The study aims to demonstrate that left ventricular (LV) pacing site optimisation using high frequency (HF) ECG improves LV reverse remodeling response to Cardiac Resynchronization Therapy (CRT), compared with Q-LV (Q-wave on the surface ECG to LV Electrogram) measurement after 6 months of treatment.~Participants will be implanted with a Cardiac Resynchronisation Therapy device with either pacemaker or defibrillator function.~The study is a single-Centre, randomized, prospective trial. One hundred and eighty participants will be assigned to either the treatment (HF-ECG guided LV pacing site optimisation) or control (Q-LV guided LV pacing site optimisation) arm, employing a 1:1 randomization. The participants will be followed up for a period of 6 months.
The research aims to compare the response of Cardiac Resynchronisation Therapy (CRT) using HF ECG guided or the conventional method of Q-LV measurement guided optimisation for left ventricular, pacing site.