Cardiac Patient Monitoring Jacket

The “Cardiac Patient Monitoring Jacket” is a jacket that is intended to help cardiac rehab nurses monitor patients. After a cardiac surgery, such as a bypass or a cardiac cath, most patients are required to participate in some form of cardiac rehab. Often times this requires the patient to participate in monitored rehab therapy in a hospital gym. After a heart procedure it is very important that the patient monitor their heart rate to ensure that they do not exceed the threshold set by their physician. During the monitored gym exercise it is not uncommon to see a number of patients exercising at the same time, therefore requiring one cardiac rehab nurse to monitor multiple patients. Typically the patients are connected to heart rate monitors that are watched by employees on a screen at the nursing station, and an audible alarm is set to each patient. The difficulty with this is that there is potential for the alarm to go unnoticed if the noise level in the gym is high due to multiple patients using the equipment. Imagine monitoring a video screen with twenty treadmills running simultaneously, and having to listen for an audible alarm while dealing with a patient at the desk. There is a potential for a patient’s overexertion to go unnoticed. Even the patient may overlook that they have exceeded their threshold. It is not difficult to imagine a patient who does not realize that they are above their target heart rate simply because they are used to working out at a much higher level before they had their procedure. The “Cardiac Rehab Patient Monitoring Jacket” is a means to supplement the monitoring processes already set in place, and provide additional levels of safety to monitored cardiac rehab exercise.

The jacket allows that each user can have their heart rate threshold programmed into the jacket based on their physician’s recommendation. A 50 year old patient, who was an avid runner pre-procedure, who had a single cardiac cath inserted will likely have a higher threshold than a 65 year old patient who had triple bypass and lived a largely sedentary lifestyle. The limits would be set according to the patients perceived fitness level, and the suggested limitations of physical activity. The patient will wear a wireless chest-strap heart rate monitor which is interfaced with the jacket. Once the heart rate limit is exceeded the 64 LED matrix will light up to signal that the patient needs to slow down and lower their heart rate. This not only allows for the cardiac rehab employee to monitor the patient, but will also signal the patient and other patients to the situation. If the employee was distracted by another patient, or failed to hear the audible alarm, then hopefully the patient would be made aware of their overexertion, or perhaps another patient who is in the gym.

The jacket is powered by two battery packs that use 4 AA batteries, and have on and off switches. The heart rate monitor interface (HRMI) is connected to an Arduino Uno, and the Arduino is connected to the Adafruit NeoPixel NeoMatrix 8×8. The program that runs they system allows that the heart rate threshold can be changed in the first few lines of the code to fit the designated parameters of each individual patient. The pixel matrix is activated once the heart rate threshold is exceeded, and will automatically turn off once the heart rate returns to normal. Taking into consideration that most cardiac patients are older, the simplicity of the jacket is a key factor in the success of its implementation. The cardiac rehab employee will program each Arduino based on consultation with the patient’s cardiologist, and each jacket will be assigned to one patient. As the patient recovers, the values of the threshold can be changed according to their physician’s recommendations. This will also allow that the patient has a simple means of self evaluation. A patient who is unfamiliar with using heart rate monitors can be easily taught that if their jacket lights up, they need to back off on their workout. This will help the patient in understanding their personal limits, and provide a simple means of monitoring how their fitness level was affected by their procedure.

The use of wearable technology in healthcare is not a new idea, and there are many products that incorporate vital signs in their products, but for these products to truly be effective, they must be simple enough for a patient with no clinical or technological background to use and understand. There are existing garments such as the Heart Sensing Sports Bra, the Heart Sensing Racer Tank, and the Cardio Shirt for Men, but the impressive capabilities of these garments can also be considered a hindrance. These products often require additional software applications, and are designed for athletes and fitness enthusiasts. In some cases their technological capabilities can be a deterrent to users who are not tech savvy. It can be intimidating for a user to not only be required to monitor their vital signs, but to also have to learn new technology. Products like the Adidas micoach provide a variety of functions that could serve the same purposes as this project, but in the case of many patients, the additional time required to learn to use the product (and the added cost) would be one more stress factor that could be avoided with a more simple product that is focused on one key function. These products are also designed to provide the user with information that is used for fitness tracking and monitoring with no way to alert others that the user is in trouble. The simplicity of this project could be seen as a benefit to the patient and anyone in the general vicinity of the patient. Future versions of the project could include features that would allow for the jacket to be used outside of a hospital setting. Because the entire project operates independently of any hospital equipment, the patient could also use it during their daily life. After the patient has completed their required rehab schedule they could benefit from the reassurance that they could continue using the device. If an additional alarm was included in the project, it could be used as a means of alerting someone who is unfamiliar with the project that something is wrong. For example, a patient who has recently completed her monitored exercises takes daily walks in her neighborhood. During one particularly hot day, she begins to feel fatigued and exceeds her preset threshold. The device is activated, and the LED matrix lights up and an alarm sounds. This could alert anyone passing by that the woman is in need of help. Whether the person passing by is familiar with the product or not, it would be clear that something was wrong, and it would be likely that they would notice the alarm and lights, and hopefully that the woman was in distress.

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