Brachycephalic airway obstructive syndrome

Brachycephalic Airway Obstructive Syndrome (BAOS) is a pathological condition primarily affecting brachycephalic dogs, which are breeds with characteristically short noses and flat faces, such as the Pug, English Bulldog, and French Bulldog. This syndrome is also seen in some cat breeds, such as the Persian cat. The condition is a result of the unique anatomical features of these breeds, leading to a range of respiratory and other health issues.

Causes and Pathophysiology

Brachycephalic Airway Obstructive Syndrome is caused by the physical characteristics inherent to brachycephalic breeds. These include a shortened skull bone, which leads to a compacted upper respiratory system. The primary anatomical abnormalities contributing to BAOS include Stenotic Nares (narrowed nostrils), elongated soft palate, Everted Laryngeal Saccules, and Tracheal Collapse. These abnormalities can obstruct the airway, making breathing difficult and leading to increased effort to inhale air.

Symptoms

The symptoms of BAOS can vary in severity but typically include:

• Noisy or labored breathing
• Snoring, even when awake
• Frequent panting
• Coughing or gagging
• Exercise intolerance
• Cyanosis (bluish discoloration of the mucous membranes due to inadequate oxygenation)
• Fainting or collapse

Diagnosis

Diagnosis of BAOS involves a thorough physical examination, focusing on the respiratory system and facial structure. Specific diagnostic tests may include:

• Radiographs (X-rays) to evaluate the airways and chest
• Endoscopy to directly visualize the airways and assess the severity of the anatomical abnormalities

Treatment

Treatment of BAOS is aimed at relieving the airway obstruction and improving the quality of life for the affected animal. Options include:

• Surgical correction of the anatomical abnormalities, such as resection of the elongated soft palate or widening of the stenotic nares
• Weight management to reduce obesity, which can exacerbate symptoms
• Avoidance of stressful or overheated environments
• In severe cases, a tracheostomy may be necessary to bypass the obstructed airways

Prevention

Prevention of BAOS involves responsible breeding practices to avoid perpetuating the anatomical features that lead to the syndrome. Prospective pet owners are encouraged to research breeds and select animals with less exaggerated brachycephalic features.

See Also

• Canine Hydrocephalus
• Tracheal Collapse
• Snoring
• Respiratory System