Results 261 to 270 of about 13,265,348 (295)

Lithium ions increase action potential duration of mammalian neurons

Brain Research, 1984
During Lucifer Yellow staining of mammalian neurons, intracellular recording revealed a prolongation of the action potential that is probably the result of leakage of lithium ions into the intracellular fluid. In experiments on dorsal root ganglion neurons intracellular iontophoresis of lithium ions also broadened the action potential.
M L, Mayer, V, Crunelli, J A, Kemp
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Stability of Cardiac Action Potential Duration under Periodic Pacing

2005 IEEE Engineering in Medicine and Biology 27th Annual Conference, 2005
Action potential duration (APD) alternans is believed to be a loss of stability and contributes much to the reentry arrhythmias. The purpose of this study is to analyze the stability conditions for one-dimension model and higher dimension model. These criterions are concluded by linear stability analysis in nonlinear dynamics. They should be useful for
Han, Xiaodong, Song, Hailang, Wu, Xiaomei, Yang, Cuiwei, Fang, Zuxiang   +4 more
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Determinants of action potential duration in neonatal rat ventricle cells

Cardiovascular Research, 1991
The aim was to study the currents that determine the action potential duration in ventricular cells from neonatal rats.Microelectrode measurements of action potentials from ventricle strips were compared with action potentials obtained from isolated myocytes with the whole cell patch clamp method in current clamp mode.
B, Fermini, O F, Schanne
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Somal action potential duration differs in identified primary afferents

Neuroscience Letters, 1986
In the present study we examined action potentials recorded from somata in the cat L7 and S1 dorsal root ganglia. We found (i) that there is a characteristic spike duration for each receptor type (e.g. Golgi tendon organ, D-hair) and (ii) that, for a given peripheral fiber conduction velocity, somata whose axons supply low-threshold cutaneous receptors
R D, Rose, H R, Koerber, M J, Sedivec, L M, Mendell   +3 more
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Electrotonic effects on action potential duration in perfused rat hearts

2009 Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2009
Electrotonic interactions in cardiac tissue have been shown previously to modulate dynamical properties of the myocardium such as action potential duration (APD) and action potential duration restitution. A recent computational study indicated that these electrotonic effects may be strongest in small murine hearts.
Richard D, Walton, Olivier, Bernus
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The effect of the duration of the action potential on contraction in the mammalian heart muscle

Pfl�gers Archiv f�r die Gesamte Physiologie des Menschen und der Tiere, 1968
A method is described to control the membrane potential in preparations of mammalian myocardium, and to measure tension simultaneously. The following observations are made:
M, Morad, W, Trautwein
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Heterogeneous memory in restitution of action potential duration in pig ventricles

Journal of Electrocardiology, 2010
Restitution of action potential duration and memory importantly affect electrical stability in ventricles. Studies have reported heterogeneous restitution among different regions of the ventricles. However, existence of heterogeneity in memory is not as well investigated.Transmembrane potentials were recorded in endocardial and epicardial tissues from ...
Linyuan, Jing, Sonam, Chourasia, Abhijit, Patwardhan   +2 more
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The dependence on heart rate of the human ventricular action potential duration

Cardiovascular Research, 1982
For the human electrocardiogram, the relationship between QT interval and heart rate was examined in conditions where the heart rate was changed at different rates. The QT interval provides a measure of the ventricular action potential duration. For slow changes of heart rate, elicited by mild exercise, the dependence of QT interval on heart rate ...
Arnold, L., Page, J., Attwell, D., Cannell, M., Eisner, D. A.   +4 more
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A simple electronic circuit for monitoring changes in the duration of the action potential

Pfl�gers Archiv European Journal of Physiology, 1983
A simple electronic circuit is described that produces a ramp voltage, the amplitude of which is proportional to the duration of the action potential. The circuit is ideal for monitoring changes in the duration of the action potential on slowly moving chart paper.
J C, Kentish, M R, Boyett
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Control of action potential duration alternans in canine ventricular tissue

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology, 2010
Cardiac action potential duration alternans is characterized by a beat-to-beat alternation in action potential waveform. Its presence has been putatively linked to the onset of lethal cardiac arrhythmias. Previous studies, which have been limited to cardiac Purkinje fibers, have shown that closed-loop alternans control techniques, which apply a ...
Uche, Kanu, Shahriar, Iravanian, Robert F, Gilmour, David J, Christini   +3 more
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