Implantable device is called the Guardian

Considerable research is being put into monitoring and predicting certain medical conditions and diseases that can lead to death. Statistics show that 30% of the 1 million people that have a heart attacks each year die before they seek medical attention. The average time for a person to seek medical attention when having a heart attack is about three hours.
Medical researchers have developed a new implantable warning device called the Guardian that uses vibrotactile alarms to warn the user of an impending heart attack. The device is designed to vibrate when it senses the onset of a heart attack or an issue that requires a doctor's visit. The device will also issue audible and visual warnings as well.
Studies have found that many elderly users can't hear audible alarms, and poor eyesight may prevent them from seeing visual arts. 
“A vibrotactile alarm provided by the implanted device has two major advantages,” says Mary Carol Day. “First, the implanted device can’t be left behind like a portable device. Second, a vibrotactile alarm from the implanted device is more likely to be felt than an auditory alarm is to be heard because, for example, the patient may be wearing heavy clothing, has hearing loss, or is in a noisy environment.” 
This implantable warning device is envisioned with two different alarms. One alarm would warn the person that they could be having a heart attack and dial 911 immediately, while another would indicate the condition that needs to be seen by a physician within the next 48 hours.

This implanted monitoring device would be about the size of a pacemaker that would be placed in the upper left chest area and paired with an external device that similar to pager that would give an audible and visual alarm as well.
A study of vibrating alarms for the elderly has shown that the study participants can tell the difference between vibrating alarms for low and high priority issues. The participants in that study also liked the combination of vibrating alarms along with visual and auditory warnings.
“If the Guardian is approved for sale by the FDA,” continues Day, “it might be extended in ways that will change the way the patient interacts with the system as a whole. This would require more research and simulated-use studies to refine and validate the new interactions between the patient and the system.” 

Source: HFES

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