Posted: 09/27/2010 - Imagine, one minute you're fine. The next, your arms, legs, even throat, swell up so large, your airway could be blocked. If not treated, you could die. It's something that happens to up to 15,000 people each year. Doctors have been working on a cure for 50 years, and now, researchers may have found three new ways to give these patients some relief.