title: [Effects on the systemic and coronary circulation of 2 nitrate derivatives, intravenous trinitrin and sublingual isosorbide dinitrate, administered during atrial pacing].
abstract: The changes in the systemic and coronary circulations produced by intravenous trinitrin 0.38 +/- 0.125 mg/hour and sublingual isosorbide dinitrate 5 mg were studied in 24 patients with coronary artery disease. When given during rapid atrial pacing both drugs decreased pulmonary capillary pressures (p less than 0.001), cardiac and coronary output (p less than 0.001 and p less than 0.01) and myocardial oxygen consumption (p less than 0.01). At these dosages, intravenous trinitrin has no significant effect on average systemic blood pressure or left ventricular work index; the coronary arterial resistances increased (p less than 0.005). Isosorbide dinitrate significantly decreased average systemic blood pressure and the left ventricular work index (p less than 0.001); there was no significant difference in the coronary arterial resistances; the decrease in coronary blood flow observed after sublingual isosorbide dinitrate seems partly due to a decreased perfusion pressure. The beneficial effect of these nitrite derivatives seems to be mainly related to a reduced preload.
mesh_terms: D000284:Administration, Oral; D000328:Adult; D000368:Aged; D001775:Blood Circulation / Q000187:drug effects*; D002304:Cardiac Pacing, Artificial; D003326:Coronary Circulation / Q000187:drug effects*; D003327:Coronary Disease / Q000188:drug therapy; D005260:Female; D006801:Humans; D007275:Injections, Intravenous; D007548:Isosorbide Dinitrate / Q000008:administration & dosage / Q000627:therapeutic use; D008297:Male; D008875:Middle Aged; D009060:Mouth Floor; D009206:Myocardium / Q000378:metabolism; D009573:Nitrites / Q000627:therapeutic use*; D005996:Nitroglycerin / Q000008:administration & dosage / Q000627:therapeutic use
chemical_list: D009573:Nitrites; D005996:Nitroglycerin; D007548:Isosorbide Dinitrate
vernacular_title: Effets sur les circulations systémique et coronaire de deux dérivés nitrés, trinitrine intraveineuse et dinitrate d'isosorbide sublingual, administrés au cours de la stimulation électrique auriculaire.