6.4
Radiological Investigation II: MRI and Ventilation Perfusion Scan
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Q1: What imaging technology does MRI use to diagnose lung conditions?
MRI uses magnetic fields and radiofrequency signals to distinguish between normal and abnormal lung tissues, providing detailed diagnostic images. This technology helps characterize pulmonary nodules, stage bronchogenic carcinoma, and evaluate inflammatory activity in interstitial lung disease and acute pulmonary embolism.
Q2: What safety precautions should nurses take before an MRI scan?
Nurses must instruct patients to remove all metallic items, including hearing aids and hair clips, and assess for implanted metal devices such as aneurysm clips or cardiac devices. Nurses should also check for metallic tattoo ink and inform patients of potential MRI-related burns, applying cold packs as necessary for safety.
Q3: How does a V/Q scan assess lung function?
A V/Q scan involves injecting a radioactive agent into a peripheral vein and having the patient inhale radioactive gas. The isotope particles distribute proportionally to regional blood flow, allowing nurses to trace and measure blood perfusion through the lungs and evaluate gas exchange and pulmonary vascular supply.
Q4: What conditions can V/Q scans help diagnose?
V/Q scans diagnose bronchitis, asthma, inflammatory fibrosis, pneumonia, emphysema, and lung cancer by measuring the integrity of pulmonary vessels and evaluating blood flow abnormalities. They assess normal lung functioning and detect perfusion defects associated with pulmonary embolism and other vascular conditions.
Q5: What are the pre-procedure nursing responsibilities for a V/Q scan?
Before a V/Q scan, nurses must establish intravenous access for radioactive agent injection and ensure a chest x-ray is performed. These preparatory steps allow nurses to assess baseline lung status and ensure proper vascular access for the procedure.
Q6: How should nurses care for patients after a V/Q scan?
Post-procedure, nurses should encourage increased fluid intake to facilitate elimination of radioisotopes through urine. This nursing intervention helps clear radioactive material from the patient's body and reduces radiation exposure following the diagnostic procedure.
Q7: How long does an MRI scan typically take and what should patients expect?
Patients must lie flat and remain still for 30 to 90 minutes while the table moves into a large tubular magnet. Nurses should inform patients about this duration and immobility requirement to reduce anxiety and ensure cooperation during the magnetic resonance imaging procedure.