Non-Invasive Method for Evaluation of Cardiac Resynchronization Therapy

Inclusion Criteria

• •Patients referred for CRT implantation or postoperative control at Oslo University Hospital based on the European Society of Cardiology (ESC) guidelines (2021), and criteria below:
• •1. Sinus rhythm.
• •2. New York Heart Association class II / III heart failure on diagnosis and on optimal medical therapy.
• •3. Left bundle branch block.
• •4. QRS duration ≥ 130 ms.
• •5. Left ventricular ejection fraction ≤ 40%.
• •6. Patients must have echocardiography examination before implantation
• •7. Informed consent obtained from the patient.