Pulmonary Embolism Support Group
By far the most common form of pulmonary embolism is a thromboembolism, which occurs when a blood clot, generally a venous thrombus, becomes dislodged from its site of formation and embolizes to the arterial blood supply of one of the lungs. Symptoms may include difficulty breathing, pain during breathing, and more rarely circulatory instability and death.

I guess that should make those of us still here feel fortunate.
http://www.cnn.com/2013/07/09/showbiz/placido-domingo-hospitalized
I consider myself very lucky, because I have COPD & CHF and both present with symptoms of SOB. I went to the ER with SOB and they diagnosed me wit PE.
They couldn't do a CT scan because my renal blood tests were elevated, so they did another test (can't remember the name of the test. I think it was a lung scan, but it's not as accurate as a CT scan). I have been on Xarelto since.
However, my Pulmonolgist didn't think I had PE. I'll know for sure when I have a CT scan if my renal numbers are OK.