atrioventricular nodal reentrant tachycardia

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Related to AVNRT: AVRT

atrioventricular nodal reentrant tachycardia

AVNRT Cardiology The most common form of paroxysmal SVT Treatment Antiarrhythmics are rarely successful; catheter ablation of the fast P wave causes complete heart block in 10%, requiring pacemaker placement; selective catheter ablation of the atrial end of the slow PW using radiofrequency current may eliminate AVNRT with little risk of AV block. See Supraventricular tachycardia.
McGraw-Hill Concise Dictionary of Modern Medicine. © 2002 by The McGraw-Hill Companies, Inc.

atrioventricular nodal reentrant tachycardia

Abbreviation: AVNRT
The most common supraventricular tachycardia, resulting from abnormal conduction of electrical impulses through a self-sustaining circuit in the atrioventricular node. It occurs more often in women than in men, often in their twenties. The heart rate is usually between 150 and 250 bpm.
Synonym: junctional reciprocating tachycardia See: re-entry
See also: tachycardia
Medical Dictionary, © 2009 Farlex and Partners
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We have managed to establish that in patients with AVNRT reduction in QoL parameters took place predominantly due to changes in the physical component than to those in the mental one (38.6%, scoring 50.1 [+ or -] 2.29 versus 24.8%, scoring 62.1 [+ or -] 3.35; P=0.004).
As analysis of data obtained by means of the SF-36 health survey shows, atrioventricular nodal reentrant tachycardia (AVNRT) causes reduction in quality of life involving parameters of both physical (38.6%) and emotional (24.8%) components.
(30,31) ST depression of more than 2 mm or T wave inversion is more common in AVRT than in AVNRT. (32) QRS alternans, which refers to variations in QRS amplitude or direction with every other beat, has been reported to be indicative of AVRT, (33,34) but may in fact be a rate-dependent phenomenon that has little to do with the mechanism of tachycardias.
Sinus tachycardias and atrial tachycardias frequently demonstrate a "warm up" in rate, for instance, while AVNRT and AVRT are often triggered by premature atrial contractions.
Patients with AVNRT and sinus node dysfunction exhibit characteristic electrophysiological alterations of both AV nodal pathways.
This could indicate towards new management strategies in AVNRT, in which slow pathway ablation has been a very effective treatment, with success rates of over 99% [15].
In 536 of the 800 patients the SVT substrate was an AVNRT (67%), in 236 patients an AVRT (29.5%) and in 28 patients an AT (3.5%) as shown in table-2.
Similarly, fluoroscopy time and number of RF energy applications in AVNRT were significantly shorter as compared to AVRT and AT (p 0.001).
Although the safety and effectiveness in a multicenter study presented at the meeting were not as good as those expected for radiofrequency (RF) ablation, panel members voting in favor agreed that the results "provided a reasonable assurance" that the device was safe and effective for patients with AVNRT.
The Freezor device was used to treat adults with AVNRT, atrioventricular reciprocating tachycardia (AVRT), or atrial fibrillation (AF), in a single-arm, nonrandomized study at 14 U.S.
Conclusion: In patients with AVNRT undergoing slow pathway ablation, the duration of atrial electrogram >40 ms and slow junctional beats with cycle length >550 ms during the application of RF energy describe the electrophysiological properties of successful slow pathway RF ablation.
Amac: Antriyoventrikuler nodal reenrant tasikardi (AVNRT) paroksizmal supraventrikuler tasikardili hastalarin yaklasik %60'inda gorulur.