Ventricular Escape Rhythm
Ventricular Escape Rhythm - Related Videos
08:03
Optogenetic Stimulation of Escape Behavior in Drosophila melanogaster
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Cited by 24 •
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Genetically encoded optogenetic tools enable noninvasive manipulation of specific neurons in the Drosophila brain. Such tools can identify neurons whose activation is sufficient to elicit or suppress particular behaviors. Here we present a method for activating Channelrhodopsin2 that is expressed in targeted neurons in freely walking flies.
01:26
Escape Velocity
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2025
The escape velocity of an object is defined as the minimum initial velocity that it requires to escape the surface of another object to which it is gravitationally bound and never to return. For example, what would be the minimum velocity at which a satellite should be launched from the Earth's surface such that it just escapes the Earth's gravitational field? To calculate the escape velocity, it is assumed that no energy is lost to any frictional forces. In practice, a satellite launched from...
03:20
Generation of Influenza Virus Escape Variants against Neutralizing Antibodies
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2025
This video demonstrates a technique for generating escape variants of neutralizing influenza virus monoclonal antibodies. Antibody-neutralized virus suspension is injected into embryonated chicken eggs to propagate escape variants selectively. This results in a virus population predominantly of escape variants, confirmed via a Hemagglutination assay.
12:09
Patient-specific Modeling of the Heart: Estimation of Ventricular Fiber Orientations
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Cited by 14 •
2013
A methodology to estimate ventricular fiber orientations from in vivo images of patient heart geometries for personalized modeling is described. Validation of the methodology performed using normal and failing canine hearts demonstrate that that there are no significant differences between estimated and acquired fiber orientations at a clinically observable level.
04:23
A Treatment Package without Escape Extinction to Address Food Selectivity
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Cited by 9 •
2015
Feeding difficulties are a common problem for children with developmental disorders, including autism, and behavioral interventions often include escape extinction. Recent research has begun to evaluate treatments that do not include escape extinction. This manuscript describes a multicomponent treatment package that does not use escape extinction to treat feeding difficulties.
FAQs
Its emergence reflects failure of impulses from the sinoatrial node or atrioventricular conduction system to activate the ventricles. Ventricular pacemaker cells can then generate spontaneous electrical activity, preventing complete loss of ventricular activation. This backup mechanism may preserve some cardiac output, but it also signals that the normal conduction pathway is not reliably driving the lower chambers.
The ECG typically shows a slow rate of about 20–40 beats per minute, wide QRS complexes, and possible atrioventricular dissociation. These findings indicate that ventricular activity is occurring independently of the usual atrial-to-ventricular conduction sequence. Interpreting the rate and relationship between atrial and ventricular activity helps clinicians recognize the rhythm and assess the seriousness of the conduction problem.
A rate near 20–40 beats per minute can provide only limited ventricular activity compared with normal cardiac pacing. Although the escape rhythm may temporarily maintain cardiac output, its slow rate makes the adequacy of circulation an important clinical concern. The finding therefore requires attention not only to rhythm identification, but also to the underlying conduction failure and the patient’s need for support.
Assessment should confirm the rhythm on an electrocardiogram and determine whether the pattern suggests severe conduction disease, including complete heart block. Clinicians should also evaluate the need for continued observation and urgent intervention because the rhythm may be sustaining ventricular activation only temporarily. This assessment connects the electrical finding with the patient’s immediate clinical risk.
Urgency increases when the rhythm reflects severe conduction disease, particularly complete heart block, or when ventricular activation is providing only temporary cardiac output. The response should include close monitoring while clinicians address the underlying problem. Because the escape rhythm may be a protective but inadequate backup, evaluation should not treat the ECG finding as an isolated benign variation.
Management includes monitoring the rhythm, treating reversible causes when identified, and using pacing when needed. These measures aim to maintain cardiac activation while the conduction problem is evaluated or corrected. The specific response depends on the clinical assessment, but recognition of the rhythm is important because it can indicate that the ventricles are functioning as an emergency backup pacemaker.