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LV dysfunction did not improve despite optimal medical therapy for dilated cardiomyopathy. Twelve\u2010lead electrocardiography revealed a normal PR interval (138 ms) with a small delta\u2010like wave in V2, but not a typical diagnostic wave that could be diagnosed as Wolff\u2013Parkinson\u2013White (WPW) syndrome by an electrocardiogram auto\u2010analysis. Transthoracic echocardiography showed a remarkable asynchronous septal motion. An electrophysiological study was performed to exclude WPW syndrome. An accessory pathway (AP) was revealed on the lateral wall of the right ventricle, and radiofrequency catheter ablation was successfully performed to disconnect the AP. Thereafter, the dyssynchrony disappeared, and LV function improved. The intrinsic atrioventricular nodal conduction was very slow (A\u2010H, 237 ms). The results of electrocardiogram auto\u2010analysis could not be used to confirm the diagnosis of WPW syndrome because of the atypical delta wave. Conduction via the right lateral AP caused electrical dyssynchrony in the LV. This case suggests that atypical delta waves should be evaluated without depending on electrocardiographic auto\u2010analyses in patients with LV dysfunction accompanied by dyssynchrony.<\/jats:p><\/jats:sec>","DOI":"10.1016\/j.joa.2014.03.011","type":"journal-article","created":{"date-parts":[[2014,5,10]],"date-time":"2014-05-10T02:30:48Z","timestamp":1399689048000},"page":"50-54","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":8,"title":["A young patient with atypical type\u2010B Wolff\u2013Parkinson\u2013White syndrome accompanied by left ventricular 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