Funnel Chest in Dogs (Pectus excavatum)
- Synonyms: Funnel chest, sternocostal dysplasia
- Occurrence: very rare
- Location of disease: Chest
When to visit the vet?
Non-urgent see a veterinarian within 2–3 days
If the condition worsens / symptoms persist, consult a veterinarian.
Definition
Pectus excavatum, also known as funnel chest or sternal bone deformity, is a congenital malformation of the chest in dogs, in which the sternum is depressed inward, leading to a characteristic indentation of the chest.
The most important facts at a glance
Pectus excavatum, also known as funnel chest, is a rare congenital deformity of the sternum in dogs that occurs more frequently in certain breeds such as Bulldogs and Boston Terriers. The exact cause is not yet fully understood; however, genetic factors play a significant role. This malformation results from a developmental error of the thoracic wall during embryonic development, leading to an inward curving of the sternum that can compress the heart and lungs, thereby impairing respiratory and cardiac functions.
Symptoms include respiratory distress, limited mobility, cough, frequent lung infections, weight loss, and loss of appetite. Diagnosis is made through physical examination as well as imaging procedures such as X-ray or CT. In mild cases, conservative therapy may be sufficient, while in severe cases, surgical correction is required to reposition the sternum and stabilize the thoracic wall. The prognosis depends on the severity of the deformity; with successful treatment, it is generally positive.
Since the condition is congenital, there are no specific preventive measures; however, the selection of breeding animals can reduce the risk. Research focuses on genetic causes, the improvement of treatment methods, and the effects on heart and lung function to improve the quality of life for affected dogs. Advances in early detection and treatment promise a better future for dogs with pectus excavatum.
Causes
Pectus excavatum is a relatively rare condition in dogs, but it can occur more frequently in certain breeds. The exact cause of this deformity is not fully understood, but genetic factors are believed to play a significant role. The condition can occur in both male and female dogs, and there is some evidence that it is more common in certain breeds such as Bulldogs and Boston Terriers.
Scientifically speaking, pectus excavatum develops due to abnormal development of the ventral thoracic wall during embryonic development. This abnormal development causes the sternum to form incorrectly and curve inward. The resulting indentation can lead to compression of internal organs, particularly the heart and lungs, which can impair respiratory and cardiac function.
The causes of pectus excavatum are varied and can include both genetic and environmental factors. Genetic studies suggest that it is a polygenic condition involving multiple genes. Environmental factors, such as the position of the fetus in the womb or traumas during birth, may also play a role.
Symptoms
The symptoms of pectus excavatum can vary considerably depending on the severity of the deformity. In mild cases, the indentation of the chest may only be a cosmetic issue and cause no obvious health impairments. In more severe cases, however, a variety of symptoms may occur that are caused by compression of the heart and lungs.
The most common symptoms include respiratory distress, which can manifest as rapid or labored breathing, coughing, or a wheezing breath sound. Dogs with a severe form of the disease may also show signs of lethargy, decreased exercise tolerance, or a reluctance to play. In some cases, the deformity can also lead to heart problems, manifesting as heart murmurs or abnormal heart rhythms.
Therapy
Treatment of pectus excavatum depends on the severity of the condition and associated symptoms. In mild cases where there are no significant respiratory or cardiac problems, conservative treatment may be sufficient. This may include physical therapy and breathing exercises to improve lung function and strengthen chest muscles.
In more severe cases, especially when the deformity significantly impairs heart or lung function, surgical intervention may be required. Surgical correction of pectus excavatum usually involves repositioning the sternum and stabilizing the thoracic wall to restore normal anatomy. Depending on the individual situation, various surgical techniques may be used, and the choice of method depends on factors such as the dog’s age and the extent of the deformity.
Prognosis and follow-up care
The prognosis for dogs with pectus excavatum largely depends on the severity of the deformity and the effectiveness of the treatment. Dogs with a mild form of the condition that show no significant symptoms generally have a good prognosis and can lead a normal life. For dogs that have undergone successful surgery to correct the deformity, the prognosis is also positive, provided there are no further health complications.
In cases where the deformity remains untreated or treatment is unsuccessful, the prognosis may be less favorable, especially if respiratory or cardiac function is severely impaired. Early diagnosis and intervention are crucial to improving the affected dog’s quality of life and minimizing potential complications.
Prevention
Since pectus excavatum is a congenital condition, there are no specific preventive measures to prevent a dog from being born with this deformity. However, selecting breeding animals with a known genetic predisposition for the disease can play a role in reducing the risk within the breeding population.
Pet owners who own or breed dogs that are prone to pectus excavatum should watch for signs of the disease and seek veterinary advice early if they suspect their animal may be affected. Early detection and, if necessary, timely treatment can help reduce the risk of complications and improve the dog’s quality of life.
Outlook on current research
Funnel chest, also called pectus excavatum, is a congenital deformity of the chest in which the sternum is pulled inward toward the spine. This condition is relatively rare in dogs, but when it occurs, it can impair breathing and heart function. Research in this field focuses primarily on genetic causes and the best treatment methods to improve the quality of life for affected dogs.
One aspect of current research is the investigation of genetic factors contributing to the development of pectus excavatum. Scientists are analyzing genetic predisposition to understand which genes may be responsible. These studies are crucial for developing preventive measures and understanding which breeds are more susceptible to this anomaly.
Another important area of research is the development and improvement of surgical techniques to correct the deformity. The traditional method is surgical correction by placing a metal bar that pushes the sternum back into its normal position. Researchers are working on less invasive techniques and materials that lead to fewer complications and faster recovery times.
Additionally, the effectiveness and safety of non-surgical approaches are being investigated, such as the use of vacuum bells that slowly lift the sternum. These methods could represent an alternative treatment option for milder cases and are currently being tested in clinical trials.
The effects of pectus excavatum on heart and lung function are another focus of research. Studies aim to understand in more detail how severely the deformity affects internal organs and what the long-term prognosis is for affected dogs. This information is crucial for individually tailoring the urgency and type of therapy.
In recent years, there has been encouraging progress in the early detection of the disease. Through the use of advanced imaging techniques such as 3D computed tomography, veterinarians can more accurately assess the severity of the deformity and thus develop appropriate treatment strategies early on. Research is also focusing on making these technologies more accessible and cost-effective.
The combination of genetic research, surgical innovations, and improved diagnostic techniques promises a bright future for the treatment of pectus excavatum in dogs. Despite the rarity of the condition in dogs, research is leading to an increasingly better understanding, which should ultimately lead to better outcomes for affected animals.
Research initiatives worldwide focus on interdisciplinary approaches that incorporate both veterinary and human medical findings. Since pectus excavatum also occurs in humans, insights from human medicine can help develop new treatment approaches for dogs—and vice versa.
One of the biggest challenges remains funding and access to sufficiently large samples for clinical trials. Most studies are limited to small populations, which can restrict the generalizability of the results. Nevertheless, the scientific community is actively working to overcome these hurdles.
In summary, research on pectus excavatum in dogs is being intensified on several levels to better understand the causes, treatment options, and long-term effects of the disease. These efforts are crucial to enabling affected dogs to have a better quality of life.
Frequently Asked Questions (FAQs)
1. What is pectus excavatum in dogs?
2. Which breeds are most commonly affected?
3. How is the diagnosis made?
4. What Treatment Options are Available?
5. Is the disease curable?
6. Can other animals also be affected?
7. What complications can occur?
8. Are there preventive measures?
9. How high are the costs for treatment?
10. How does the disease affect life expectancy?
Literature
- Hassan, E. A., Hassan, M. H., & Torad, F. A. (2018). Correlation between clinical severity and type and degree of pectus excavatum in twelve brachycephalic dogs. Journal of Veterinary Medical Science, 80(5), 766–771. https://doi.org/10.1292/jvms.17-0518
- Pereira, K. H. N. P., Fuchs, K. de M., Terçariol, L. A. A., Silva, R. C., Camargo, G. de A., Mendonça, J. C., Paulino, N. T., Zone, M. A., Oba, E., & Lourenço, M. L. G. (2023). Two types of management for the noninvasive treatment of pectus excavatum in neonatal puppies—Case reports. Animals, 13(5), 906. https://doi.org/10.3390/ani13050906
- Bobis Villagrà, D., & Charlesworth, T. M. (2022). A novel video-assisted thoracoscopic approach for pectus excavatum surgical treatment in a dog. Veterinary Surgery, 51(6), 1009–1015. https://doi.org/10.1111/vsu.13843
- Fossum, T. W., Boudrieau, R. J., Hobson, H. P., & Rudy, R. L. (1989). Surgical correction of pectus excavatum, using external splintage in two dogs and a cat. Journal of the American Veterinary Medical Association, 195(1), 91–97.
- Rahal, S. C., Morishin Filho, M. M., Hatschbach, E., Machado, V. M. V., Aptekmann, K. P., & Corrêa, T. P. (2008). Pectus excavatum in two littermate dogs. Canadian Veterinary Journal, 49(9), 880–884.
- Komsta, R., Łojszczyk, A., Dębiak, P., Twardowski, P., & Lisiak, B. (2019). Prevalence of pectus excavatum (PE), pectus carinatum (PC), tracheal hypoplasia, thoracic spine deformities and lateral heart displacement in thoracic radiographs of screw-tailed brachycephalic dogs. PLOS ONE, 14(10), e0223642. https://doi.org/10.1371/journal.pone.0223642
- van den Broek, D. H. N., Heuts, B. A., & Hermans, J. J. (2023). Sternal abnormalities on thoracic radiographs of dogs and cats. Animals, 13(7), 1233. https://doi.org/10.3390/ani13071233