title: To the Editor--Supernormal conduction or masked bundle branch block?
authors.affiliation: Toronto General Hospital Cardiology Department, Toronto, Ontario, Canada. Electronic address: nicholas.jackson@uhn.ca.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Jackson
authors.affiliation: Toronto General Hospital Cardiology Department, Toronto, Ontario, Canada.
authors.forename: Karthik
authors.initials: K
authors.lastname: Viswanathan
authors.affiliation: Toronto General Hospital Cardiology Department, Toronto, Ontario, Canada.
authors.forename: Andreu
authors.initials: A
authors.lastname: Porta-Sanchez
authors.affiliation: Toronto General Hospital Cardiology Department, Toronto, Ontario, Canada.
authors.forename: Krishnakumar
authors.initials: K
authors.lastname: Nair
mesh_terms: D002037:Bundle-Branch Block / Q000503:physiopathology*; D004562:Electrocardiography; D006329:Heart Conduction System / Q000503:physiopathology*; D006801:Humans; D013617:Tachycardia, Supraventricular / Q000503:physiopathology*