Approximately 99% successful.
In fixed mode, a pacemaker delivers electrical impulses at a set rate regardless of the patient's intrinsic heart rate. If the intrinsic heart rate is lower than the pacemaker's set rate, the pacemaker will override it and maintain the fixed rate. However, if the intrinsic rate exceeds the pacemaker rate, the pacemaker will not increase its output; it simply provides support when the intrinsic rate is insufficient. Thus, the pacemaker rate does not add to the intrinsic rate in fixed mode.
An Artificial Pacemaker basically regulates the rate of the heart beat depending on the needs of the body.
Pacemaker
Pacemakers are set by the surgeon-physician at the time it is implanted. Most times, the pacemaker is simply set to a normal heart rate (around 70-80 beats per minute). The primary function of the pacemaker is to restore a more regular beat when the heart cannot maintain a normal heart rate. You should consult your physician-surgeon for particulars about your pacemaker, its use, function, and signs/symptoms to watch for after the pacemaker is implanted.
A bypass merely clears the flow in the arteries, the pacemaker keep the heart beating at a steady rate.
A pacemaker is a device inserted into the heart to regulate the heart beats or heart rate
Oxygen needs
The property of the normal pacemaker region is able to provide a normal setting for the heart to beat. It allows the heart to beat at a regular rate.
would decrease the heart rate, because the pacemaker cells would generate fewer action potentials per minute
Pacemaker help to normalize the electrical impulses conductance of the heart. usually people with pacemaker has an abnormal impulse originated from their SA node. so, the pacemaker is placed so that the heart can contract at a normal rate and thus prevent arrhythmia.
Calcium has no effect on heart rate. It does, however, have an effect on how hard the heart squeezes (inotropic effect). Heart rate is effected by the slow sodium channels in the pacemaker cells in the right atrium (and other pacemaker cells if the SA node is malfunctioning).
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.