Programmable cardiac pacemaker with microprocessor control of pacer rate

摘要: A programmable pacemaker apparatus having a microprocessor and means for receiving program information from an external source, generating delivering stimulus signals sensing the occurrence of natural heartbeats in patient, battery source powering apparatus, said being combined with instructions stored memory controlling operation pacemaker, comprising controller circuit to interconnected therewith operating state microprocessor, determining given events. The further comprises stopping on command starting upon determination one events, whereby normally is less than about 25% time. provides at least two modes pacing rate control, patient's heartbeat can be overdriven, or abrupt changes are not followed beyond selected change limit. Means provided control testing conditions, limiting current output when voltage drops below predetermined value.