Lung lobe torsion in dogs occurs when the lung lobe twists, leading to the blockage of the bronchus and associated vessels, including veins and arteries. This blockage causes the affected lung lobe to fill with blood, resulting in tissue necrosis and eventual death. Complications may include symptoms such as coughing up blood, increased heart rate (tachycardia), or shock.
Male dogs face a higher susceptibility to lung lobe torsion compared to females, particularly large breeds with deep chests. However, small dog breeds like pugs, especially those under four years old, also face risks, often experiencing spontaneous lung lobe torsion.
Symptoms and Types
- Pain
- Fever
- Lethargy
- Loss of appetite (anorexia)
- Coughing (occasionally with blood)
- Difficulty breathing, particularly when lying flat (orthopnea)
- Increased respiration rate
- Coughing up blood
- Elevated heart rate
- Pale or bluish mucous membranes (cyanosis)
- Shock
Causes
Lung lobe torsion is occasionally associated with pre-existing conditions like trauma, neoplasia, and chylothorax. However, it can also happen spontaneously, following thoracic or diaphragmatic surgery, or in rare cases, for an unknown reason (idiopathic).
Diagnosis
Provide a detailed history of your dog’s health, including the onset and nature of symptoms, to your veterinarian. They will conduct a thorough physical examination along with a biochemistry profile, urinalysis, and complete blood count (CBC). These tests can offer valuable insights for the initial diagnosis, indicating signs of infection or anemia, and assessing your dog’s immune response. A significantly low white blood cell count below the normal range suggests a poor prognosis.
The veterinarian may opt to extract a small sample of accumulated fluid for further analysis. Additionally, ultrasound, computed tomography, and radiographic studies can provide more detailed information about the condition. X-rays typically reveal loss of normal lung architecture and blood vessels, along with opacification of the affected lung. In certain cases, surgery becomes necessary for definitive diagnosis and treatment.
Treatment
Hospitalization may be necessary for your dog, particularly if surgery is needed, which is often the preferred treatment to remove the affected lobe and address other abnormalities. If abnormal fluid or blood is present, your veterinarian will insert a chest tube to facilitate drainage. Ventilator support may be provided if your dog experiences difficulty breathing. Treatment typically includes oxygen therapy, fluids, and antibiotics. If the dog survives, shrinking and fibrosis of the affected lobe will occur.
Living and Management
Following surgery, your dog may experience soreness and require pain medication, along with cage rest, for several days. Fortunately, most animals fully recover after a successful operation. The chest tube is typically left in place for a few days to facilitate fluid drainage. Your veterinarian will provide instructions on how to properly manage this tube. If you notice any concerning symptoms, such as breathing difficulties, promptly contact your dog’s veterinarian. Otherwise, adhere to their guidance and schedule regular examinations for your dog.
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