Czym jest BOAS ?

BOAS (ang. Brachycephalic Airway Obstruction Syndrome) Brachycephalic airway obstruction syndrome (BAOS)* is characterized by primary and secondary upper respiratory tract abnormalities, which may result in significant upper airway obstruction. BAOS is an inherited condition in the cavalier King Charles spaniel. The breed is pre-disposed to it, due to the comparatively short length of the cavalier's head and a compressed upper jaw

The term "brachycephalic" or "brachiocephalic" means short-nosed and refers to dogs with short muzzles, noses, and mouths. "Brachy" means short and "cephalic" means head. The throat and breathing passages in brachycephalic dogs often are undersized or flattened. The head's soft tissues are not proportionate to the shortened nature of the skull, and the excess tissues tend to increase resistance to the flow of air through the upper airway (nostrils, sinuses, pharynx and larynx).

This developmental defect is somewhat more apparent in a few other breeds: the English bulldog, pug, Boston terrier, and Pekingese, in particular. However, various degrees of BAOS predominate in the CKCS. The primary BAOS abnormalities in the cavalier include an elongated and fleshy soft palate, narrowed nostrils (stenotic nares), and everted laryngeal saccules, all of which are discussed in detail here. Other disorders may include laryngeal malformation and relatively small windpipe (tracheal hypoplasia or stenosis) and collapsing trachea*, andepiglottic retroversion, which are not specifically covered in this article. All of these disorders cause obstruction of the upper airway, compromise the dog's ability to take in air, and may result in laryngeal collapse. BAOS in the CKCS has been attributed by some researchers as a consequence of the selection for soft, puppy-like facial features, referred to as "morphological neoteny".

Symptoms of BOAS 

The symptoms may vary and range in severity, depending upon which abnormality is causing them, but they typically include:

• labored and constant open mouthed breathing

• noisy breathing

• snuffling

• snorting

• excessive or loud snoring

• gagging

• retching

• sleep apnea

• exercise and/or heat intolerance

• general lack of energy

• pale or bluish tongue and gums due to a lack of oxygen