HEART PERIOD AND VAGAL EFFECTS ON AV CONDUCTION/Morti/i
نویسنده
چکیده
duced by brainstem lesions in the rat. Circ Res 32: 584-593, 1973 10. Badr GG, Lindholm LE: A simple method for connecting chronically implanted electrodes. Physiol Behav 9: 487-488, 1972 11. Snedecor GW: Statistical Methods Applied to Experiments in Agriculture and Biology. Ames, Iowa State University Press, 1967 12. Guazzi M, Zanchetti A: Blood pressure and heart rate during natural sleep of the cat and their regulation by carotid sinus and aortic reflexes. Arch Ital Biol 103: 789-817, 1965 13. Ito CS, Scher AM: Arterial baroreceptor fibers from the aortic region of the dog in the cervical vagus nerve. Circ Res 32: 442-446, 1973 14. Ito CS, Scher AM: Reflexes from the aortic baroreceptor fibers in the cervical vagus of the cat and the dog. Circ Res 34: 51-60, 1974
منابع مشابه
Paradoxical dynamic interaction of heart period and vagal activity on atrioventricular conduction in the dog.
The dynamic interaction of simultaneously changing heart period and single vagal stimuli on atrioventricular conduction (AV interval) was quantified by subtracting the vagally induced responses of the paced heart preparation from those of the unpaced heart preparation. This difference was significantly greater (P less than 0.05) than the AV responses to changes in heart period (delta A) alone w...
متن کاملDynamic counterbalance between direct and indirect vagal controls of atrioventricular conduction in cats.
The vagal system regulates the atrioventricular conduction time ( T AV) via two opposing mechanisms: a direct effect on the atrioventricular node and an indirect effect through changes in heart period ( T AA). To evaluate how dynamic vagal activation affects T AV, we stimulated the vagal nerve with frequency-modulated Gaussian white noise and estimated the transfer function from vagal stimulati...
متن کاملEffects of continuous enhanced vagal tone on dual atrioventricular node and accessory pathways.
BACKGROUND The aim of this study was to test the electrophysiological effects of continuous enhanced vagal tone on dual atrioventricular (AV) nodal and accessory pathways. METHODS AND RESULTS This study included 10 patients with typical, slow-fast AV nodal reentrant tachycardia (AVNRT) and 10 patients with AV reciprocating tachycardia. Electrophysiological data were measured before and during...
متن کاملAlternating Ventricular Preexcitation
A 45-year-old woman diagnosed with Wolff-Parkinson-White syndrome preferred treatment with propafenone rather than catheter ablation. A 12-lead electrocardiogram (Fig. 1) after the drug administration showed sinus arrhythmia; alternating ventricular preexcitation; and alternating T wave inversion in the inferior leads during normal AV conduction. Ventricular preexcitation may disappear because ...
متن کاملClinical and electrophysiologic findings in patients with paroxysmal slowing of the sinus rate and apparent Mobitz type II atrioventricular block.
Over five years, 13 patients with episodic apparent type II atrioventricular (AV) block associated with sinus slowing were seen. This phenomenon occurred only transiently during an acute illness in eight patients (group I) but recurred chronically in five (groupII). For the group as a whole, the mean spontaneous cycle length was 42% longer during the period of AV block compared with periods of ...
متن کامل