Radionuclide evaluation of right ventricular wall motion after surgery in tetralogy of Fallot |
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Authors: | Osman Ratib Beat Friedli Alberto Righetti Ingrid Oberhaensli |
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Institution: | (1) Cardiology Center and Pediatric Cardiac Unit, Department of Pediatrics, Geneva University Hospital, Switzerland |
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Abstract: | Summary Regional wall motion patterns in tetralogy of Fallot and its postoperative modifications by electrical and hemodynamic factors
were assessed by Fourier analysis of gated radionuclide angiograms in 24 studies performed in children after surgical correction
of tetralogy of Fallot. The range of right ventricular (RV) phase angles (standard deviation of the peak SDP] of RV) as well
as the difference between RV and LV (ΔMPh) were used as indices of the synchronicity of wall motion and were correlated with
RV apical electrical activation time determined by endocardial electrical mapping. Postoperative studies were divided into
two groups according to apical activation: (a) those involving right bundle branch block (RBBB) (nine patients), and (b) those
involving distal RBBB (15 patients). ΔMPh was longer in proximal than in distal RBBB. Best discrimination between the two
groups was obtained with SDP of RV (proximal=24°±3°, and distal=17°±2°;p<0.0001). These results showed that the range of ventricular phases measured by the SD of the phase distribution of the right
ventricle is a good index for distinguishing between proximal and distal RBBB after cardiac surgery. |
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Keywords: | Phase analysis Radionuclide angiography Tetralogy of Fallot Right bundle branch block |
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