title: Left bundle branch block (LBBB) masks changes due to hyperkalemia: a myth.
abstract: Left bundle branch block masks ischemic changes but not those due to electrolyte imbalance. Peaking of T waves, prolongation of PR interval, diminution/absence of P wave, and widening of QRS complex can still be appreciated if one carefully compares the baseline ECG to the presenting ECG.
authors.affiliation: Cardiology, Geisinger Medical Center, Danville, PA, USA.
authors.forename: Anil
authors.initials: A
authors.lastname: Kumar
authors.forename: Neel
authors.initials: N
authors.lastname: Shah
authors.forename: Stephen
authors.initials: S
authors.lastname: Jesmajian
mesh_terms: D000369:Aged, 80 and over; D002037:Bundle-Branch Block / Q000503:physiopathology*; D003937:Diagnosis, Differential; D004562:Electrocardiography; D006801:Humans; D006947:Hyperkalemia / Q000503:physiopathology*; D008297:Male; D017202:Myocardial Ischemia / Q000175:diagnosis*