title: Concealed preexcitation and Wolff-Parkinson-White pattern possibly related to Mahaim fibers.
mesh_terms: D000368:Aged; D004071:Digitalis Glycosides / Q000494:pharmacology; D004562:Electrocardiography; D005260:Female; D006329:Heart Conduction System / Q000187:drug effects / Q000503:physiopathology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014927:Wolff-Parkinson-White Syndrome / Q000175:diagnosis / Q000503:physiopathology*
chemical_list: D004071:Digitalis Glycosides