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By what other names are lung perfusion scans and lung ventilation scans referred?
GaleEncyofMedicine
perfusion lung scan, aerosol lung scan, radionucleotide ventilation lung scan, ventilation lung scan, xenon lung scan, ventilation/perfusion scanning (VPS), pulmonary scintiphotography, or, most commonly, V/Q scan
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What precautions must be observed in lung perfusion scans and lung ventilation scans?
if the patient has had other recent radio-nuclear tests, it may be necessary to wait until other radiopharmaceuticals have been cleared from the body so that they do not interfere with these tests.
What is a lung perfusion scan?
DefinitionA pulmonary ventilation/perfusion scan involves two nuclear scan tests. These tests use inhaled and injected radioactive material (radioisotopes) to measure breathing (ventilation) and circulation (perfusion) in all areas of the lungs.Alternative NamesV/Q scan; Ventilation/perfusion scan; Lung ventilation/perfusion scanHow the test is performedA pulmonary ventilation/perfusion scan is actually two tests. These tests may be performed separately or together.During the perfusion scan, a health care provider injects radioactive albumin into your vein. You are placed on a movable table that is under the arm of a scanner. The machine scans your lungs as blood flows through them to find the location of the radioactive particles.During the ventilation scan, you breathe in radioactive gas through a mask while you are sitting or lying on a table under the scanner arm.How to prepare for the testYou do not need to stop eating (fast), eat a special diet, or take any medications before the test.A chest x-ray is usually done before or after a ventilation and perfusion scan.You will sign a consent form and wear a hospital gown or comfortable clothing that does not have metal fasteners.How the test will feelThe table may feel hard or cold. You may feel a sharp prick while the material is injected into the vein for the perfusion part of the scan.The mask used during the ventilation scan may make you feel nervous about being in a small space (claustrophobia). You must lie still during the scan.The radioisotopeinjection usually does not cause discomfort.Why the test is performedThe ventilation scan is used to see how well air and blood flow moves through the lungs. The perfusion scan measures the blood supply through the lungs.A ventilation and perfusion scan is most often done to detect a pulmonary embolus(blood clot in the lungs). It is also used to:Detect abnormal circulation (shunts) in the blood vessels of the lungs (pulmonary vessels)Test lung function in people with advanced pulmonary disease, such as COPDNormal ValuesThe health care provider should take a ventilation and perfusion scan and then evaluate it with a chest x-ray. All parts of both lungs should take up the radioisotope evenly.What abnormal results meanIf the lungs take up lower than normal amounts of radioisotope during a ventilation or perfusion scan, it may be due to:Airway obstructionChronic obstructive pulmonary disease (COPD)PneumoniaNarrowing of the pulmonary arteryPneumonitisPulmonary embolusReduced breathing and ventilation abilityWhat the risks areRisks are about the same as for x-rays (radiation) and needle pricks.No radiation is released from the scanner. Instead, it detects radiation and converts it into an image.There is a small exposure to radiation from the radioisotope. The radioisotopes used during scans are short-lived. All of the radiation leaves the body in a few days. However, as with any radiation exposure, caution is advised for pregnant or breast-feeding women.There is a slight risk for infection or bleeding at the site where the needle is inserted. The risk with perfusion scan is the same as with inserting an intravenous needle for any other purpose.In rare cases, a person may develop an allergy to the radioisotope. This may include a serious anaphylactic reaction.Special considerationsA pulmonary ventilation and perfusion scan may be a lower-risk alternative to pulmonary angiography for evaluating disorders of the lung blood supply.This test may not provide an definite diagnosis, especially in people with lung disease. Other tests may be needed to confirm or rule out the findings of a pulmonary ventilation and perfusion scan.ReferencesTapson VF. Pulmonary embolism. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier; 2007:chap 99.Reviewed ByReview Date: 09/15/2010David C. Dugdale, III, MD, Professor of Medicine, Division of General Medicine, Department of Medicine, University of Washington School of Medicine; Denis Hadjiliadis, MD, Assistant Professor of Medicine, Division of Pulmonary, Allergy and Critical Care, University of Pennsylvania, Philadelphia, PA. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.
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