Pulmonary Right Ventricular Resynchronization in Congenital Heart Disease: Acute Improvement in Right Ventricular Mechanics and Contraction Efficiency
Language English Country United States Media print
Document type Journal Article
PubMed
28877886
DOI
10.1161/circimaging.117.006424
PII: CIRCIMAGING.117.006424
Knihovny.cz E-resources
- Keywords
- cardiac resynchronization therapy, echocardiography, heart defects, congenital, pediatrics, right ventricle, tetralogy of Fallot,
- MeSH
- Biomechanical Phenomena MeSH
- Bundle-Branch Block diagnostic imaging etiology physiopathology therapy MeSH
- Time Factors MeSH
- Child MeSH
- Ventricular Dysfunction, Right diagnostic imaging etiology physiopathology MeSH
- Electrophysiologic Techniques, Cardiac MeSH
- Electrocardiography MeSH
- Tetralogy of Fallot complications diagnostic imaging physiopathology surgery MeSH
- Ventricular Function, Right * MeSH
- Hemodynamics MeSH
- Cardiac Surgical Procedures * MeSH
- Myocardial Contraction * MeSH
- Humans MeSH
- Adolescent MeSH
- Recovery of Function MeSH
- Echocardiography, Doppler, Pulsed MeSH
- Cardiac Catheterization MeSH
- Cardiac Resynchronization Therapy * MeSH
- Treatment Outcome MeSH
- Check Tag
- Child MeSH
- Humans MeSH
- Adolescent MeSH
- Male MeSH
- Female MeSH
- Publication type
- Journal Article MeSH
BACKGROUND: Electromechanical discoordination may contribute to long-term pulmonary right ventricular (RV) dysfunction in patients after surgery for congenital heart disease. We sought to evaluate changes in RV function after temporary RV cardiac resynchronization therapy. METHODS AND RESULTS: Twenty-five patients aged median 12.0 years after repair of tetralogy of Fallot and similar lesions were studied echocardiographically (n=23) and by cardiac catheterization (n=5) after primary repair (n=4) or after surgical RV revalvulation for significant pulmonary regurgitation (n=21). Temporary RV cardiac resynchronization therapy was applied in the presence of complete right bundle branch block by atrial-synchronized RV free wall pacing in complete fusion with spontaneous ventricular depolarization using temporary electrodes. The q-RV interval at the RV free wall pacing site (mean 77.2% of baseline QRS duration) confirmed pacing from a late activated RV area. RV cardiac resynchronization therapy carried significant decrease in QRS duration (P<0.001) along with elimination of the right bundle branch block QRS morphology, increase in RV filling time (P=0.002), pulmonary artery velocity time integral (P=0.006), and RV maximum +dP/dt (P<0.001), and decrease in RV index of myocardial performance (P=0.006). RV mechanical synchrony improved: septal-to-lateral RV mechanical delay decreased (P<0.001) and signs of RV dyssynchrony pattern were significantly abolished. RV systolic stretch fraction reflecting the ratio of myocardial stretching and contraction during systole diminished (P=0.001). CONCLUSIONS: In patients with congenital heart disease and right bundle branch block, RV cardiac resynchronization therapy carried multiple positive effects on RV mechanics, synchrony, and contraction efficiency.
References provided by Crossref.org
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