The market for hospital wireless monitoring systems has more than doubled in the past five years, from $1.7 billion in 2006 to $4.4 billion in 2010, according to the latest research from Kalorama Information. The main reason for the increase: New studies downplaying the risk of possible interference between wireless monitoring systems and other electronics, as well as new protections created by wireless vendors like BlueTooth and Zigbee have led hospitals to relax their policy restrictions on wireless monitoring within their own walls, according to an article published at CMIO. Kalorama did indicate the issue of interference isn't completely settled yet, however, and vendors have some work to do to eliminate the threat entirely. For example, wireless systems that run on the 2.4 or 5 GHz band can cause interference with each other, as some wireless phone systems and Wi-Fi routers use those same frequencies. Article