Inject radioactive. A perfusion lung scan is done by injectecting a low-dose radioactive tracer into a vein and taking images showing where blood flow is going in the lungs. It is used to diagnose pulmonary embolism (blood clot to the lungs). The test is safe and generally free of any side effects. It is used less often now than ct angiogram, but is safer and involves less radiation exposure.
The V/Q Scan. The pulmonary v/q scan is primarily used to evaluate for pulmonary embolism. This involves imaging blood perfusion to the lungs as well as ventilation to the lungs.
Ventilation Scans... A ventilation/perfusion scan (or vq) is a way to look at both airflow and blood flow to the lungs. Abnormal blood flow can occur when there is a clot present (ie pulmonary embolism). Abnormal ventilation can occur when airflow is affected by a blocked airway (ie from cancer) or because of destroyed air sacs/alveoli (like in emphysema). A radiologist typically will "read" a VQ scan.
V/Q mismatch. "ventilation - perfusion mismatch consistent with a high risk of pulmonary embolism.".
Usually none. The dose of radioactivity given is small, and the test is considered safe and harmless. If a woman is pregnant, the use of any radioactive material must be carefully weighed as to potential benefits vs risks to the fetus.
Usually nothing. Side effects are very rare if the scan is performed properly. There is a minimal amount of radiation involved. An IV is required. In rare cases a person may have an allergy to the tracer. See: http://sgoti. Ws/rpnyr8.