High potassium causes numerous problems for renal patients from slow pulse, tingling and burning sensations, sickness and weakness to heart failure. Our worst experience was in a pub in Cambridge when the hospital hadn't picked up on OH's high level that week. He became paralysed and I had to hoick him over my shoulder, put him in the car and whizz off to a hospital....seems he was lucky that it stopped his legs working because the levels he had usually stopped the heart...Nearly spoiled a Joan Baez concert. ;-) x