What is thachy_brady syndrome?is it the cause of pacemaker implantation by the kind of pacemaker used? single or dual chamber.thank you

Fast and slow!: Tachy-brady means sometimes the heart goes too fast and other times too slow. We need a pacemaker to prevent the slow beats so we can more safely give medication to control the fast beats. The type of pacemaker depends on what type of rhythms are involved. Usually it's dual chamber unless someone is in atrial fibrillation all the time.