This is Dr. David
as we get older, our skin and soft tissues can sag and not be as strong
a pacemaker is usually placed in the upper chest subcutaneous tissues
but if your muscle mass is low and your tissue and collagen becomes less strong, the pacemaker can sag and sometimes it can end up in your arm pit area.
as long as the leads of the pacemaker are still going to the heart and the unit is not bothering you too much, it can remain where it is.
if it is uncomfortable and causing problems, your doctors can do a surgery to try to re-position it
let me know if you have other questions.
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