Can i use massager with pacemaker or defibrillator

You should really ask your doctor to be sure.

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Metal detector security screening appears safe for people with pacemakers or implantable cardioverter-defibrillators (ICDs), researchers found. Metal detector gates, which generate much stronger electromagnetic fields, also appeared safe for cardiac rhythm device patients in a prior study by the same research group.

This information should be in the instruction manual , If not get information from homemedic maker.

as the stove top works on a magnetic field that gets concentrated will metal appliances , it is possible that that magnetic will affect the pacemaker if near the stove
contact the manufacturer of the pacemaker direct or talk with the heart specialist for exacting advice

Yes you can, your pacemaker has to have a strong magnetic field to interfere with it.
Here is a list of devices and whether or not they will interfere with your pacemaker from the American Heart Association.

Devices that may Interfere with Pacemakers

Check the name of company on monitor and write them or use google search.

here is a link for the users manual in pdf. there is a troubleshooting section

http://www.ardusmedical.com/manuals/HP-M1722B-Codemaster-XL+Op-Manual.pdf

Boy is this posted in the wrong place. "If the pacemaker has one lead, it is known as a single chamber pacemaker. The lead can be placed in either the right atrium or the right ventricle. This type of device can be used only if the signal from the SA node or the AV node is the problem, and all other electrical conduction in the patient's heart is working correctly. Patients with this type of pacemaker can sometimes feel an uncomfortable neck throbbing, chest fullness or faintness when the device fires, known as pacemaker syndrome. Because of this problem, and the general ability to pump a greater volume of blood, some patients are treated with a dual chamber system."--BNET
http://findarticles.com/p/articles/mi_gGENH/is_20050229/ai_2699003575/