decremental conduction

conduction /con·duc·tion/ (-shun) conveyance of energy, as of heat, sound, or electricity.conduc´tive

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aberrant conduction  cardiac conduction through pathways not normally conducting cardiac impulses, particularly through ventricular tissue.

aerotympanal conduction  conduction of sound waves to the ear through the air and the tympanum.

air conduction  conduction of sound waves to the inner ear through the external auditory canal and middle ear.

anterograde conduction  transmission of a cardiac impulse in the normal direction, from the sinus node to the ventricles, particularly forward conduction through the atrioventricular node.

Diagrammatic view of the conducting system of the heart, showing anterograde conduction of the cardiac impulse.

bone conduction  conduction of sound waves to the inner ear through the bones of the skull.

concealed conduction  incomplete penetration of a propagating impulse through the cardiac conducting system such that electrocardiograms reveal no evidence of transmission but the behavior of one or more subsequent impulses is somehow affected.

concealed retrograde conduction  retrograde conduction blocked in the atrioventricular node; it does not produce an extra P wave but leaves the node refractory to the next normal sinus beat.

decremental conduction  delay or failure of propagation of an impulse in the atrioventricular node resulting from progressive decrease in the rate of the rise and amplitude of the action potential as it spreads through the node.

retrograde conduction  transmission of a cardiac impulse backward in the ventricular to atrial direction, particularly conduction from the atrioventricular node into the atria.

saltatory conduction  the passage of a potential from node to node of a nerve fiber, rather than along the membrane.

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decremental conduction

[dek′rəmen′təl]

transmission of an electric impulse in which the amplitude of the impulse decreases with distance.

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conduction [kon-duk´shun]

conveyance of energy, as of heat, sound, or electricity.

aberrant ventricular conduction the temporary abnormal intraventricular conduction of supraventricular impulses; called also ventricular aberration.

aerial conduction (air conduction) conduction of sound waves to the organ of hearing in the inner ear through the air.

anterograde conduction

1. forward conduction of impulses through a nerve.

2. in the heart, conduction of impulses from atria to ventricles.

atrioventricular conduction (AV conduction) the conduction of atrial impulses through the atrioventricular node and the His-Purkinje system to the ventricles.

bone conduction conduction of sound waves to the inner ear through the bones of the skull.

concealed conduction conduction that is not seen on the surface electrocardiogram but may be detected by its effect on subsequent impulses; common examples are the incomplete penetration of the AV junction during atrial fibrillation, the Wenckebach type penetration during atrial flutter, and the retrograde incomplete penetration following ventricular ectopic beats.

decremental conduction a gradual decrease in the stimuli and response along a pathway of conduction; it occurs in nerve fibers with reduced membrane potentials.

retrograde conduction transmission of a cardiac impulse backward in the ventricular to atrial direction; particularly, conduction from the atrioventricular node into the atria.

saltatory conduction the rapid passage of an electric potential between the nodes of ranvier in myelinated nerve fibers, rather than along the full length of the membrane.

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decremental conduction

a phenomenon which occurs in the cardiac AV node when, during complete AV block, continued stimulation causes a slowing and diminished amplitude of phase 0 in the AV nodal cells until a nonpropagated local response occurs.