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Concept
Brachycephalic airway obstructive syndrome
Summary
Brachycephalic airway obstructive syndrome (BAOS) is a pathological condition affecting short nosed dogs and cats which can lead to severe respiratory distress. There are four different anatomical abnormalities that contribute to the disease, all of which occur more commonly in brachycephalic breeds: an elongated soft palate, stenotic nares, a hypoplastic trachea, and everted laryngeal saccules (a condition which occurs secondary to the other abnormalities). Because all of these components make it more difficult to breathe in situations of exercise, stress, or heat, an animal with these abnormalities may be unable to take deep or fast enough breaths to blow off carbon dioxide. This leads to distress and further increases respiratory rate and heart rate, creating a vicious cycle that can quickly lead to a life-threatening situation.
Brachycephalic dogs have a higher risk of dying during air travel and many commercial airlines refuse to transport them.
Dogs experiencing a crisis situation due to brachycephalic syndrome typically benefit from oxygen, cool temperatures, sedatives, and in some cases more advanced medical intervention, including intubation.
BAOS is also referred to as Brachycephalic Airway Syndrome (BAS), Brachycephalic Syndrome (BS), and in the UK as Brachycephalic Obstructive Airway Syndrome (BOAS).
The primary anatomic components of BAOS include stenotic nares (pinched or narrowed nostrils), and elongated soft palate, tracheal hypoplasia (reduced trachea size), and nasopharyngeal turbinates.
Other risk factors for BAOS include a lower craniofacial ratio (shorter muzzle in comparison to the overall head length), a higher neck girth, a higher body condition score, and neuter status.
Recent studies led by the Roslin Institute at the University of Edinburgh's Royal School of Veterinary Studies has found that a DNA mutation in a gene called ADAMTS3 that is not dependent on skull shape is linked to upper airway syndrome in Norwich Terriers and is also common in French and English bulldogs.
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