LUNG VENTILATION/PERFUSION SCAN
Ventilation is investigated with Tc99m TECHNEGAS and is followed with Tc99m - MAA perfusion scan. Optional: quantitative perfusion and ventilation assessment before lung surgery.
Indications
Suspected pulmonary embolism. Assessment of lung function before volume reduction surgery, and in malignancies before surgery or radiotherapy.
Contraindication
Pulmonary oedema / Severe Pulmonary Hypertension.
Preparation
Chest X-ray.
For a ventilation scan the patient has to be co-operative and be able to breath through the apparatus. (Difficult to perform in cases with severe SOB).
Vent Study: Normal vent in R Lung, defect in L base.
Perf Study: Mismaching perf defect in R base suggesting PE. Matching defect in L base.