My 82 yr old mother had heart attack 15 yrs ago, leaving 30% function and defibrillator for arrythmia. Diagnosed 2 yrs ago with Lewey body dementia, lives with me. Recently a drop in health level, i.e. more confused, weight loss, sitting pulse of 52 (B/P is perfect 120/68), sleeping 12 hrs. daily, irritable. Is there a medical condition or just her body starting to give out on her?