ULTRASOUND AS DIAGNOSTIC TOOL IN LARYNGEAL PARALYSIS OF DOGS
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Naturally occuring laryngeal paralysis is more and more diagnosed in dogs over the last couple years. Unfortunately, the diagnosis is not always easy to make and many anesthetics produce either false-positive or false-negative results if laryngoscopy if performed. Is ultrasound, a quick and non-invasive diagnostic method, helpful to detect patients which do not show clinical signs?
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Forty dogs with clinical signs suggestive of upper respiratory tract disease underwent echolaryngography and laryngoscopy.
Laryngoscopy was used as the definitive technique to diagnose laryngeal paralysis.
The ultrasound investigation accurately indicated the presence of the paralysis and confirmed the uni- or bilateral nature of the disorder.
Findings indicative of laryngeal paralysis included asymmetry or absence of motion of the cuneiform processes (30/30), abnormal arytenoid movement (16/30), paradoxical movement (9/30), caudal displacement of the larynx (2/30) and laryngeal collapse (1/30).
Thirty dogs were found to be afflicted with laryngeal paralysis and ten had normal laryngeal motility.
Source: Rudorf H, Barr FJ, Lane JG (2001): The role of ultrasound in the assessment of laryngeal paralysis in the dog. In: Vet Radiol Ultrasound. 2001 Jul-Aug;42(4):338-43.
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