Diagnostic Ultrasonography of Experimentally-Induced Acute Pneumonia in Calves.
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Acute pneumonia was induced in three Holstein calves by intramuscular injections of corticosteroid, intratracheal nebulization of 8% acetic acid and intratracheal inoculation of <I>Pasteurella haemolytica</I>. Animals were examined for physical conditions, blood cytology and chemistry and X-ray. Ultrasonography (USG) was conducted from the 2 nd to 9 th intercostal spaces of the both sides using real-time B-mode linear scanners with 3.5 and 5.0 MHz transducers. At necropsy, the lung was scanned with a probe directly placed on the organ surface, and USG was also applied to excised lung samples, being soaked in a tank filled with air-freewater. The clinical and postmortem ultrasonograms and gross and microscopic pathology were comparatively studied. USG revealed an air echo pattern at the first stage of pneumonia followed by three types of changes with time; 1) Transfer of the air echo area to a low-level echo, 2) extension or no extention of the area, and 3) reduction or disappearance of the area. USG was suggested to be applicable to the diagnosis of acute pneumonia. Key words: acute pneumonia, air echo, calf, low-level echo, ultrasonography.
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公益社団法人 日本獣医師会 | 論文
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