My sister has pain and numbness in rt arm, she has a pacemaker, she had surgery for a chiari malformation and still experiences pain, has had amny tests and she is giving up hope.  Her Mom had polio as a child.  Could the pace maker leads cause the pain, numbness and burning in her arm that is progressing.
Tithe permanent insertion of the pacemaker is a small surgical procedure requiring incision then resuturingDuring which many nerve endings get involved. This keep on firing pain, irritation on and off,, with the area supplied by the nerve showing pain and numbness to worry. Local application of pain relieving gel will help a lot. Take care