Empiric Versus Imaging Guided Left Ventricular Lead Placement in Cardiac Resynchronization Therapy

Inclusion Criteria

• •Symptomatic heart failure (New York Heart Association functional class II - IV) despite stabile optimal medical therapy.
• •ECG with QRS ≥ 120 milliseconds and left bundle branch block (LBBB) or paced QRS ≥ 180 milliseconds.
• •LV systolic dysfunction (Ejection Fraction ≤ 35%).
• •written informed consent.