CARDIAC PACEMAKER. A cardiac pacemaker is an electric stimulator that produces electric pulses that are conducted to electrodes normally located within the lining of the heart (the endocardium ).
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It is the first type of pacemaker that was developed. A cardiac pacemaker that is free running. It gives a fixed heart rate.
It is used when a human’s heart can establish a normal cardiac rhythm between periods of block. This means that it is not necessary to stimulates the ventricles continuously.
There are two general forms of synchronous pacemakers: the demand pacemaker and the arial-synchronous pacemaker.
The demand-type pacemaker
The artial-synchronous pacemaker