title: Latency during left ventricular pacing from the lateral cardiac veins: a cause of ineffectual biventricular pacing.
abstract: We report three patients with cardiomyopathy and pronounced stimulus to QRS latency during left ventricular (LV) pacing from an epicardial cardiac vein. Delayed LV activation during simultaneous biventricular pacing produced an electrocardiographic pattern dominated by right ventricular stimulation. Hemodynamic parameters improved immediately after advancing LV stimulation (in one patient) or pacing the LV only (in two patients) coupled with dramatic improvement of heart failure symptoms.
authors.affiliation: Arrhythmia Service and Division of Cardiology, Tampa General Hospital and University of South Florida, Tampa, Florida 33606, USA. bherweg@hsc.usf.edu
authors.forename: Bengt
authors.initials: B
authors.lastname: Herweg
authors.forename: Arzu
authors.initials: A
authors.lastname: Ilercil
authors.forename: Chris
authors.initials: C
authors.lastname: Madramootoo
authors.forename: Sendhil
authors.initials: S
authors.lastname: Krishnan
authors.forename: Debbie
authors.initials: D
authors.lastname: Rinde-Hoffman
authors.forename: Mark
authors.initials: M
authors.lastname: Weston
authors.forename: Anne B
authors.initials: AB
authors.lastname: Curtis
authors.forename: S Serge
authors.initials: SS
authors.lastname: Barold
mesh_terms: D002304:Cardiac Pacing, Artificial; D003331:Coronary Vessels / Q000503:physiopathology; D004562:Electrocardiography; D006333:Heart Failure / Q000503:physiopathology* / Q000628:therapy*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014680:Veins / Q000503:physiopathology