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Funnel chest (pectus excavatum)
Pectus excavatum should see which department?
If the patient is relatively young, under 14 years old, and wishes to consult about pectus excavatum care, pediatric healthcare can be considered. However, if the patient is older, or in addition to pediatric healthcare advice, seeks information on how to treat pectus excavatum, it is advisable to consult with a local thoracic surgery department, if available. This is because thoracic surgeons offer not only information on the causes or care of pectus excavatum but also treatment options. Both conservative treatment plans and surgical interventions are available from thoracic surgeons. Of course, not all hospitals have a department of thoracic surgery, but general top-tier hospitals typically do; if there is no thoracic surgery available locally, considering general surgery might be the only alternative.
Is the funnel chest suction cup effective?
If the patient is young and the chest wall still retains some elasticity, or there is a possibility of secondary development, then it might be worth trying a pectus excavatum suction cup. If during the development of the chest wall, the patient's family can actively encourage or supervise the use of the suction cup for over two hours a day, continuing for six months, preferably up to about two years, the suction cup can be somewhat effective. However, if the patient's chest wall is hard and lacks elasticity, or if there is little possibility of further development, then the suction cup might not be suitable for such patients. For patients whose chest wall has fully developed, the best or most definitive treatment for pectus excavatum is surgery. Therefore, while the pectus excavatum suction cup can be useful for some patients, it is not suitable for all patients.
Does pectus excavatum require surgery?
The decision on whether surgery is needed for pectus excavatum depends on the patient's age, the severity of the deformity, and the elasticity of the chest wall. If the patient is very young, under one year old, and the pectus excavatum is not very severe, we recommend a watchful waiting approach. In patients with pectus excavatum under one year old, it is possible that the condition is pseudopectus excavatum, which may improve as they grow and develop within the first year. However, not everyone improves, with about one third of the cases showing improvement within the first year. If the child is older than one year, the likelihood of improvement is basically none, and at this time, conservative treatment using a pectus excavatum suction cup can be considered. If adhered to effectively, the suction cup can have a certain effect for some patients with pectus excavatum. But if the patient is over three to five years old and the chest wall has matured, surgery should be considered. Therefore, for the vast majority of patients with pectus excavatum, surgery is a relatively definitive and immediately effective method.
Can people with pectus excavatum join the military?
Theoretically, the current conscription system does not have strict restrictions on mild cases of pectus excavatum. However, obvious moderate or severe pectus excavatum, or sternums that are inwardly and backwardly concave, can significantly impact the function of both the heart and lungs by compressing them. This inward concavity can restrict the heart’s ability to fully expand, potentially causing complete deformation of the heart, or even prevent the heart’s valves from closing fully, leading to valve regurgitation. Such compromised cardiac and pulmonary functions are likely unable to withstand the physical demands experienced during military service. Therefore, for moderate and severe cases of pectus excavatum, we do not recommend enlisting in the military, although the current policy does not have clear restrictions on mild cases of pectus excavatum.
What should be noted for pectus excavatum in daily life?
The biggest difference between children with pectus excavatum and normal children lies in the middle chest bone structure sinking backwards and inward toward the spine, creating a deformity where the front chest and the back compress each other. Naturally, this completely compresses the normal position of the heart and lungs. Therefore, the heart of such children is compressed and deformed, pushing the entire heart to one side. We have encountered clinically cases where there are just a few millimeters of space between the sternum and the spine, leaving no room for the heart, thus completely compressing and pushing it to the left side. Imagine a heart, completely compressed and deformed, where the valves inside cannot function normally. Hence, some children may exhibit insufficiencies in their tricuspid and mitral valves. Therefore, in children with pectus excavatum, their heart is under pressure, their valves deformed, leading to poor cardiac function, and their lung function is also compromised. Since the lungs also need space to expand, lungs that are completely compressed cannot fully relax, resulting in such children having poor cardiac and lung functions, reduced exercise endurance, and since the lungs cannot fully expand, such children are prone to catching colds. Thus, for children with pectus excavatum, it is important to avoid catching colds. Moreover, treating the root cause of the condition, which is pectus excavatum itself, is crucial. Therefore, correcting pectus excavatum early on is essential.
What should be noted for pectus excavatum?
We know that behind the sternum of a normal person are the heart and lungs. Pectus excavatum is a deformity where this part of the sternum is pressed inward towards the spine. Such inward compression, as it occurs right against the bony spine, will directly squeeze the heart and in severe cases, can lead to insufficiency in the heart valve closure. Therefore, the most critical issue with pectus excavatum is the compression of the heart, which also compresses the lungs. Thus, 80% of children with pectus excavatum have lower exercise capacity compared to normal children, 60% may experience chest pain, and 40% have a significantly higher respiratory rate than normal children. Therefore, for patients with pectus excavatum, it is crucial to be cautious about common colds, as their respiratory and cardiac functions can be greatly affected if they catch a cold.
How is funnel chest formed?
Regarding the cause of pectus excavatum, there have historically been many hypotheses. For a while, medical experts believed that pectus excavatum was caused by the backward pulling of the diaphragm behind the sternum. Thus, for a time, surgeries abroad involved cutting the portion of the diaphragm behind the depressed area of the chest. Eventually, it was discovered that such cutting did not significantly benefit the treatment of pectus excavatum, and the results were not very conclusive. Therefore, this hypothesis was later debunked. To date, it is generally believed that the primary formation of pectus excavatum is somewhat related to genetic or hereditary factors. Of course, not all cases of pectus excavatum are due to parents having the condition; it might be present in the genes of ancestors and only manifest in the current generation or in this patient. Additionally, pectus excavatum could be associated with other diseases, such as connective tissue disorders. For example, some patients might have congenital diaphragmatic hernias, and after surgical repair, they could be prone to pneumothorax. Furthermore, some patients may suffer from pectus excavatum due to subglottic stenosis and underdeveloped bronchopulmonary structures, possibly triggered by respiratory factors. However, no matter the details, the formation of pectus excavatum is directly or indirectly related to congenital genes or heredity.
Funnel chest surgery principle
The Wang procedure, named after Director Wang Wenlin from the Second People's Hospital of Guangdong Province, is a surgical method for correcting pectus excavatum. Traditional minimally invasive techniques for correcting pectus excavatum, such as the Nuss procedure or its modifications, involve placing a metal bar under or behind the sternum, forming an arch to lift the depressed area, similar to a traditional arch bridge. In contrast, the Wang procedure positions the metal bar on top and in front of the sunken sternum, and then uses stainless steel wires to suspend the deformed sternum forward and upward, transforming the traditional arch into a modern cable-stayed bridge, thus suspending the depressed chest area.
Minimally invasive surgery for pectus excavatum
Minimally invasive surgery for pectus excavatum has evolved over the decades, with various surgical methods developing since the most classical NUSS procedure introduced by Donald Nuss in the 1990s. His basic surgical process involves administering general anesthesia to the patient, who is then laid flat on the operating table. A horizontal line is drawn from the deepest part of the depression to the armpit, where one to two small incisions are made under the armpit. The skin is then freed to access the chest cavity, and a steel plate is gradually inserted behind the sternum at its deepest point, after which the depressed sternum is elevated by flipping the plate. Of course, there have been improvements to the NUSS procedure, such as the modified Nuss procedure that reduces the flipping process, thus minimizing the impact and damage to the bones. For instance, ultra-minimally invasive surgeries, which require only a single-port incision, have evolved from the NUSS procedure by reducing or eliminating the need for flipping or an incision. Later, the Wang procedure involved placing the steel plate in front of the sternum, using the principle of a suspension bridge to elevate the depressed sternum. Thus, the evolution of surgery for pectus excavatum continues to advance, with the surgical processes improving, wounds becoming smaller, and the number of incisions decreasing.
Pectus excavatum heart hazards
Pectus excavatum can harm the patient's or child's heart, primarily manifesting in compression of the heart and affecting the function of the internal heart valves. Imagine a normal person's rib cage, which is oval in cross-section. There is a certain ratio between the lateral diameter and the anterior-posterior diameter, with normal individuals having a ratio of less than 2.5. However, in patients with pectus excavatum, this anterior-posterior diameter is significantly compressed, meaning the sternum moves closer to the spine, compressing inward and backward, squeezing the heart - this is the first step. The heart itself is a contractile muscular organ, its purpose being to eject blood and circulate it throughout the body. If the sternum and spine directly compress the heart, preventing it from fully expanding, then blood cannot fully flow back into the heart, and thus the ejection or pumping function of the heart will be impacted. Secondly, besides the heart being compressed, just like a house becoming deformed from being squeezed, the doors within the house cannot function properly; they cannot close or open well. Thus, pectus excavatum not only compresses the heart itself but also severely harms the function of the heart valves, even causing mitral valve prolapse in some patients.