Conduction of the cardiac impulse. II. Summation and inhibition.

HIS BUNDLE AND BUNDLE BRANCHES/Massing, James References

1. Clark J, Plonsey R: A mathematical evaluation of the core conductor model. Biophys J 6: 95, 1966 2. Weidmann S: The diffusion of radiopotassium across the intercalated disks of mammalian cardiac muscle. J Physiol 187: 323, 1966 3. Sperelakis N, Hoshiko T, Berne RM: Nonsyncytial nature of cardiac muscle: membrane resistance of single cells. Am J Physiol 198: 531, 1960 4. Plonsey R: Bioelectri...

Development and Function of the Cardiac Conduction System in Health and Disease

The generation and propagation of the cardiac impulse is the central function of the cardiac conduction system (CCS). Impulse initiation occurs in nodal tissues that have high levels of automaticity, but slow conduction properties. Rapid impulse propagation is a feature of the ventricular conduction system, which is essential for synchronized contraction of the ventricular chambers. When functi...

Reentry: slow conduction, summation and inhibition.

Conduction of the Cardiac Impulse

The excitability of short segments (5-7 mm) of bundles of canine Purkinje fibers was depressed by exposure to 15-18 mM K(+), to 15-18 mM K(+) plus 5 x 10(-6) epinephrine or norepinephrine, to low K(+), and to low Na(+). The depressed segment was in the center chamber of a three-chamber bath; the ends of the bundle were exposed to normal Tyrode solution. Each method of depression resulted in slo...

Neurological Study of Radial Nerve Conduction During Endoscopic Radial Artery Harvesting:An Intra‐Operative Evaluation

Endoscopic radial artery harvesting (ERAH) is a feasible and attractive minimally invasive approach for conduit procurement, however there have been concerns about a potential neurological damage occurring at the harvest limb site secondary to injury of the radial nerve during endoscopic harvesting. We present a case of ERAH in which we evaluated intraoperatively the characteristics of radial n...