Results 191 to 200 of about 20,476 (227)
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The pacemaker cell of the sinoatrial node of the rabbit
American Journal of Physiology-Heart and Circulatory Physiology, 1978Rabbit sinoatrial nodes were isolated and studied in an attempt to determine the cell of origin of the true pacemaker potential. Cells of the sinoatrial node of the rabbit giving rise to the characteristic true pacemaker potential were iontophoretically tagged with lanthanum.
J J, Taylor, L S, D'Agrosa, E M, Burns
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Histamine and pacemaker shift in the sinoatrial node
Agents and Actions, 1994We used the isolated superfused preparations of right atrium with the zone of the sinoatrial node of rabbits to study the effects of histamine on the location of the dominant pacemaker. The preparations were cut into four pieces and electrical activity was recorded in each fragment by means of a surface suction electrode with internal KCl perfusion ...
E, Kevelaitis +2 more
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1976
The impulse for the activation of the heart is generated normally in the sinoatrial node (SA node). This structure covers an area of only a few square millimeters. The cells have an irregular contour and are small (diameter less than 10 μ). Furthermore, they contain sparse myofilaments which are often not well organized. The intercellular junctions are
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The impulse for the activation of the heart is generated normally in the sinoatrial node (SA node). This structure covers an area of only a few square millimeters. The cells have an irregular contour and are small (diameter less than 10 μ). Furthermore, they contain sparse myofilaments which are often not well organized. The intercellular junctions are
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If and sinoatrial node pacemaking
2004The majority of Na+ channels in the heart are composed of the tetrodotoxin (TTX)-resistant (KD, 2-6 μM) Nav1.5 isoform; however, recently it has been shown that TTX-sensitive (KD, 1-10 nM) neuronal Na+ channel isoforms (Nav1.1, Nav1.3 and Nav1.6) are also present and functionally important in the myocytes of the ventricles and the sinoatrial (SA) node.
A. Bucchi, M. Baruscotti, D. DiFrancesco
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Disturbances of Sinoatrial Node Function
2000The spectrum of human cardiac performance is amazingly broad with cardiac output varying 10–20-fold between that measured during the deepest of sleep to that seen at peak of exercise. In large part this tremendous cardiac reserve is modulated both by cardiac contractility as well as the heart rate itself.
Ruey J. Sung, Michael R. Lauer
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[The effect of aminophylline on the sinoatrial node].
Casopis lekaru ceskych, 1994The objective of the submitted prospective study was to assess the influence of intravenously administered aminophylline on the sinoatrial node. The authors examined by electrophysiological methods 20 patients (16 without dysfunction of the sinoatrial node and 4 with dysfunction of the sinoatrial node).
J, Pella +4 more
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The Sinoatrial Node and Its Dysfunction
1987The purpose of this chapter is to review the function and dysfunction of the sinoatrial node (SAN). The majority of the chapter encompasses SAN dysfunction: surface electrocardiography; clinical manifestations; noninvasive evaluation; intracardiac electrophysiology and treatment.
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Mechanisms of Sinoatrial Node Dysfunction in Heart Failure With Preserved Ejection Fraction
Circulation, 2022Thássio Ricardo Ribeiro Mesquita +2 more
exaly