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junctional rythm

J Siller Rodríguez, F de la Fuente Magallanes, J M Yañez Sánchez
We present the case of a 6 year old boy with permanent junctional reciprocating tachycardia. The tachycardia had been present since 3 years before ablation and was treated with two drugs without good control. He began to complain of palpitations and shortness of breath on exertion and the left ventricle ejection fraction was 55% by echocardiography. We performed an electrophysiologic study which showed the most early atrial activation at the coronary sinus with a long V-A interval. Orthodromic AV reciprocating tachycardia was confirmed as the mechanism of tachycardia by demonstrating atrial pre-excitation when a premature ventricular stimulus was delivered at the time the His bundle was refractory...
September 1996: Archivos del Instituto de Cardiología de México
K Bon, M Lantéri-Minet, J de Pommery, J F Michiels, D Menétrey
The evoked expression of the immediate-early gene-encoded proteins c-Fos and Krox-24 was used to study activation of mesodiencephalic structures as a function of the development of cyclophosphamide (CP) cystitis in behaving rats. This article is the third of a series and completes previously published data obtained at both spinal and hindbrain levels. CP-injected animals received a single dose of 100 mg/kg i.p. under transient volatile anesthesia and survived for 1-4 h in order to cover the entire postinjection period during which the disease develops...
February 1997: Experimental Brain Research. Experimentelle Hirnforschung. Expérimentation Cérébrale
J Kwoczyñski, E Gürtler-Krawczyńska, M Kedra-Luboińska, A Berger
The influence of retrograde conduction of the artificial pacemaker impulse from the right ventricle to the atria exerted upon the occurrence of rapid supraventricular rythms was investigated in patients with sick sinus syndrome. The bouts of tachycardia occurred in cases with fixed V-A retrograde block or coincided with temporary V-A block. The usually operating retrograde conduction from the pacemaker to the atria protects the patients from paroxysms of supraventricular tachycardia by means of the coordinated depolarization of the atria and junctional tissue...
1972: Cor et Vasa
G Pelletier
Immunoreactive NPY neurons are widely distributed in the hypothalamus of several mammalian species. In the rat, dense NPY fiber networks are found in the paraventricular, suprachiasmatic and arcuate nuclei. NPY-containing cell bodies are mostly found in the arcuate nucleus. Studies performed at the electron microscope level clearly indicate that NPY is concentrated in dense core vesicles in the cytoplasm of cell bodies as well as in terminals. Only a small percentage (about 20%) of the NPY endings are making synaptic contacts with nerve processes, especially dendrites...
1990: Annals of the New York Academy of Sciences
V Bonatti, A Finardi, E Lazzeroni, S Tagliavini, G Botti
Two cases of unusual A-V nodal rythms, very slow junctional bradycardia and junctional non paroxysmal tachycardia, are described. The Authors emphasize the study of the His bundle electrograms, the atrial electrograms and the time of the intrinsecoid deflection for correct diagnosis of these dysrrhythmias. From the results of the clinical and electrofisiological study and neurovegetative responses some conclusions about the mechanism and clinical significance of these arrhythmias are drawn.
1975: Giornale Italiano di Cardiologia
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