why do some people have to have a pacemaker inserted?

Answer 1

because their heart is not working correctly (or in rythym) so the pacemaker helps the heart keep beating correctly.

Without it they risk dying due to heart malfuction.

Answer 2

The heart is "autogenic" or self-starting, because it fires action potentials without any signals from the nervous system or anything else. This can only be accomplished by some specialized cells (in areas called the Sino-Artial, or Atrio-Ventricular Nodes). The action potentials then spread to all the other heart cells. The action potentials cause the contraction of the heart muscle.

However, in some people, the cells (in the SA or AV nodwes) that start the action potentials do not fire fast enough, or there is some problem with the action potential spreading to all the other heart cells. It is these people who would need an artificial pacemaker.

Answer 3

Your heart is autogenic meaning it makes it's on beat but is effected by your SNS and PNS via chemicals. Your heart should make two sounds, "lubb" (closing of the atrial valves) and "dubb" (closing of the semilunar valves). A third beat can be heard or seen on a ECG when your younger rarely.

Your SA node is your actual built in Pacemaker. If you have a adnormal heart beat, your SA Node might be damage causing a premature beat or late beat. If you know how to read a ECG, you should see it before the P wave or after your T wave. But it can effect any wave including P,Q,R,S, T.

Pacemakers are inserted to send an electrical charge to the heart telling it when to fire correctly basically. Which in turn allows your heart to fill with blood correctly and pump it out correctly

There could be a number of reasons to have a pacemaker inserted. It could be your SA Node, AV node is slowing it down to much or processing to quickly, bundle of his are screwed up, or your purkinje fibers aren't firing correctly and so on....

Answer 4

When SA node is destroyed by Ischemia or Atherosclerosis heart can not start its impulse normally and and an ectopic rhythm sets in which can be life threatening. An electronic artificial SA node called Pace maker restores normal rhythm.