What makes a pacemaker ineffective?
Patient: Why would my dads pace maker go off after he just 3 months ago had a triple bypass and was in hospital till Feb 14 th had his surgery on December 22 just this week went back to work but is only working half days and just got off and undressed then it hit him on way to sit down Doctor: Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.  I would like to tell you that pacemaker doesn't work in high pacing threshold setting which is very uncommon.   Pacing threshold can increase on its own if there is an electrolyte imbalance, hypoglycemia, hypothyroidism or acid-base disorder has developed in the body. To avoid these complications your father needs to be very regular with meals, diet, medicines, blood test and personal physician consultations.  He will also require pacemaker calibrations on very six months or as per his physician decides.  Hopefully this information will answer your query.