## 2 Related Work
Other devices allow data to be downloaded and viewed by third parties such as healthcare managers or clinicians watching for alarming trends that call for medical intervention. Hospital patients are often tethered to various monitors, pumps, and medical gear. A brief review of commercial devices is presented here. The IntelliVue MX40 from Philips Electronics attempts to simplify patient monitoring by integrating telemetry into a compact wearable patient monitor that can be used to monitor ambulatory patients and patients during transport. The device helps to save nurses' time because it allows them to check their patients' ECG rhythms without calling a technician at a central monitoring station. Numera is developing a soon-to-be-released wearable mobile device that will provide two-way hands-free voice communication through a cellular network, GPS location tracking, and automated fall detection algorithms for personal emergency response services (PERS). Numera devices will also be equipped with telehealth gateway technology, allowing patients to upload biometric measurements from a variety of health devices through the mobile personal health gateway, to receive personalized reminders to take medications, to upload measurements, and to receive coaching specific to their health conditions. Zephyr Technology's BioHarness BT sensor technology is used by third-party manufacturers of wearable fitness gear to add biometric monitoring capabilities. An example of this technology is under Armour's E39 electronic compression garment, which tracks data such as the wearer's breathing and heart rate. The data can be transmitted to a computer or mobile device. Other measures that the BioHarness BT can monitor are blood oxygen, ECG, and blood pressure. The device can also connect to a smartphone to transmit data to the Zephyr portal. From there, the data can be pushed to the user's personal electronic health record or to dispatch and service center applications on the World Wide Web. The Nike FuelBand, a fitness monitoring wristband, measures and displays four metrics: time, calories, steps, and \"NikeFuel,\" a metric that measures the user's physical activity. NikeFuel is a proprietary technology that measures activity through the movement of the user's wrist and uses algorithms based on oxygen kinetics. Unlike calorie counts, which vary based on gender and body type, NikeFuel is \"a normalized score that awards all participants equal scoring for the same activity regardless of their physical makeup\". Nike FuelBand users can also choose to receive a calorie count to compare how many calories have been burned with how much NikeFuel has been earned. The main disadvantage of these devices is their price. Another disadvantage is that generally, these commercial products do not provide open source for development. Additionally, although there are applications of wireless biomedical monitoring systems, the literature review exposes some areas of opportunity that have not been explored at all, such as the integration of _ad hoc_ wireless networks, the development of applications for mobile devices (_i.e._, smartphones), the use of augmented reality and the performance of analyses for basic diagnostics. The SMTRPM exploits these opportunity areas in the design of a new open alternative for real-time remote patient monitoring.