Results 41 to 50 of about 22,194 (282)

Parametric analysis of the ionic concentrations effects in the behavior of the sinoatrial node

Revista Facultad de Ingeniería Universidad de Antioquia, 2013
A sensibility study on the effect of ionic concentrations in the behavior of the sinoatrial node was carried out. The study was based on the model proposed by H. Zhang, A. V. Holden and M.R. Boyett.
Daniel Alfonso Sierra, Oscar Leonel Rueda, Carlos Rodrigo Correa   +2 more
doaj   +1 more source

Impaired neuronal sodium channels cause intranodal conduction failure and reentrant arrhythmias in human sinoatrial node

Nature Communications, 2020
The role of of voltage-gated sodium channels (Nav) in pacemaking and conduction of the human sinoatrial node is unclear. Here, the authors investigate existence and function of neuronal and cardiac Nav in human sinoatrial nodes, and demonstrate their ...
Ning Li, Anuradha Kalyanasundaram, Brian J. Hansen, Esthela J. Artiga, Roshan Sharma, Suhaib H. Abudulwahed, Katelynn M. Helfrich, Galina Rozenberg, Pei-Jung Wu, Stanislav Zakharkin, Sandor Gyorke, Paul ML. Janssen, Bryan A. Whitson, Nahush A. Mokadam, Brandon J. Biesiadecki, Federica Accornero, John D. Hummel, Peter J. Mohler, Halina Dobrzynski, Jichao Zhao, Vadim V. Fedorov   +20 more
doaj   +1 more source

Histopathological changes in the electrical conduction of cardiac nodes after acute myocardial infarction in dogs and horses, compared with findings in humans: A histological, morphometrical, and immunohistochemical study [PDF]

Veterinary World, 2023
Background and Aim: The heart conduction system is responsible for the occurrence of various types of cardiac arrhythmia. This study aimed to histologically and morphometrically describe damaged cardiac nodes during acute myocardial infarction and to ...
Fabián Gómez-Torres, Luis Ballesteros-Acuña, Amparo Ruíz-Sauri   +2 more
doaj   +1 more source

The sinoatrial node, a heterogeneous pacemaker structure [PDF]

Cardiovascular Research, 2000
This article focuses on the regional heterogeneity of the mammalian sinoatrial (SA) node in terms of cell morphology, pacemaker activity, action potential configuration and conduction, densities of ionic currents (i(Na), i(Ca,L), i(to), i(K,r), i(K,s) and i(f)), expression of gap junction proteins (Cx40, Cx43 and Cx45), autonomic regulation, and ageing.
M R, Boyett, H, Honjo, I, Kodama
openaire   +2 more sources

The role of inhibitory G proteins and regulators of G protein signaling in the in vivo control of heart rate and predisposition to cardiac arrhythmias [PDF]

, 2012
Inhibitory heterotrimeric G proteins and the control of heart rate. The activation of cell signaling pathways involving inhibitory heterotrimeric G proteins acts to slow the heart rate via modulation of ion channels.
Ang, R, Opel, A, Tinker, A
core   +1 more source

Aging and Sinoatrial Node Dysfunction [PDF]

Circulation, 2007
In the century since the discovery by Keith and Flack of the sinoatrial node in the mole heart, a detailed mosaic of its cellular, anatomic, and electrophysiological properties has emerged. The human sinus node has been found to be anatomically constant and well localized, occupying an approximately 10-mm subepicardial region on the sulcus terminalis ...
Haris M. Haqqani, Jonathan M. Kalman
openaire   +1 more source

Do human sinoatrial node cells have t-tubules?

Translational Research in Anatomy, 2021
Every heartbeat is generated by spontaneously depolarizing specialised nodal cells that make up the sinoatrial node (SN). The SN's unique properties depend on two complex mechanisms - the membrane-voltage and the Ca2+ clocks, regulated by strictly ...
Maria A. Petkova, Halina Dobrzynski
doaj   +1 more source

Effects of Cardiac Structural Remodelling During Heart Failure on Cardiac Excitation – Insights from a Heterogeneous 3D Model of the Rabbit Atria [PDF]

, 2015
Heart failure is a leading cause of morbidity and mortality in the western world. One of the effects of heart failure is the structural remodelling of cardiac tissue, including tissue dilation and development of fibrosis.
Boyett, Mark, Castro, Simon J, Colman, Michael A, Hart, George, Jarvis, Jonathan C, Kottas, Petros, Stephenson, Robert S, Zhang, Henggui   +7 more
core   +2 more sources

SHOX2 refines the identification of human sinoatrial nodal cell population in the in vitro cardiac differentiation

Regenerative Therapy, 2022
Introduction: Dysfunction of the sinoatrial node (SAN) cells causes arrhythmias, and many patients require artificial cardiac pacemaker implantation. However, the mechanism of impaired SAN automaticity remains unknown, and the generation of human SAN ...
Takayuki Wakimizu, Kumi Morikawa, Kenta Fukumura, Tetsuo Yuki, Takashi Adachi, Yasutaka Kurata, Junichiro Miake, Ichiro Hisatome, Motokazu Tsuneto, Yasuaki Shirayoshi   +9 more
doaj   +1 more source

Gap junctions in the rabbit sinoatrial node [PDF]

American Journal of Physiology-Heart and Circulatory Physiology, 2001
In comparison to the cellular basis of pacemaking, the electrical interactions mediating synchronization and conduction in the sinoatrial node are poorly understood. Therefore, we have taken a combined immunohistochemical and electrophysiological approach to characterize gap junctions in the nodal area.
S, Verheule, M J, van Kempen, S, Postma, M B, Rook, H J, Jongsma   +4 more
openaire   +2 more sources