Latency during left ventricular pacing from the lateral cardiac veins: a cause of ineffectual biventricular pacing.
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.
Herweg
Bengt
B
Arrhythmia Service and Division of Cardiology, Tampa General Hospital and University of South Florida, Tampa, Florida 33606, USA. bherweg@hsc.usf.edu
Ilercil
Arzu
A
Madramootoo
Chris
C
Krishnan
Sendhil
S
Rinde-Hoffman
Debbie
D
Weston
Mark
M
Curtis
Anne B
AB
Barold
S Serge
SS
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