title: [Study of electrophysiological effects of betaxolol].
abstract: Betaxolol is a new cardioselective beta-blocker without any intrinsic sympathomimetic activity. A study of the cardiac electrophysiological effects of this molecule used intravenously was carried out in 20 patients. Betaxolol prolongs the sinus cycle (+ 25%, p 0.001), prolongs the sino-atrial conduction time (+ 20.1%) and atrio-hissian conduction time (+ 10.8%, p 0.001), and prolongs the refractory periods at all levels: atrial (+ 8%), nodal (+ 20.8%), right ventricular (+ 4.3%). These findings confirm the electrophysiological characteristic effects of the beta-blockers series; however, the moderate but significant increase of the refractory ventricular period, seems to provide this molecule with a certain degree of originality in this therapeutic class.
mesh_terms: D000319:Adrenergic beta-Antagonists / Q000494:pharmacology*; D000368:Aged; D000369:Aged, 80 and over; D015784:Betaxolol; D004562:Electrocardiography; D005260:Female; D006321:Heart / Q000187:drug effects; D006329:Heart Conduction System / Q000187:drug effects*; D006801:Humans; D008297:Male; D008875:Middle Aged; D011412:Propanolamines / Q000494:pharmacology*
chemical_list: D000319:Adrenergic beta-Antagonists; D011412:Propanolamines; D015784:Betaxolol
vernacular_title: Etude des effets électrophysiologiques du bétaxolol.