My workers compensation claim was made in the State of: Colorado. During my Worker’s Comp. surgery to repair my left knee propofol was used It is subsequent heart block occurred. Months later a correction to the knee surgery led to another more severe heart block. One day postop I was in the emergency room hooked to the crash cart for hours. Had to have a pacemaker installed. Worker’s Comp. lawyers are denying correlation between the surgery in the heart block and subsequent pacemaker. Question, how do I show causation in this instance?