نتایج جستجو برای: atrioventricular node dysfunction

تعداد نتایج: 334528  

Journal: :Circulation. Arrhythmia and electrophysiology 2009
Ian D Greener James O Tellez Halina Dobrzynski Mitsuru Yamamoto Gillian M Graham Rudi Billeter Mark R Boyett

BACKGROUND Little is known about the distribution of gap junctions and ion channels in the atrioventricular node, even though the physiology and pathology of the atrioventricular node is ultimately dependent on them. METHODS AND RESULTS The abundance of 30 transcripts for markers, gap junctions, ion channels, and Ca(2+)-handling proteins in different regions of the rabbit atrioventricular nod...

Journal: :Journal of cell science 1993
R G Gourdie N J Severs C R Green S Rothery P Germroth R P Thompson

Electrical coupling between heart muscle cells is mediated by specialised regions of sarcolemmal interaction termed gap junctions. In previous work, we have demonstrated that connexin42, a recently identified gap-junctional protein, is present in the specialised conduction tissues of the avian heart. In the present study, the spatial distribution of the mammalian homologue of this protein, conn...

Journal: :Circulation journal : official journal of the Japanese Circulation Society 2008
Naokata Sumitomo Kensuke Karasawa Kazuo Taniguchi Rie Ichikawa Junji Fukuhara Osamu Abe Michio Miyashita Hiroshi Kanamaru Mamoru Ayusawa Kensuke Harada

BACKGROUND This study was performed to investigate the incidence of arrhythmias in patients with Kawasaki disease (KD). METHODS AND RESULTS Electrophysiologic studies (EPS) were performed in 40 patients (mean age: 10.3+/-5.1 years; 30 males, 10 females) with KD who had severe to moderate coronary artery disease. Clinical arrhythmias were documented in 4 patients (premature ventricular contrac...

Journal: :Journal of the American College of Cardiology 1996
C T Tai S A Chen C E Chiang S H Lee C W Chiou K C Ueng Z C Wen Y J Chen M S Chang

OBJECTIVES This study sought to investigate electrophysiologic characteristics and possible anatomic sites of multiple anterograde slow atrioventricular (AV) node pathways and to compare these findings with those in dual anterograde AV node pathways. BACKGROUND Although multiple anterograde AV node pathways have been demonstrated by the presence of multiple discontinuities in the AV node cond...

Journal: :Circulation research 1959
T SANO M TASAKI T SHIMAMOTO

In the region of the atrioventricular node a characteristic cell potential was obtained by microelectrode recording in dogs. The resting and action potentials obtained here were small and the latter had a step-like potential before the steepest rise. The site of: origin was examined histologically by a special staining technic and was found to be from a cell of the atrioventricular node or a pa...

Journal: :physiology and pharmacology 0
khoori vahid nayebpour mohsen dept. pharmacology, school of pharmacy, tehran university of medical sciences, tehran, iran naseri mohsen hoseinkhalehjir seyedgholamreza salehi aref

introduction: ouabaine is a well-known atrioventricular (av) node depressant agent, but its effects on functional properties of the av node have not been cleared. the aim of the present study was to determine how ouabaine administration modifies the rate-dependent properties of the av node. methods: selective stimulation protocols were used to quantify independently electrophysiological propert...

Journal: :British heart journal 1974
A Castellanos R J Sung D Cunha R J Myerburg

Electrograms from the bundle of His were recorded in two patients with acute myocardial infarction during paroxysmal atrioventricular block induced by carotid sinus massage. From the viewpoint of the surface electrocardiogram this arrhythmia was considered as a form of Type II (Mobitz) Ulo:k, the onset of which was related to a decrease in atrial rate. In the first patient, the conduction distu...

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