Hello, My mother in law, 87 years old, had a pacemaker installed on Wed. A few days ago. Today her left hand is swollen, the back of her arm to the elbow has been painful for the last 3 days. She has been walking the past 3 days 3/4 to 1 mile with a couple hills, this is her standard regimen. Is the swelling and back of arm pain normal? Thank you, Mike