Pacemaker and Potassium

Pacemaker and Potassium   Heart pace maker is recommended for a person when his pulse rate goes down.   The company which manufactures the pace makers say on their web site that pace maker has no utility.   My mother has been recommended the pace maker More then 6 times by hospitals in last 10 years.   My mother is diabetic for last 40 years.   Her pulse goes down when her potassium goes...