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Echocardiographic motions of right ventricular anterior wall (RVAW) were investigated in 71 patients with Wolff-Parkinson-White (WPW) syndrome. According to the criteria of Rosenbaum et al the electrocardiograms were classified as type A in 35 patients and type B in 36. Sixteen type B patients exhibited abnormal RVAW motion, which was characterized by an early onset of the posterior movement before S1 andl also by a premature peak formation before S2. A small step or hump nearly coincident with S1 was observed in 10 of these 16 patients. These findings seem to suggest that both contraction and relaxation of RVAW begin earlier than normal due to anterior right ventricular pre-excitation. RVAW motion was normal in all of type A patients. Echocardiographic investigation of RVAW motion appears to be useful in non-invasive estimation of the site of pre-excitation, especially in type B WPW patients.
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