Question: Cardiac contractility modulation a treatment for patients with moderate to severe left ventricular systolic heart failure and is delivered by a medical device which uses electrical impulses, delivered by electrodes contracting the heart muscles, to regulate what?
{'answer': 'the beating of the heart', 'supporting_facts': [['Cardiac contractility modulation', 0], ['Cardiac contractility modulation', 3], ['Artificial cardiac pacemaker', 0]]}