Answer
External means on the outside. Implanted means that the pacemaker goes inside the body.
The first pacemaker with plutonium 238 was implanted in Paris (France) in 1970, as a collaboration between Medtronic (USA) and Alcatel (France).
A fixed-rate pacemaker sends electrical prompts to your heart at an unchanging rate. Its drawbacks include that it is somewhat difficult to adapt to a state of physical exertion or emotional arousal.A more advanced type, called a demand pacemaker (there are several types) kicks in after your cardiac function varies outside a pre-set normal rate. It then brings your heartbeat into a more efficient rhythm. (Sinus-rhythm.)A demand pacemaker does not take the place of an implanted defibrillator! If a lifethreatening cardiac arrhythmia develops, it takes a defibrillator -- an implanted one or an external unit used by someone trained to respond -- to correct ventricular fibrillation. If it is not corrected, v-fib is fatal.Demand pacemakes are used to restore a normal heart rate that only becomes abnormal occasionally. A fixed rate pacemaker is used when the problem is always there and the heart won't keep going without constant help.
A fixed-rate pacemaker sends electrical prompts to your heart at an unchanging rate. Its drawbacks include that it is somewhat difficult to adapt to a state of physical exertion or emotional arousal.A more advanced type, called a demand pacemaker (there are several types) kicks in after your cardiac function varies outside a pre-set normal rate. It then brings your heartbeat into a more efficient rhythm. (Sinus-rhythm.)A demand pacemaker does not take the place of an implanted defibrillator! If a lifethreatening cardiac arrhythmia develops, it takes a defibrillator -- an implanted one or an external unit used by someone trained to respond -- to correct ventricular fibrillation. If it is not corrected, v-fib is fatal.Demand pacemakes are used to restore a normal heart rate that only becomes abnormal occasionally. A fixed rate pacemaker is used when the problem is always there and the heart won't keep going without constant help.
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