• Atrioventricular nodal re-entry tachycardia, which is caused by a dual AV node physiology and AVNRT can only occur in people with it, however almost half of the population have it, though only a few of them will develop AVNRT at some point in life. (wikipedia.org)
  • Various types of SVT include atrioventricular nodal reentry tachycardia (AVNRT), atrioventricular reentry tachycardia (AVRT), atrial tachycardia (AT), inappropriate sinus tachycardia (IAST), and junctional ectopic tachycardia (JET). (kcheartrhythm.com)
  • Ear drops?AutoPap: Computer-assisted cytology interpretation system?AV: Aortic valve?AV: Atrioventricular?A-V: Arteriovenous?AVERT: Atorvastatin Versus Revascularization treatment?AVID: ?AVM: Arteriovenous Malformation?AVNRT: AV nodal reentry tachycardia?AVP: Arginine vasopressin?AVR: Aortic valve replacement?AVR: Augmented V lead, right arm (ECG)?AVRT: ?AVS: Arteriovenous shunt?AWS: Alcohol withdrawal syndrome?AXR: Abdominal X ray?AZF: Azoospermia factor genes?AZT: Azidothymidine (zidovudine)?B & O: Belladonna and opium?B Bx. (kuwaitpharmacy.com)
  • Though atrial fibrillation is the most common cause of TIC, several tachycardias and arrhythmias have been associated with the disease. (wikipedia.org)
  • In particular, when the atrial rate is around 200 bpm, it is challenging to distinguish between atypical flutter and tachycardia due to an atrial macro‐reentry (MAT‐MR). In fact, these two arrhythmias could be considered the same (see Chapter 15 , Atrial flutter: ECG findings) from a morphological point of view, but different in terms of definitive treatment with ablation. (thoracickey.com)
  • Di Biase L, Gianni C, Bagliani G, Padeletti L. Arrhythmias involving the atrioventricular junction. (medscape.com)
  • Fast arrhythmias that originate from the lower chambers (i.e., the ventricles) are called ventricular tachycardias. (cincinnatichildrens.org)
  • Various types of inherited/congenital cardiac arrhythmias include long QT syndrome (LQTS), Brugada syndrome, hypertrophic obstructive cardiomyopathy (HOCM, also known as sudden cardiac death), arrhythmogenic right ventricular dysplasia/cardiomyopathy (ARVD/C), and catecholaminergic polymorphic ventricular tachycardia (CPTV). (kcheartrhythm.com)
  • Surface ECG characteristics of arrhythmias whose underlying mechanism is reentry include 1) paroxysmal onset and cessation, 2) very rapid rates (400 to 500 min -1 possible), and 3) initiation and termination by a premature beat (most often). (vin.com)
  • Figure 18.2 shows the morphology of atrial activation waves in the different supraventricular tachycardias with regular and monomorphic waves (see also Table 15.5 ) and Figures 18.3 and 18.4 show the different algorithms that, depending on whether atrial activity is present or not, allow us to determine the type of active supraventricular arrhythmia with narrow QRS and regular ( Figure 18.3 ) or irregular RR ( Figure 18.4 ). (thoracickey.com)
  • We focused in on supraventricular tachycardias (SVT) and defined some of them and reviewed pathophysiology. (wchcmr.org)
  • The supraventricular tachycardias are summarized below. (wchcmr.org)
  • Supraventricular tachycardias must be differentiated from each other because the management strategies may vary. (wikidoc.org)
  • This week in morning report we discussed a case of a woman presenting with palpitations leading to syncope with an ultimate diagnosis of AV-nodal re-entrant tachycardia. (wchcmr.org)
  • Atrioventricular nodal re-entrant tachycardia is an uncommon arrhythmia in children. (cambridge.org)
  • We analyzed the clinical and electrophysiological features, and the final outcome, in 19 children affected by typical atrioventricular nodal re-entrant tachycardia diagnosed by a transoesophageal electrophysiological study. (cambridge.org)
  • Our data indicates a relatively benign outcome in this group of children and adolescents with atrioventricular nodal re-entrant tachycardia. (cambridge.org)
  • The blood supply of the AV node is from the atrioventricular nodal branch. (wikipedia.org)
  • The atrioventricular node delays impulses by approximately 0.09s. (wikipedia.org)
  • Cystic tumour of atrioventricular nodal region (CTAVN) CTAVN is of endodermal origin and occurs exclusively in the area of the AV node, tricuspid valve, and interatrial septum. (wikipedia.org)
  • AV dissociation may occur when a subsidiary pacemaker in the AV node or the ventricle overtakes the sinus node for impulse initiation due to slowing of the sinus node, or it may occur when a subsidiary site (ie, the ventricle) beats faster than the sinus node, such as in ventricular tachycardia. (medscape.com)
  • Significant slowing of the sinus node allows for a subsidiary pacemaker (atrioventricular [AV] junction) to activate, causing AV dissociation. (medscape.com)
  • Junctional bradycardia due to profound sinus node dysfunction. (medscape.com)
  • Accelerated junctional rhythm is a result of enhanced automaticity of the AVN that supersedes the sinus node rate. (medscape.com)
  • Key Words * atrioventricular node * tachycardia reentry * action potentials * radiofrequency ablation tissues of origin of these potentials. (pdfkul.com)
  • Because of its selective class III antiarrhythmic effect, dofetilide has no effect on atrioventricular conduction or sinus node function. (bmj.com)
  • There are several classification systems for supraventricular tachycardia , based on site of origin, QRS width, pulse regularity, and AV node dependence. (wikidoc.org)
  • The atrioventricular (AV) node, His bundle, and bundle branches provide the only normal pathway for transmission of impulses between the atria and ventricles. (mhmedical.com)
  • Abnormalities in impulse formation result in sinus bradycardia and tachycardia, premature atrial and ventricular contractions, and ectopic or automatic rhythms from the atria, AV node, or ventricles. (mhmedical.com)
  • After modulation of the atrioventricular node in general, an intrinsic escapement rhythm at the junctional level can remain, the frequency of which is generally between 30 and 50 bpm. (af-ablation.org)
  • Tachycardia-induced cardiomyopathy (TIC) is a disease where prolonged tachycardia (a fast heart rate) or arrhythmia (an irregular heart rhythm) causes an impairment of the myocardium (heart muscle), which can result in heart failure. (wikipedia.org)
  • People with TIC may have symptoms associated with heart failure (e.g. shortness of breath or ankle swelling) and/or symptoms related to the tachycardia or arrhythmia (e.g. palpitations). (wikipedia.org)
  • Thus, TIC is typically diagnosed when (1) tests have excluded other causes of cardiomyopathy and (2) there is improvement in myocardial function after treatment of the tachycardia or arrhythmia. (wikipedia.org)
  • Treatment of TIC can involve treating the heart failure as well as the tachycardia or arrhythmia. (wikipedia.org)
  • While class I antiarrhythmic drugs are effective in treating this form of tachycardia, there is a reluctance to use these agents, especially in patients with structural heart disease, because of potential proarrhythmia or undesirable side effects-as seen in the cardiac arrhythmia suppression trial (CAST). (bmj.com)
  • Tuohy S, Saliba W, Pai M, Tchou P. Catheter ablation as a treatment of atrioventricular block. (medscape.com)
  • Michiel J. Janse, MD, PhD Background Atrioventricular junctional (AV nodal) reentrant tachycardia can be cured by catheter ablation of the slow pathway, which is part of the reentrant circuit. (pdfkul.com)
  • HL double potentials were found along the Atrioventricular junctional reentrant tachycardia ~4 (AVJRT) can be cured by catheter ablation of 1k sites near the coronary sinus orifice.1-3 This technique damages the slow pathway, part of the reentrant circuit used by this tachycardia. (pdfkul.com)
  • Junctional rhythm Gray, Huon H. (wikipedia.org)
  • This rhythm strip reveals interference atrioventricular dissociation, as there is a P wave conducting to the ventricle in the third and seventh beats, whereas the P wave fails to conduct to the ventricle in the other beats. (medscape.com)
  • Accelerated junctional rhythm is present in this patient. (medscape.com)
  • The junctional rhythm initiates within the AV nodal tissue. (medscape.com)
  • Young healthy individuals, especially those with increased vagal tone during sleep, are often noted to have periods of junctional rhythm that is completely benign, not requiring any intervention. (medscape.com)
  • Alteration in calcium metabolism in the sarcoplasmic reticulum causes accelerated junctional rhythm. (medscape.com)
  • For instance, in the case of chaotic atrial tachycardia (see Figure 15.21 ), by definition, there is no dominant rhythm (see Chapter 15 , Chaotic atrial tachycardia). (thoracickey.com)
  • In sinus rhythm, the cadence is regular, although it usually shows a little variability, especially during respiration (see Chapter 15 , Sinus tachycardia). (thoracickey.com)
  • Calcium dynamics and the mechanisms of atrioventricular junctional rhythm. (medscape.com)
  • Seino Y, Sato N, Fukui K, Ishikawa J, Nakagawa M, Nomura T. Transient systolic anterior motion with junctional rhythm after mitral valve repair in the intensive care unit. (medscape.com)
  • What is a Fast Heart Rhythm or Tachycardia? (cincinnatichildrens.org)
  • If the heart rate exceeds this limit, a fast heart rhythm (tachycardia) exists. (cincinnatichildrens.org)
  • When the source of the fast heart rhythm is the lower chambers (ventricles), ventricular tachycardia (VT) is present. (cincinnatichildrens.org)
  • Atrial tachycardia is a regular rhythm caused by the consistent, rapid atrial activation from a single atrial focus. (msdmanuals.com)
  • Tachyarrhythmia is used to describe tachycardia in the presence of cardiac rhythm abnormality. (mims.com)
  • It treats heart rhythm problems like atrial fibrillation or supraventricular tachycardia. (kaiserpermanente.org)
  • The abrupt change from a fast, regular rhythm to a slower, irregular rhythm is evidence that the tachycardia was due to a reentrant circuit, and not sinus tachycardia. (ecgguru.com)
  • Junctional rhythms are common in patients with sick sinus syndrome or in patients who have significant bradycardia that allows the AV nodal region to determine the heart rate. (medscape.com)
  • Junctional escape rhythms, which are common in younger and/or athletic individuals during periods of increased vagal tone (eg, sleep), occur equally in males and females. (medscape.com)
  • The usual mechanism is reentry, but abnormally triggered rhythms occur. (health.am)
  • During a mean follow-up period of 41 months, 2 children with rare, but sustained, episodes of tachycardia that initially had not been treated were submitted to radiofrequency transcatheter ablation. (cambridge.org)
  • Among children treated pharmacologically, 1 teenager was submitted to radiofrequency transcatheter ablation on the basis of parental choice, 3 children have discontinued medical therapy recording only sporadic episodes of tachycardia, and 2 children are still treated with antiarrhythmic drugs. (cambridge.org)
  • Pharmacological treatment of supraventricular tachycardia remains a common approach despite the increased use of radiofrequency ablation. (bmj.com)
  • these patterns confirm a reentry mechanism for the ectopic beat. (health.am)
  • Re-entry , the other form of abnormal impulse conduction, is an important mechanism underlying supraventricular tachycardia in infants. (mhmedical.com)
  • Optimal surface electrocardiogram lead for identification of the mechanism of supraventricular tachycardia in children. (medscape.com)
  • Delayed termination and transformation of a supraventricular tachycardia-What is the mechanism? (jefferson.edu)
  • In the case of monomorphic atrial tachycardia of ectopic focus (MAT‐EF), the algorithm shown in Figure 15.10 allows us to localize the atrial origin of the ectopic P′ wave (Kistler et al . (thoracickey.com)
  • Atrioventricular conduction disease (AV block) describes impairment of the electrical continuity between the atria and ventricles. (wikipedia.org)
  • Treatment related side effects were reported in four patients, one with a new sustained incessant supraventricular tachycardia. (bmj.com)
  • Automatic tachycardias are usually incessant (ie, they are almost always present). (mhmedical.com)
  • Although sinus tachycardia also originates in that geographic region many cardiologists do not consider sinus tachycardia as a type of SVT as sinus tachycardia is, in almost all instances, a temporary physiologic response to external stimuli (e.g., stress, excitement, exercise, or hypovolemia). (vin.com)
  • A generic expression for any tachycardia that originates above the BUNDLE OF HIS. (jefferson.edu)
  • Late-gadolinium enhancement on cardiac MRI indicates the presence of fibrosis and scarring, and may be evidence of cardiomyopathy not due to tachycardia. (wikipedia.org)
  • These junctional tachycardias are most often observed in the setting of digitalis toxicity, recent cardiac surgery, acute myocardial infarction, or isoproterenol infusion. (medscape.com)
  • In nonacute settings, most patients with ventricular tachycardia have known or easily detectable cardiac disease, and the finding of ventricular tachycardia is an unfavorable prognostic sign. (health.am)
  • Abnormalities in any of these factors can result in bradycardia or tachycardia that are not related to any specific cardiac disorder. (mhmedical.com)
  • The diagnosis of TIC is made after excluding other causes of cardiomyopathy and observing resolution of the left ventricular systolic dysfunction with treatment of the tachycardia. (wikipedia.org)
  • Sustained tachyarrhythmias may eventually cause myocardial dysfunction, which is known as tachycardia-induced cardiomyopathy. (mhmedical.com)
  • Ventricular depolarization starts earlier than expected (it starts where the accessory pathway inserts in the ventricular tachycardia). (wchcmr.org)
  • When atrial flutter is conducted to the ventricle in a 1:1 fashion, the electrocardiogram may resemble ventricular tachycardia. (medscape.com)
  • Review of diagnosis, treatment, and outcome of fetal atrial flutter compared with supraventricular tachycardia. (medscape.com)
  • First, in patients presenting with both tachycardia and cardiomyopathy, it can be difficult to distinguish which is the causative agent. (wikipedia.org)
  • Ventricular tachycardia is a frequent complication of acute myocardial infarction and dilated cardiomyopathy but may occur in chronic coronary disease, hypertrophic cardiomyopathy, mitral valve prolapse, myocarditis, and in most other forms of myocardial disease. (health.am)
  • Therapies that produce only transient effects, such as direct current (DC) cardioversion and administration of adenosine, do not terminate automatic tachycardias. (mhmedical.com)
  • This strip shows a supraventricular tachycardia, rate 196 bpm, after adenosine was administered to the patient. (ecgguru.com)
  • Heart block, which may occur with AV dissociation, is discussed in detail in the Medscape Drugs & Diseases article Atrioventricular Block . (medscape.com)
  • Block can occur at any location, but atrioventricular block is the most common site. (mhmedical.com)
  • Atrioventricular (AV) dissociation is a condition whereby the atria and the ventricles activate independently of each other. (medscape.com)
  • Ventricular tachycardia (VT) - This is when abnormal electrical signals in the ventricles (lower heart chambers) can cause the heart's electrical activity to beat faster than normal and out of sync with the atria (upper chambers). (kcheartrhythm.com)
  • Atrioventricular Block Atrioventricular (AV) block is partial or complete interruption of impulse transmission from the atria to the ventricles. (msdmanuals.com)
  • Self-administered intranasal etripamil using a symptom-prompted, repeat-dose regimen for atrioventricular-nodal-dependent supraventricular tachycardia (RAPID): a multicentre, randomised trial. (jefferson.edu)
  • Mechanisms include enhanced atrial automaticity and intra-atrial reentry. (msdmanuals.com)
  • Tachyarrhythmias secondary to triggered activity may not have specific morphologic ECG characteristics, however, Torsade de Pointes (polymorphic ventricular tachyarrhythmia with "twisting of the points") and inherited superfast ventricular tachycardia in German shepherds are examples of triggered activity caused by early or delayed after depolarizations. (vin.com)
  • Typical ECG findings with SVT include narrow-complex tachycardia, electrical alternans, evidence of atrial activation (P', F, or f waves), and response to treatments that slow down AV conduction. (vin.com)
  • TIC has been associated with supraventricular tachycardia (SVT), ventricular tachycardia (VT), frequent premature ventricular contractions (PVCs), rapid atrial and ventricular pacing, and left bundle branch block. (wikipedia.org)
  • Fifty one patients with electrically inducible atrioventricular re-entrant tachycardia were allocated to one of five doses of dofetilide (1.5, 3, 6, 9, and 15 μg/kg), two thirds of the dofetilide dose being given over a 15 minute loading period and the remainder over a 45 minute maintenance period. (bmj.com)
  • Ventricular tachycardia is defined as three or more consecutive ventricular premature beats. (health.am)
  • Ventricular premature beats (VPBs) were more frequent during daytime and atrioventricular blocks (AVBs) were more frequent at night in all species. (bvsalud.org)
  • Supraventricular tachycardia (SVT) - These are fast heartbeats that originate in the atria (upper heart chambers). (kcheartrhythm.com)
  • CONCLUSIONS Dofetilide shows promise as an agent for the prevention of atrioventricular re-entrant tachycardia in patients without structural heart disease. (bmj.com)