Concealed conduction

Regarding cardiology and conduction characteristics-

Tissue stimulation without direct effect (such as causing contraction in another chamber), but leading to a change in conduction characteristics.

A common example would be an interpolated PVC (a type of premature ventricular contraction) during normal sinus rhythm; the PVC does not cause an atrial contraction, because the retrograde impulse from the PVC does not completely penetrate the AV node. However, this AV node stimulation (which is not visible on EKG by itself, hence "concealed") can cause a delay in subsequent AV conduction by modifying the AV node's subsequent conduction characteristics. Hence, the P-R interval after the PVC is longer than the baseline P-R interval.

Another variation on this concept is seen in atrial flutter. As a result of the rapid atrial rate, some of the atrial activity fails to get through the AV node in an antegrade direction but can alter the rate at which a subsequent atrial impulse is conducted. In this circumstance, an alteration in the F-wave to QRS relationship is seen.

See also

• Atrioventricular node
• Electrocardiogram

This medical sign article is a stub. You can help Wikipedia by expanding it.v · Categories: Cardiac electrophysiology Medical sign stubs Medical signs Wikimedia Foundation. 2010. Игры ⚽ Поможем сделать НИР Johnny Leahy Jayne Grayson Look at other dictionaries: 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 …   Medical dictionary conduction — 1. The act of transmitting or conveying certain forms of energy, such as heat, sound, or electricity, from one point to another, without evident movement in the conducting body. 2. The transmission of stimuli of various sorts by living protoplasm …   Medical dictionary 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, manifest as lengthening of the PR interval of that beat …   Medical dictionary Supraventricular tachycardia — Classification and external resources Lead II electrocardiogram strip showing SVT with a heart rate of about 150. ICD 10 I …   Wikipedia Metamaterial cloaking — Electromagnetism Electricity · …   Wikipedia Hearing aid — Behind the ear aid In the ear aid …   Wikipedia glacier — glaciered, adj. /glay sheuhr/, n. an extended mass of ice formed from snow falling and accumulating over the years and moving very slowly, either descending from high mountains, as in valley glaciers, or moving outward from centers of… …   Universalium mechanism — 1. An arrangement or grouping of the parts of anything that has a definite action. 2. The means by which an effect is obtained. 3. The chain of events in a particular process. 4. The detailed description of a reaction pathway. [G. mechane, a… …   Medical dictionary Visual display unit — A visual display unit, often called simply a monitor or display, is a piece of electrical equipment which displays images generated from the video output of devices such as computers, without producing a permanent record. A newer monitor… …   Wikipedia Rotisserie — Chicken cooking on a horizontal rotisserie For the fantasy sports game, see Rotisserie sports. Rotisserie is a style of roasting where meat is skewered on a spit a long solid rod used to hold food while it is being cooked over a fire in a… …   Wikipedia 18+ © Academic, 2000-2024 Contact us: Technical Support, Advertising Dictionaries export, created on PHP, Joomla, Drupal, WordPress, MODx. Mark and share Search through all dictionaries Translate… Search Internet Share the article and excerpts Direct link … Do a right-click on the link above and select “Copy Link”