my friend had a pacemaker fitted just over a year ago and is awaiting a transplant, all has been well since, however yesterday he seemed bloated, out of breath and had a significant slur, he is in his early 40 s, he mentioned he had been for a check up and they had tweaked about with his pacemaker, he has never been over weight and always healthy. Concerned about this can you help/explain this turn of events please