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1 From the Department of Radiology, University of Tennessee, College of Medicine, Memphis, Tennessee
1. Animal studies were conducted to study the coating effect of contrast materials by inhalation on the trachea and bronchi.
2. Negative results were obtained with barium sulfate powder, dionosil oily, lipiodol, visciodol, iothalamates and diatrizoates.
3. Nebulization with intermittent positive pressure breathing apparatus was unsatisfactory.
4. Excellent animal bronchograms were obtained by inhalation of an aerosoled barium sulfate, methylcellulose and saline mixture. No harmful effects were observed from this procedure.
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