Bochdalek hernia

In normal Bochdalek hernia cases, the symptoms are often observable simultaneously with the baby's birth. A few of the symptoms of a Bochdalek Hernia include difficulty breathing, fast respiration and increased heart rate. Also, if the baby appears to have cyanosis (blue-tinted skin) this can also be a sign.[2] Another way to differentiate a healthy baby from a baby with Bochdalek Hernia, is to look at the chest immediately after birth. If the baby has a Bochdalek Hernia it may appear that one side of the chest cavity is larger than the other and or the abdomen seems to be scaphoid (caved in).[3]

Most likely, Bochdalek hernias are formed throughout the growth process and organ construction during fetal development. During fetal development, the diaphragm is formed between the seventh and tenth week. Also, during this time, the esophagus, stomach, and intestines are formed. Therefore, a Bochdalek hernia forms either from malformation of the diaphragm, or the intestines become locked into the chest cavity during the construction of the diaphragm. Although these are some factors that contribute to a Bochdalek hernia, it does not take all variables into account. Bochdalek hernias, along with Morgagni hernias, are both multifactor conditions, meaning that there are many reasons and multiple variables that contribute to the malformations. For example, in each case there could be genetic and or environmental condition(s) that can add to the probability of this birth defect.[3]

One way to determine if a baby does in fact have a Bochdalek hernia, would be to have a pediatrician perform a physical on the infant. A chest x-ray can also be done to examine the abnormalities of not only the lungs but also the diaphragm and the intestine. In addition to these, a doctor can also take a blood test, drawing arterial blood to check and determine how well the baby is breathing and his or her ability to breathe. A chromosomal test (done by testing the blood) can also be performed to determine whether or not the problem was genetic. The doctors can also take an ultrasound of the heart (echocardiogram) to evaluate the health of the heart.

There are different pathways for treatment available. The first step in treatment includes the baby's admission into the NICU (Neonatal Intensive Care Unit).[3] The preferred path of treatment for most Bochdalek Hernia is that babies who are admitted in the NICU, are placed on a mechanical ventilator to help breathing. Very rarely will the hernia be small enough that it is not noticed. It is more likely to be asymptomatic if it is on the right side of the chest. If the infant cannot be stabilized using medical treatments and mechanical ventilation, the alternate pathway involves putting the infants on a temporary heart/lung bypass machine, called ECMO, which stands for extra-corporeal membrane oxygenation.[3] ECMO allows oxygen to be regulated into the blood and then pumps the blood throughout the entire body. Normally, this machine is used to stabilize the baby's condition. It is preferred to stabilize the infant prior to surgery, to minimize complications, if possible. The only treatment is surgery.[4]

After the baby is stable and his or her state has improved, the diaphragm can be fixed and the misplaced organs can be relocated to their correct position. That is either done via primary repair where the remaining diaphragm is stretched to cover the hole, or an abdominal muscle is split so it can be used to stretch over the hole, and the last option is with a Gor-Tex patch, which has higher risks of later infection or re-herniation.[3] Although these are various treatments for Bochdalek Hernias, it does not guarantee the baby will survive.[3] Since the baby must go through some or all of the previous treatments, the baby's hospital stay is usually longer than that of a "normal" newborn. The average infants born with a Bochdalek Hernia stay in the hospital between 23.1 and 26.8 days.[5] An infant needing to go on ECMO will have a longer stay and likely worse outcome than one who was stabilized without ECMO.

Bochdalek hernia can be a life-threatening condition. Approximately 85.3% of newborns born with a Bochdalek hernia are immediately high risk.[6] Infants born with a Bochdalek hernia have a "high mortality rate due to respiratory insufficiency".[7] Between 25–60% of infants with a Bochdalek hernia die.[5] The lungs, diaphragm, and digestive system are all forming at the same time, so when a Bochdalek hernia permits the abdominal organs to invade the chest cavity rather than remain under the diaphragm in the correct position, it puts the infant in critical condition. These "foreign bodies" in the chest cavity compress the lungs, impairing their proper development and causing pulmonary hypoplasia.[3] Since the lungs of infants suffering from a Bochdalek hernia have fewer alveoli than normal lungs, Bochdalek hernias are life-threatening conditions due to respiratory distress.[3] Also, if the invasion of the intestine or stomach punctures the lung, then the lungs cannot fill completely with air. The baby will not be healthy or stable with this condition because he or she cannot take in enough air and oxygen to keep the body operating properly. Like the lungs, the intestines may also have trouble developing correctly. If the intestines are trapped within the lungs, then the lungs and intestines may not be receiving the amount of blood they need to stay healthy and function properly.

Bochdalek hernias make up about 0.17% to 6% of all diaphragmatic hernia cases when they appear spontaneously in adults and about one in every 2200 to 12,500 births every year.[2] Babies who are born with a Bochdalek hernia are more than likely to have another birth defect caused by the hernia. About twenty percent of those children born with a Bochdalek hernia, also have a congenital heart defect. In addition, infants born with this condition may also have other abnormalities. "Between five and sixteen [percent of infants] have a chromosomal abnormality."[3] In most cases, left-sided hernias or Bochdalek hernias have a ratio of 3:2 of males to females. In other words, Bochdalek hernias are more common in men.

A useful way to remember the localization of this hernia vs. Morgagni is "Bochdalek is back and to the left" (re the postero-lateral localization).