title: Should an abnormal electrocardiogram be a cause for worry?  Here's the truth about left and right bundle branch blocks that show up on some ECG readings.
mesh_terms: D002036:Bundle of His / Q000503:physiopathology*; D002037:Bundle-Branch Block / Q000175:diagnosis* / Q000517:prevention & control; D042241:Early Diagnosis; D004562:Electrocardiography; D006304:Health Status; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans