Safety and Efficacy of Cardiac Shockwave Therapy in Patients Undergoing Coronary Artery Bypass Grafting

This randomised, controlled clinical trial aims to evaluate the safety and efficacy of Cardiac Shockwave Therapy (CAST-HF) in patients with ischaemic heart failure requiring surgical revascularization. The main questions to answer are: * Does cardiac shockwave therapy, in addition to CABG surgery, improve left ventricular ejection fraction? * Is cardiac shockwave therapy in addition to CAGB surgery safe? Participants will be randomised into intervention (cardiac shockwave therapy) and control (sham treatment with an inactive applicator) groups.