A premature ventricular contraction occurs when a focus in the ventricle generates an action potential before the next scheduled sinoatrial nodal action potential. Premature, occurring earlier ...

Electronic games have been shown to significantly increase the heart rate of participants. 2,3 Mental stress and heightened emotion have been shown to shorten the ventricular action potential and ...

However, recent findings suggest that other cell types of the heart, such as connective tissue cells ('fibroblasts') and macrophages, may additionally affect action potential propagation and, thus ...

Pittsburgh, PA - Scientists have developed new voltage-sensitive dyes that allow them to view and record cardiac action potentials from layers deep within the heart [1]. These new dyes will allow ...

5) On a much slower timescale, the minuscule concentrations of ions exchanged across the membrane are pumped back by membrane-bound Na + /K + exchangers (sometimes called ion pumps) that exchange K + ...

4 O'Hara T, Virág L, Varró A, Rudy Y., Simulation of the undiseased human cardiac ventricular action potential: model formulation and experimental validation, PLoS Comput Biol., 2011;7:e1002061 ?

Voltage-gated sodium (Na v) channels are responsible for mediating an "action potential" in muscle cells that leads to contraction.Na v 1.5 is the primary Na v channel expressed in the muscle ...

Mazhari, R., Hare, J. Mechanisms of action of mesenchymal stem cells in cardiac repair: potential influences on the cardiac stem cell niche. Nat Rev Cardiol 4 (Suppl 1), S21–S26 (2007). https ...

A premature ventricular contraction occurs when a focus in the ventricle generates an action potential before the next scheduled sinoatrial nodal action potential. Ventricular bigeminy occurs when ...