question: My father, He is 81 and was active broke his leg 84 days ago did surgery then colon started bleeding repaired that, had surgery went into renal failure.Then had gall bladder surgery and also receives dialysis 3 times a week and was on a vent for 4 days after. Its been 2 weeks and when he speaks you can barley hear him. He also mumbles allot and get frustrated. Test show no stroke. What could b cause this. Almost no vocalization in past 2 days.