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.
http://www.medscape.com/viewarticle/761534?sssdmh=dm1.773506&src=nldne
"Medical Societies List 45 Dubious Tests, Therapies"
"The remaining ACP admonitions are as follows:
Do not order a stress test for asymptomatic patients who are at low risk for coronary heart disease.
Do not obtain imaging studies in patients with nonspecific low back pain.
Do not order imaging studies as an initial test for patients with low pretest probability of venous thromboembolism; instead, first obtain a high-sensitive D-dimer measurement.
Do not obtain a preoperative chest X-ray when lacking any clinical suspicion for intrathoracic pathology."