title: Spectrum analysis of transient phenomena of the left ventricular pressure.
abstract: The application of "real time" spectrum analysis to left ventricular pressure during transient phenomena is described. Transient phenomena generated by the injection of drugs (norepinephrine-isoproterenol), anoxia and occlusion of aorta and carotids show sudden changes in the frequency of heart contraction. Propranolol stabilizes the heart rate in similar circumstances.
mesh_terms: D000818:Animals; D001011:Aorta / Q000502:physiology; D002339:Carotid Arteries / Q000502:physiology; D004285:Dogs; D006339:Heart Rate / Q000187:drug effects; D006352:Heart Ventricles / Q000503:physiopathology; D000860:Hypoxia / Q000503:physiopathology; D007545:Isoproterenol / Q000494:pharmacology*; D009200:Myocardial Contraction / Q000187:drug effects*; D009638:Norepinephrine / Q000494:pharmacology*; D011433:Propranolol / Q000494:pharmacology*; D016276:Ventricular Function
chemical_list: D011433:Propranolol; D007545:Isoproterenol; D009638:Norepinephrine