Spectrum analysis of transient phenomena of the left ventricular pressure.
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.
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
D011433:Propranolol; D007545:Isoproterenol; D009638:Norepinephrine