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Topic: AV node


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EKG

In the News (Mon 22 Apr 19)

  
  AnatomyAVNode
The electric impulse from the SA must be conducted though the AV node because the atria and ventricles are separated by a fibrous connective tissue septum that has poor conductivity.
AV node because the atria and ventricles are separated by a fibrous connective tissue ring that has poor conductivity.
Since the AV node has a long refractory period, some of these impulses find the AV node refractory and are not conducted to the ventricles.
www.technion.ac.il /~eilamp/AnatomyAVnode.html   (285 words)

  
  Atrioventricular node - Biocrawler   (Site not responding. Last check: )
The atrioventricular node (abbreviated AV node) is the tissue between the atria and the ventricles of the heart, which conducts the normal electrical impulse from the atria to the ventricles.
This is the property of the AV node that prevents rapid conduction to the ventricle in cases of rapid atrial rhythms, such as atrial fibrillation or atrial flutter.
The blood supply of the AV node is from a branch of the right coronary artery in 85 to 90 percent of individuals, and from a branch of the left circumflex artery in 10 to 15 percent of individuals.
www.biocrawler.com /encyclopedia/AV_node   (242 words)

  
 [No title]
For example, a marked reduction in the rate of impulse formation in the sinus node would lead to the arrhythmia known as sinus bradycardia, and the failure of the wave of excitation to transverse the AV node would lead to AV block.
If the AV node or common His bundle has been completely destroyed, for example by an infarction, complete AV block will result, and the only treatment for this condition is the implantation of an artificial pacemaker.
The catecholamines increase the slope of slow diastolic depolarization in the sinus node, and it is thought that this occurs by means of an increase in the inward calcium current during phase 4.
www.oswego.edu /oz/pharmlec.html   (0 words)

  
 AnatomyAVNode
The electric impulse from the SA must be conducted though the AV node because the atria and ventricles are separated by a fibrous connective tissue septum that has poor conductivity.
AV node because the atria and ventricles are separated by a fibrous connective tissue ring that has poor conductivity.
Since the AV node has a long refractory period, some of these impulses find the AV node refractory and are not conducted to the ventricles.
sprojects.mmi.mcgill.ca /cardiophysio/AnatomyAVnode.htm   (285 words)

  
 CIGNA - Catheter ablation for atrial fibrillation
After AV node ablation, a permanent pacemaker is needed to regulate your heart rhythm.
AV node, or nodal, catheter ablation is occasionally used when persistent chronic atrial fibrillation does not respond to treatment with medicines and symptoms continue to be bothersome.
AV node ablation followed by pacemaker implantation reduces cardiac symptoms and improves exercise tolerance, quality of life, and the amount of blood pumped with each heartbeat (ejection fraction).
www.cigna.com /healthinfo/hw159948.html   (1007 words)

  
 AV node definition - Medical Dictionary definitions of popular medical terms easily defined on MedTerms
AV node: An electrical relay station between the atria (the upper) and the ventricles (the lower chambers of the heart).
The electrical signal generated by the SA node moves from cell to cell down through the heart until it reaches the AV node, a cluster of cells situated in the center of the heart between the atria and ventricles.
The AV node serves as a gate (an "electrical relay station") that slows the electrical current before the signal is permitted to pass down through to the ventricles.
www.medterms.com /script/main/art.asp?articlekey=2407   (520 words)

  
 eMedicine - First-Degree Atrioventricular Block : Article Excerpt by: Jamshid Alaeddini, MD
The AV node is located beneath the right atrial endocardium, dorsal to the septal leaflet of the tricuspid valve, and about 1 cm superior to the orifice of the coronary sinus.
The bundle of His originates from the anteroinferior pole of the AV node and travels through the central fibrous body to reach the dorsal edge of the membranous septum.
Blood supply to the AV node is provided by the AV node artery, a branch of the right coronary artery in 90% of individuals and of the left circumflex coronary artery in the remaining 10%.
www.emedicine.com /med/byname/first-degree-atrioventricular-block.htm   (562 words)

  
 AV Junctional Rhythm Disturbances
Tachyarrhythmias arising from the AV junction are common.
Depending on retrograde conduction across the AV node, the atrial may be dissociated or a 1:1 or 2:1 retrograde response may be noted.
It occurs because of failure of the sinus node to initiate an appropriately timid impulse or because of a conduction problem between the sinus node and the AV junction.
www.americanheart.org /presenter.jhtml?identifier=746   (1096 words)

  
 Normal impulse conduction
The AV node is a highly specialized conducting tissue (cardiac, not neural in origin) that slows the impulse conduction considerably (to about 0.05 m/sec) thereby allowing sufficient time for complete atrial depolarization and contraction (systole) prior to ventricular depolarization and contraction.
Drugs such as digitalis, which increase vagal activity to the heart, are used to reduce AV nodal conduction in patients that have atrial flutter or fibrillation.
Phase 0 action potentials at the AV node is not dependent on fast sodium channels, but instead are generated by the entry of calcium into the cell through slow-inward, L-type calcium channels.
www.cvphysiology.com /Arrhythmias/A003.htm   (775 words)

  
 Common Heart Problems - AV Nodal Re-entrant Tachycardia | Advocate Health Care
AV nodal re-entrant tachycardia is an arrhythmia, or abnormal heart rhythm.
The SA node is a group of cells located in the upper right chamber of the heart.
The AV node is another group of cells which is located between the upper and lower chambers of the heart.
www.advocatehealth.com /system/info/library/articles/heartcare/common/avnodal.html   (0 words)

  
 Information on atrial fibrillation (abnormality in the heart rhythm) produced by medical doctors
The AV node serves as an electrical relay station between the atria and the ventricles.
The same discharges then pass through the AV node to reach the ventricles, traveling through the special tissues of the ventricles and causing the ventricles to contract.
In people with a normal AV node, the rate of ventricular contraction in untreated AF usually ranges from 80 to 180 beats/minute; the higher the transmission, the higher the heart rate.
www.medicinenet.com /atrial_fibrillation/article.htm   (1197 words)

  
 AV Node
Also known as the Aschoff-Tawara node, the AV node is a group of cells located at the center of the heart between the atria and ventricles.
The AV Node takes the signal from the SA Node, slows the signal down and regulates it, and then sends the electrical impulses from the atria to the ventricles.
The AV node regulates the signals to the ventricles to prevent rapid conduction (atrial fibrillation), as well as making sure that the atria are empty and closed before stimulating the ventricles.
www.cts.usc.edu /zglossary-avnode.html   (105 words)

  
 Glossary of Terms (A)
Electrical signals from the sinoatrial (SA) node travel through the AV node before moving to the rest of the heart.
When the AV node is blocked, it can result in a slow or heartbeat called heart block.
The AV valve between the left atrium and the left ventricle is called the mitral valve.
www.medtronic.com /corporate/glossary/a.html   (756 words)

  
 Introduction: Arrhythmias and Conduction Disorders: Merck Manual Professional
AV nodal transmission time is heart-rate dependent and is modulated by autonomic tone and circulating catecholamines to maximize cardiac output at any given atrial rate.
Digoxin shortens atrial and ventricular refractory periods and is vagotonic, thereby prolonging AV nodal conduction and AV nodal refractory periods.
Thus, heart rate is slowed, the PR interval is lengthened, and the AV node transmits rapid atrial depolarizations at a lower frequency.
www.merck.com /mmpe/print/sec07/ch075/ch075a.html   (0 words)

  
 Overview of Pediatric Pacemakers and Defibrillators
The sinus node is the usual pacemaker of the heart due to its high frequency of automatic spontaneous depolarizations.
Second-degree AV block reflects intermittent conduction block, and is diagnosed when at least one atrial beat (P wave) is not followed by a ventricular beat (QRS complex).
AV block may be due to benign functional changes in the AV node (e.g., enhanced vagal tone), or may reflect intrinsic disease (e.g., inflammation or surgical trauma), medication effect, or abnormal blood chemistries affecting the AV node or HPS.
www.childsdoc.org /Fall99/pacemkrsdefib.asp   (3221 words)

  
 PVI - AFF
AV node nodal ablation is a palliative rather than curative procedure, used in patients in which it is difficult to control the ventricular rate (pulse rate) with medications.
When the AV node or His bundle is ablated (cauterized), the rapid electrical impulses of atrial fibrillation are prevented from going from the atrium (top chambers) to the ventricles (bottom chambers) of the heart.
Because AV nodal ablation disrupts the normal electrical connection between the upper and lower chambers of the heart, a pacemaker must be placed to provide a backup electrical system for the heart.
www.affacts.org /Research/pvi_avn_abl.html   (248 words)

  
 AV Blocks
Blood is supplied to the AV node by the RCA in 90% of the population and from the circumflex in 10%.
AV blocks are caused by suppression of impulse conduction from the atria to the ventricles.
The PR interval progressively prolongs until the AV node remains refractory too long to conduct an impulse; a QRS complex is dropped, producing a pause in the rhythm.
www.med.umich.edu /ccmu/avblock.htm   (746 words)

  
 Pacemaker - Indications - CardiologyChannel
Although the function of the AV node is actually quite complex, it basically conducts electrical impulses from the atria down into the ventricles.
As the AV node begins to malfunction, it may no longer be able to conduct every impulse that reaches it from the atria down into the ventricles.
When the AV node malfunctions to the point that too few electrical impulses are being conducted or when it appears there is a risk that the AV node may stop working completely, a pacemaker is implanted.
www.cardiologychannel.com /pacemaker/indications.shtml   (504 words)

  
 Radiofrequency catheter ablation for atrial fibrillation
After AV node ablation, a permanent pacemaker is needed to regulate the heart rhythm, and continued anticoagulation therapy is also needed.
Radiofrequency catheter ablation of the AV node is occasionally used when persistent chronic atrial fibrillation does not respond to treatment with medication and symptoms continue to be bothersome.
AV node ablation followed by pacemaker implantation reduces cardiac symptoms and improves exercise tolerance, quality of life, and the amount of blood pumped with each heartbeat (ejection fraction).
www.webmd.com /hw/heart_disease/hw159948.asp?printing=true   (909 words)

  
 Atrial fibrillation: Causes - MayoClinic.com
A split second later, as the signal passes through the AV node through the right and left bundle branches to the ventricles, the ventricles contract, pumping blood out to your body.
The AV node — the electrical connection between the atria and the ventricles — is overloaded with impulses trying to get through to the ventricles.
The reason is because the AV node is like a highway on-ramp — only so many cars can get on at one time.
www.mayoclinic.com /health/atrial-fibrillation/DS00291/DSECTION=3   (497 words)

  
 Stagning av masten | Amigosidan.se
Jag kontaktade Selden mast och fick ett blixtsnabbt svar.
Att byta plats på infästningen i däck av övre och undre vanten är uppenbarligen en riktigt dålig idee (om någon mer än jag nu funderat på detta).
På en skiss av en 7/8 rigg är toppvant och undervant fästade vid ett gemensamt beslag akter om mastfoten.
www.amigosidan.se /node/154   (0 words)

  
 Atrioventricular Node Reentry With `Smooth' AV Node Function Curves : A Different Arrhythmia Substrate? -- Sheahan et ...
Atrioventricular Node Reentry With `Smooth' AV Node Function Curves
Electrophysiological properties of the atrioventricular node and ageing: evidence of a lower incidence of dual nodal pathways in the elderly
Noninvasive Diagnosis of Dual AV Node Physiology in Patients With AV Nodal Reentrant Tachycardia by Administration of Adenosine-5'-Triphosphate During Sinus Rhythm
circ.ahajournals.org /cgi/content/abstract/93/5/969   (623 words)

  
 Women's Cardiovascular Center - Abnormal Heartbeats (arrhythmia) in Women
The impulse then reaches the atrioventricular (AV) node, which acts as an electrical bridge allowing impulses to travel from the atria to the ventricles.
The signal starts in the SA node but may be slow or delayed in progressing to the atria, causing a very slow or irregular heart beat.
Instead of the AV node sending the impulse down one pathway, there are two pathways through the AV node.
www.clevelandclinic.org /heartcenter/pub/women/conditions_arrhythmia.htm   (0 words)

  
 FAQ | Reseguiden.se
Pengarna tjänar vi genom att du klickar på något av de reseföretag som vi presenterar.
Hör av dig om du har synpunkter på något av reseföretagen på Reseguiden.se.
Vår strävan är att erbjuda ett det största och bästa utbudet av resor på den Svenska marknaden.
www.reseguiden.se /xpress/?q=node/72   (0 words)

  
 Re: Re: Re:AV Node Ablation
Thank you for your reply to my question relating to AV Node ablation and implantation of pacemaker for inappropriate sinus tachycardia.
An EPS and sinus node modification were carried out in February but symptoms still persist.
This is why so many people have a hard time finding the correct diagnosis as so few physicians know that this is one of the halmarks of this disorder.
www.medhelp.org /forums/cardio/archive/12515.html   (649 words)

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