9 - Lung Ventilation-Perfusion Scan

9 - Lung Ventilation-Perfusion Scan - ‫‪Lung...

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Unformatted text preview: ‫‪Lung Ventilation-Perfusion‬‬ ‫)‪Scan (V/Q Scan‬‬ ‫‪Scan‬‬ ‫الدكتور قصي المقبل‬ ‫أستاذ مشارك- قسم الشعة والطب‬ ‫النووي‬ ‫كلية الطب-جامعة العلوم والتكنولوجيا‬ ‫الردنية‬ Pulmonary Embolism Pulmonary The main application of this procedure is The in pulmonary embolism investigation. in Pulmonary embolism usually causes Pulmonary perfusion defects, which usually occur in more than one segment. more Technique Technique Perfusion scan is usually correlated with Perfusion ventilation scan. ventilation If perfusion scan is normal, ventilation If scan can be skipped. scan If there are segmental perfusion defects, If then ventilation scan is needed. then Normal Perfusion Images Images Normal Ventilation Scan Normal Ventilation/Perfusion Ventilation/Perfusion Types of Perfusion Defects Types Mismatched Perfusion defects: -Ventilation is normal in that segment -Ventilation -Indicative of PE. -Indicative Matched Perfusion defects: -Ventilation defect in that segment. -Ventilation -It is usually seen in parenchymal lung disease. disease. RESULTS RESULTS Normal perfusion scan: means that the patient is very unlikely to have acute PE. have Low probability V/Q scan: Low means that the patient has less than 20% probability of having acute PE. probability RESULTS-Cont.. RESULTS-Cont.. High probability V/Q scan: means that the patient has greater than 80% probability of having acute PE. 80% Intermediate probability V/Q scan: means that the patient has between 20 – 80% probabilities of having acute PE. 80% High Probability for PE High Problem Problem Intermediate probability is a frequent Intermediate finding in V/Q scans and creates a problem for the clinician due to its wide range of probability. range CT-scan has replaced this test due to its CT-scan high sensitivity and specificity for acute PE which reaches about 90%. which However.. However.. However, V/Q scan is still indicated in However, patients with underlying renal impairment. patients Iodinated contrast given during CTIodinated scanning can deteriorate renal function in scanning those patients. those ...
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