My mother had heart surgery and has an internal pacemaker and defibrillator device, can she use the mat for heating or magnetic therapy?

FIR mats heat the body inside and should not be used by patients with pacemakers unless directed by a cardiologist.

Of course, she can use the mat for negative ions only (non-heating, non-powered mode).

Though, in general, infrared heating pads have not been shown to interfere with or damage pacemakers/defibrillators, there may be a slight chance of causing interference occasionally. 

It is considered a contraindication, and anyone who uses an internal pacemaker and/or defibrillator should consult a physician/health professional before using the mat in heating mode.

We recommend anyone who uses a pacemaker and/or defibrillator to use the mat on low heat only (up to 95F-113°F or 35-45°C) or for negative ion therapy in an unpowered mode not to use the PEMF (pulsed electromagnetic field) function at all.

The use of the FIR amethyst mat even on the lowest levels increases circulation, which can cause an increase in heart rate. Some people who use a pacemaker experience discomfort since their heartbeat is being controlled. If you experience continued discomfort, discontinue use immediately and seek medical attention. 

Anyone with a defibrillator should make sure not to lay on the mat directly over the device.

Remember that it is your responsibility to seek a health care professional's attention before and during the use of this device. It is not marketed as a medical device, nor is it claimed to heal or cure any sickness.

In the case of defibrillators and pacemakers, it may also be necessary to consult those devices’ manufacturers.