay of the excitation conduction in the region of the atrium, ventricle and atrioventricular conduction. At a dosage of 5 or 10 mg/kg body-weight (1 or 2x 300 mg capsules) propaphenone causes an average delay of excitation conduction of + 11% or + 19% of the initial value, and of + 39% (capsule) or + 30% (sugar coated tablet) at 14 mg/kg body-weight. The maximum effect is attained 2.5 to 4 hours after administration. A prolongation of conduction times and consequently of the anti-arrhythmic efficacy, is still found eight hours after oral ingestion.

[Comparison of the haemodynamic effects in man of the beta-adrenergic blocking substances Kö 1366 and practolol (author's transl)]

In 21 healthy male persons haemodynamic changes (heart rate, end-diastolic pulmonary artery pressure, training condition of heart, a so-called index of heart sufficiency and arterial blood pressure) at rest and during dynamic exercise were compared respectively before and after i.v. injection of 0.0375 mg/kg of the beta-adrenergic blocking drug K+5Ao 1366 [O-(2-hydroxy-3-(tert. butylamino)-propoxy)-benzonitril-hydrochloride], of 0.3 mg/kg practolol [4-(2-hydroxy-3-isopropylaminopropoxy)-acetanilide] and a placebo. According to the analysed parameters Kö 1366 has an essentially better beta-adrenergic blocking potency than practolol. Neither of the two substances has a negative inotropic effect or influences the arterial blood pressure.