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.
Still, I'm shocked you're still doing twice weekly blood draws after six months. Most folks go down to once a month after they're stable for a while. I don't remember ... maybe you've had a struggle getting your INR stable?
Glad I decided to make the switch to home monitoring :)