RESEARCH SUPPORT, NON-U.S. GOV'T
Add like
Add dislike
Add to saved papers

Atrioventricular nodal reentrant tachycardia with 2:1 block in pediatric patients.

BACKGROUND: Episodic 2:1 block occurs in 9% of adults with atrioventricular nodal reentry tachycardia (AVNRT), but developmental differences in conduction physiology among children could influence this phenomenon.

OBJECTIVE: This study sought to characterize the frequency and mechanism of 2:1 block during AVNRT in the pediatric population.

METHODS: Records of 179 patients (mean age 13.5 +/- 3.4 years) undergoing ablation for AVNRT were reviewed.

RESULTS: Periods of 2:1 AVNRT were observed in 31 cases (17%). A His potential was visible on the blocked beats of 13, absent in 17, and undetermined in 1. Compared with 148 patients with exclusive 1:1 conduction, those with 2:1 AVNRT had: (1) longer baseline slow pathway refractory period (351 +/- 71 msec vs. 278 +/- 65 msec, P =.04), (2) shorter atrial cycle length during AVNRT (303 +/- 54 msec vs. 333 +/- 62 msec, P =.01), and (3) a higher incidence of bundle-branch aberration (35% vs. 18%, P =.03). Long-short oscillations in atrial cycle length were observed in 55% of patients during 2:1 AVNRT, but not during 1:1 AVNRT.

CONCLUSION: A pattern of 2:1 block occurs in 17% of pediatric patients with AVNRT undergoing ablation. Although this incidence is higher than in older patients, the mechanism appears identical. These data provide further evidence that functional block within or below the His bundle is the mechanism of 2:1 AVNRT, regardless of the presence of a His potential. Oscillations in atrial cycle length are common during 2:1 AVNRT in children and may contribute to the block pattern, but are not a requisite.

Full text links

For the best experience, use the Read mobile app

Group 7SearchHeart failure treatmentPapersTopicsCollectionsEffects of Sodium-Glucose Cotransporter 2 Inhibitors for the Treatment of Patients With Heart Failure Importance: Only 1 class of glucose-lowering agents-sodium-glucose cotransporter 2 (SGLT2) inhibitors-has been reported to decrease the risk of cardiovascular events primarily by reducingSeptember 1, 2017: JAMA CardiologyAssociations of albuminuria in patients with chronic heart failure: findings in the ALiskiren Observation of heart Failure Treatment study.CONCLUSIONS: Increased UACR is common in patients with heart failure, including non-diabetics. Urinary albumin creatininineJul, 2011: European Journal of Heart FailureRandomized Controlled TrialEffects of Liraglutide on Clinical Stability Among Patients With Advanced Heart Failure and Reduced Ejection Fraction: A Randomized Clinical Trial.Review

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app

Read by QxMD is copyright © 2021 QxMD Software Inc. All rights reserved. By using this service, you agree to our terms of use and privacy policy.

Get seemless 1-tap access through your institution/university

For the best experience, use the Read mobile app