Spina bifida

Spina bifida

Illustration of a child with spina bifida
Classification and external resources
Specialty Pediatrics, neurosurgery
ICD-10 Q05, Q76.0
ICD-9-CM 741, 756.17
OMIM 182940
DiseasesDB 12306
eMedicine orthoped/557
Patient UK Spina bifida
MeSH C10.500.680.800

Spina bifida (Latin: "split spine") is a birth defect where there is incomplete closing of the backbone and membranes around the spinal cord. There are three main types: spina bifida occulta, meningocele, and myelomeningocele.[1] The most common location is the lower back, but in rare cases it may be the middle back or neck.[2] Occulta has no or only mild signs.[3] Signs of occulta may include a hairy patch, dimple, dark spot, or swelling on the back at the site of the gap in the spine. Meningocele typically causes mild problems with a sac of fluid present at the gap in the spine.[1] Myelomeningocele, also known as open spina bifida, is the most severe form. Associated problems include poor ability to walk, problems with bladder or bowel control, hydrocephalus, a tethered spinal cord, and latex allergy.[4] Learning problems are relatively uncommon.[4]

Spina bifida is believed to be due to a combination of genetic and environmental factors.[5] After having one child with the condition or if one of the parents has the condition, there is a 4% chance that the next child will also be affected.[6] Not having enough folate in the diet during pregnancy also plays a significant role.[5] Other risk factors include certain antiseizure medications, obesity, and poorly controlled diabetes.[6] Diagnosis may occur either before or after a child is born. Before birth if a blood test or amniocentesis finds a high level of alpha-fetoprotein (AFP), there is a higher risk of spina bifida. Ultrasound examination may also detect the problem. Medical imaging can confirm the diagnosis after birth.[3] It is a type of neural tube defect with other types including anencephaly and encephalocele.[7]

Most cases of spina bifida can be prevented if the mother gets enough folate before and during pregnancy.[5] Adding folic acid to flour has been found to be effective for most women.[8] Open spina bifida can be surgically closed before or after birth. A shunt may be needed in those with hydrocephalus, and a tethered spinal cord may be surgically repaired. Devices to help with movement such as crutches or wheelchairs may be useful. Urinary catheterization may also be needed.[9]

About 5% of people have spina bifida occulta.[10] Rates of other types of spina bifida vary significantly by country, from 0.1 to 5 per 1000 births.[11] On average in developed countries it occurs in about 0.4 per 1000 births.[12] In the United States, it affected about 0.7 per 1000 births,[6] and in India, about 1.9 per 1000 births.[13] Part of this difference is believed to be due to race – with Caucasians at higher risk – and partly due to environmental factors.[14]

Types

Different types of spina bifida

Spina bifida occulta

Occulta is Latin for "hidden". This is the mildest form of spina bifida.[15] In occulta, the outer part of some of the vertebrae is not completely closed.[16] The splits in the vertebrae are so small that the spinal cord does not protrude. The skin at the site of the lesion may be normal, or it may have some hair growing from it; there may be a dimple in the skin, or a birthmark.[17] Unlike most other types of neural tube defects, spina bifida occulta is not associated with increased AFP, a common screening tool used to detect neural tube defects in utero. This is because, unlike most of the other neural tube defects, the dural lining is maintained.

Many people with this type of spina bifida do not even know they have it, as the condition is asymptomatic in most cases.[17] The incidence of spina bifida occulta is approximately 10-20% of the population,[18][19] and most people are diagnosed incidentally from spinal X-rays. A systematic review of radiographic research studies found no relationship between spina bifida occulta and back pain.[20] More recent studies not included in the review support the negative findings.[21][22][23]

However, other studies suggest spina bifida occulta is not always harmless. One study found that among patients with back pain, severity is worse if spina bifida occulta is present.[24][25] Among females, this could be mistaken for dysmenorrhea.

Incomplete posterior fusion is not a true spina bifida, and is very rarely of neurological significance.[26]

Meningocele

A posterior meningocele (pronounced /məˈnɪŋɡəˌsil/) or meningeal cyst (pronounced /mɪˈnɪndʒiəl/ /sɪst/) is the least common form of spina bifida. In this form, the vertebrae develop normally, but the meninges are forced into the gaps between the vertebrae. As the nervous system remains undamaged, individuals with meningocele are unlikely to suffer long-term health problems, although cases of tethered cord have been reported. Causes of meningocele include teratoma and other tumors of the sacrococcyx and of the presacral space, and Currarino syndrome.

A meningocele may also form through dehiscences in the base of the skull. These may be classified by their localisation to occipital, frontoethmoidal, or nasal. Endonasal meningoceles lie at the roof of the nasal cavity and may be mistaken for a nasal polyp. They are treated surgically. Encephalomeningoceles are classified in the same way and also contain brain tissue.

Myelomeningocele

Myelomeningocele, also known as meningomyelocele, is the type of spina bifida that often results in the most severe complications.[27] In individuals with myelomeningocele, the unfused portion of the spinal column allows the spinal cord to protrude through an opening. The meningeal membranes that cover the spinal cord also protrude through the opening, forming a sac enclosing the spinal elements.

Myeloschisis

Spina bifida with myeloschisis is the most severe form of myelomeningocele. In this type, the involved area is represented by a flattened, plate-like mass of nervous tissue with no overlying membrane. The exposure of these nerves and tissues make the baby more prone to life-threatening infections such as meningitis.[28]

The protruding portion of the spinal cord and the nerves that originate at that level of the cord are damaged or not properly developed. As a result, there is usually some degree of paralysis and loss of sensation below the level of the spinal cord defect. Thus, the more cranial the level of the defect, the more severe the associated nerve dysfunction and resultant paralysis may be. Symptoms may include ambulatory problems, loss of sensation, deformities of the hips, knees or feet, and loss of muscle tone.

Signs and symptoms

Physical problems

Physical signs of spina bifida may include:

68% of children with spina bifida have an allergy to latex,[31] ranging from mild to life-threatening. The common use of latex in medical facilities makes this a particularly serious concern. The most common approach to avoid developing an allergy is to avoid contact with latex-containing products such as examination gloves and condoms and catheters that do not specify they are latex free, and many other products, such as some commonly used by dentists.[16]

The spinal cord lesion or the scarring due to surgery may result in a tethered spinal cord. In some individuals, this causes significant traction and stress on the spinal cord and can lead to a worsening of associated paralysis, scoliosis, back pain, and worsening bowel and/or bladder function.[32]

Neurological problems

Many individuals with spina bifida have an associated abnormality of the cerebellum, called the Arnold Chiari II malformation. In affected individuals, the back portion of the brain is displaced from the back of the skull down into the upper neck. In about 90% of the people with myelomeningocele, hydrocephalus also occurs because the displaced cerebellum interferes with the normal flow of cerebrospinal fluid, causing an excess of the fluid to accumulate.[33] In fact, the cerebellum also tends to be smaller in individuals with spina bifida, especially for those with higher lesion levels.[30]

The corpus callosum is abnormally developed in 70-90% of individuals with spina bifida myelomeningocele; this affects the communication processes between the left and right brain hemispheres.[34] Further, white matter tracts connecting posterior brain regions with anterior regions appear less organized. White matter tracts between frontal regions have also been found to be impaired.[30]

Cortex abnormalities may also be present. For example, frontal regions of the brain tend to be thicker than expected, while posterior and parietal regions are thinner. Thinner sections of the brain are also associated with increased cortical folding.[30] Neurons within the cortex may also be displaced.[35]

Executive function

Several studies have demonstrated difficulties with executive functions in youth with spina bifida,[36][37] with greater deficits observed in youth with shunted hydrocephalus.[38] Unlike typically developing children, youths with spina bifida do not tend to improve in their executive functioning as they grow older.[37] Specific areas of difficulty in some individuals include planning, organizing, initiating, and working memory. Problem-solving, abstraction, and visual planning may also be impaired.[39] Further, children with spina bifida may have poor cognitive flexibility. Although executive functions are often attributed to the frontal lobes of the brain, individuals with spina bifida have intact frontal lobes; therefore, other areas of the brain may be implicated.[38]

Individuals with spina bifida, especially those with shunted hydrocephalus, often have attention problems. Children with spina bifida and shunted hydrocephalus have higher rates of ADHD than children without those conditions (31% vs. 17%).[36] Deficits have been observed for selective attention and focused attention, although poor motor speed may contribute to poor scores on tests of attention.[38][40] Attention deficits may be evident at a very early age, as infants with spina bifida lag behind their peers in orienting to faces.[41]

Academic skills

Individuals with spina bifida may struggle academically, especially in the subjects of mathematics and reading. In one study, 60% of children with spina bifida were diagnosed with a learning disability.[42] In addition to brain abnormalities directly related to various academic skills, achievement is likely affected by impaired attentional control and executive functioning.[35] Children with spina bifida may perform well in elementary school, but begin to struggle as academic demands increase.

Children with spina bifida are more likely than their peers without spina bifida to be dyscalculic.[43] Individuals with spina bifida have demonstrated stable difficulties with arithmetic accuracy and speed, mathematical problem-solving, and general use and understanding of numbers in everyday life.[44] Mathematics difficulties may be directly related to the thinning of the parietal lobes (regions implicated in mathematical functioning) and indirectly associated with deformities of the cerebellum and midbrain that affect other functions involved in mathematical skills. Further, higher numbers of shunt revisions are associated with poorer mathematics abilities.[45] Working memory and inhibitory control deficiencies have been implicated for math difficulties,[46] although visual-spatial difficulties are not likely involved.[43] Early intervention to address mathematics difficulties and associated executive functions is crucial.[46]

Individuals with spina bifida tend to have better reading skills than mathematics skills.[45] Children and adults with spina bifida have stronger abilities in reading accuracy than in reading comprehension.[47] Comprehension may be especially impaired for text that requires an abstract synthesis of information rather than a more literal understanding.[48] Individuals with spina bifida may have difficulty with writing due to deficits in fine motor control and working memory.[47]

Cause

Spina bifida is believed to be caused by a combination of genetic and environmental factors.[5] After having one child with the condition, or if a parent has the condition, there is a 4% chance the next child will also be affected.[6] A folic acid deficiency during pregnancy also plays a significant role.[5] Other risk factors include certain antiseizure medications, obesity, and poorly managed diabetes.[6]

Pathophysiology

Spina bifida is sometimes caused by the failure of the neural tube to close during the first month of embryonic development (often before the mother knows she is pregnant). Some forms are known to occur with primary conditions that cause raised central nervous system pressure, which raises the possibility of a dual pathogenesis.

In normal circumstances, the closure of the neural tube occurs around the 23rd (rostral closure) and 27th (caudal closure) day after fertilization.[49] However, if something interferes and the tube fails to close properly, a neural tube defect will occur. Medications such as some anticonvulsants, diabetes, obesity, and having a relative with spina bifida can all affect the probability of neural tube malformation.

Extensive evidence from mouse strains with spina bifida indicates that there is sometimes a genetic basis for the condition. Human spina bifida, like other human diseases, such as cancer, hypertension and atherosclerosis (coronary artery disease), likely results from the interaction of multiple genes and environmental factors.

Research has shown the lack of folic acid (folate) is a contributing factor in the pathogenesis of neural tube defects, including spina bifida. Supplementation of the mother's diet with folate can reduce the incidence of neural tube defects by about 70%, and can also decrease the severity of these defects when they occur.[50][51][52] It is unknown how or why folic acid has this effect.

Spina bifida does not follow direct patterns of heredity like muscular dystrophy or haemophilia. Studies show a woman having had one child with a neural tube defect such as spina bifida has about a 3% risk of having another affected child. This risk can be reduced with folic acid supplementation before pregnancy. For the general population, low-dose folic acid supplements are advised (0.4 mg/day).

Prevention

There is neither a single cause of spina bifida nor any known way to prevent it entirely. However, dietary supplementation with folic acid has been shown to be helpful in reducing the incidence of spina bifida. Sources of folic acid include whole grains, fortified breakfast cereals, dried beans, leaf vegetables and fruits.[53]

Folate fortification of enriched grain products has been mandatory in the United States since 1998. The U.S. Food and Drug Administration, Public Health Agency of Canada[54] and UK recommended amount of folic acid for women of childbearing age and women planning to become pregnant is at least 0.4 mg/day of folic acid from at least three months before conception, and continued for the first 12 weeks of pregnancy.[55] Women who have already had a baby with spina bifida or other type of neural tube defect, or are taking anticonvulsant medication should take a higher dose of 4–5 mg/day.[55]

Certain mutations in the gene VANGL1 are implicated as a risk factor for spina bifida: These mutations have been linked with spina bifida in some families with a history of spina bifida.[56]

Screening

Open spina bifida can usually be detected during pregnancy by fetal ultrasound. Increased levels of maternal serum alpha-fetoprotein (MSAFP) should be followed up by two tests - an ultrasound of the fetal spine and amniocentesis of the mother's amniotic fluid (to test for alpha-fetoprotein and acetylcholinesterase). AFP tests are now mandated by some state laws (including California). and failure to provide them can have legal ramifications. In one case a man born with spina bifida was awarded a $2 million settlement after court found his mother's OBGYN negligent for not performing these tests.[57] Spina bifida may be associated with other malformations as in dysmorphic syndromes, often resulting in spontaneous miscarriage. In the majority of cases, though, spina bifida is an isolated malformation.

Genetic counseling and further genetic testing, such as amniocentesis, may be offered during the pregnancy, as some neural tube defects are associated with genetic disorders such as trisomy 18. Ultrasound screening for spina bifida is partly responsible for the decline in new cases, because many pregnancies are terminated out of fear that a newborn might have a poor future quality of life. With modern medical care, the quality of life of patients has greatly improved.[49]

Treatment

There is no known cure for nerve damage caused by spina bifida. Standard treatment is surgery after delivery. This surgery aims to prevent further damage of the nervous tissue and to prevent infection, pediatric neurosurgeons operate to close the opening on the back. The spinal cord and its nerve roots are put back inside the spine and covered with meninges. In addition, a shunt may be surgically installed to provide a continuous drain for the excess cerebrospinal fluid produced in the brain, as happens with hydrocephalus. Shunts most commonly drain into the abdomen or chest wall.

Pregnancy

Standard treatment is after delivery. There is tentative evidence about treatment before delivery while the baby is inside the womb for severe disease.[58] As of 2014 the evidence; however, remains insufficient to determine benefits and harms.[59]

Treatment of spina bifida during pregnancy in not without risk.[58] To the mother, this includes scarring of the uterus.[58] To the baby, there is the risk of preterm birth.[58]

Broadly, there are two forms of prenatal treatment. The first is open fetal surgery, where the uterus is opened and the spina bifida repair performed. The second is via fetoscopy. These techniques may be an option to standard therapy.[60]

Childhood

Most individuals with myelomeningocele will need periodic evaluations by a variety of specialists:[61]

Transition to adulthood

Although many children's hospitals feature integrated multidisciplinary teams to coordinate healthcare of youth with spina bifida, the transition to adult healthcare can be difficult because the above healthcare professionals operate independently of each other, requiring separate appointments and communicate among each other much less frequently. Healthcare professionals working with adults may also be less knowledgeable about spina bifida because it is considered a childhood chronic health condition.[62] Due to the potential difficulties of the transition, adolescents with spina bifida and their families are encouraged to begin to prepare for the transition around ages 14–16, although this may vary depending on the adolescent's cognitive and physical abilities and available family support. The transition itself should be gradual and flexible. The adolescent's multidisciplinary treatment team may aid in the process by preparing comprehensive, up-to-date documents detailing the adolescent's medical care, including information about medications, surgery, therapies, and recommendations. A transition plan and aid in identifying adult healthcare professionals are also helpful to include in the transition process.[62]

Further complicating the transition process is the tendency for youths with spina bifida to be delayed in the development of autonomy,[63] with boys particularly at risk for slower development of independence.[64] An increased dependence on others (in particular family members) may interfere with the adolescent's self-management of health-related tasks, such as catheterization, bowel management, and taking medications.[65] As part of the transition process, it is beneficial to begin discussions at an early age about educational and vocational goals, independent living, and community involvement.[66]

Epidemiology

About 5% of people have spina bifida occulta.[10] Rates of other types of spina bifida vary significantly by country from 0.1 to 5 per 1000 births.[11] On average in developed countries it occurs in about 0.4 per 1000 births.[12] In the United States it affected about 0.7 per 1000 births,[6] and in India about 1.9 per 1000 births.[13] Part of this difference is believed to be due to race with Caucasians at higher risk and part due to environmental factors.[14]

In the United States rates are higher on the East Coast than on the West Coast, and higher in white people (one case per 1000 live births) than in black people (0.1–0.4 case per 1000 live births). Immigrants from Ireland have a higher incidence of spina bifida than do natives.[67][68] Highest rates of the defect in the USA can be found in Hispanic youth.[69]

The highest incidence rates worldwide were found in Ireland and Wales, where three to four cases of myelomeningocele per 1000 population have been reported during the 1970s, along with more than six cases of anencephaly (both live births and stillbirths) per 1000 population. The reported overall incidence of myelomeningocele in the British Isles was 2.0–3.5 cases per 1000 births.[67][68] Since then, the rate has fallen dramatically with 0.15 per 1000 live births reported in 1998,[49] though this decline is partially accounted for because some fetuses are aborted when tests show signs of spina bifida (see Pregnancy screening above).

Research

Surgeons at Vanderbilt University, led by Joseph Bruner, attempted to close spina bifida in 4 human fetuses using a skin graft from the mother using a laparoscope. Four cases were performed before stopping the procedure - two of the four fetuses died.[74]

Fetal surgery after 25 weeks has not shown benefit in subsequent studies.[76]

MOMS trial

Management of myelomeningocele study (MOMS) was a phase III clinical trial designed to compare two approaches to the treatment of spina bifida: surgery before birth and surgery after birth.[77][78]

The trial concluded that the outcomes after prenatal spina bifida treatment are improved to the degree that the benefits of the surgery outweigh the maternal risks. This conclusion requires a value judgment on the relative value of fetal and maternal outcomes on which opinion is still divided.[79]

To be specific, the study found that prenatal repair resulted in:

[80] At one year of age, 40 percent of the children in the prenatal surgery group had received a shunt, compared to 83 percent of the children in the postnatal group. During pregnancy, all the fetuses in the trial had hindbrain herniation. However, at age 12 months, one-third (36 percent) of the infants in the prenatal surgery group no longer had any evidence of hindbrain herniation, compared to only 4 percent in the postnatal surgery group.[80] Further surveillance is ongoing.[81]

Fetoscopic surgery

In contrast to the open fetal operative approach performed in the MOMS trial, a minimally invasive fetoscopic approach (akin to 'keyhole' surgery) has been developed. This approach has been evaluated by independent authors of a controlled study which showed some benefit in survivors,[82] but others are more skeptical[83]

The observations in mothers and their fetuses that were operated over the past two and a half years by the matured minimally invasive approach showed the following results: Compared to the open fetal surgery technique, fetoscopic repair of myelomeningocele results in far less surgical trauma to the mother, as large incisions of her abdomen and uterus are not required. In contrast, the initial punctures have a diameter of 1.2 mm only. As a result, thinning of the uterine wall or dehisscence which have been among the most worriesome and criticized complications after the open operative approach do not occur following minimally invasive fetoscopic closure of spina bifida aperta. The risks of maternal chorioamniotis or fetal death as a result of the fetoscopic procedure run below 5%.[84][85][86] Women are discharged home from hospital one week after the procedure. There is no need for chronic administration of tocolytic agents since postoperative uterine contractions are barely ever observed. The current cost of the entire fetoscopic procedure, including hospital stay, drugs, perioperative clinical, ECG, ultrasound and MRI-examinations, is approximately €16,000.

In 2012, these results of the fetoscopic approach were presented at various national and international meetings, among them at the 1st European Symposium “Fetal Surgery for Spina bifida“ in April 2012 in Giessen, at the 15th Congress of the German Society for Prenatal Medicine and Obstetrics in May 2012 in Bonn,[87] at the World Congress of the Fetal Medicine Foundation in June 2012[88] and at the World Congress of the International Society of Obstetrics and Gynecology (ISUOG) in Copenhagen in September 2012,[89] and published in abstract form.[90][91][92][93][94][95][96][97]

Since then more data has emerged. In 2014, two papers were published on fifty one patients.[98][99] These papers suggested that the risk to the mother is small. The main risk appears to be preterm labour, on average at about 33 weeks.

See also

References

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  95. ↑ Kohl T, Kawecki A, Degenhardt J, Axt-Fliedner R. "Preoperative sonoanatomic examination of fetal spina bifida permits prediction of surgical complexity during subsequent minimally-invasive fetoscopic closure. Ultrasound Obstet Gynecol 2012;40(Suppl. 1) 8
  96. ↑ Degenhardt J, Kawecki A, Enzensberger C, Stressig R, Axt-Fliedner R, Kohl T (2012). "Rückverlagerung der Chiari-II Malformation innerhalb weniger Tage nach minimal-invasivem Patchverschluss ans Hinweis für einen effektiven Verschluss der Fehlbildung". Ultraschall in Med 33: S95.
  97. ↑ Degenhardt J, Kawecki A, Enzensberger C, Stressig R, Axt-Fliedner R, Kohl T. "Reversal of hindbrain herniation within a few days after minimally-invasive fetoscopic surgery for spina bifida indicates the desired water-tight closure of the lesion. Ultrasound Obstet Gynecol 2012;40(Suppl. 1) 74
  98. ↑ Kohl Thomas (2014). "Percutaneous minimally invasive fetoscopic surgery for spina bifida aperta. Part I: surgical technique and perioperative outcome". Ultrasound Obstet Gynecol 44: 515–524. doi:10.1002/uog.13430.
  99. ↑ Degenhardt J; et al. (2014). "Percutaneous minimal-access fetoscopic surgery for spina aperta. Part II: maternal management and outcome". Ultrasound Obstet Gynecol 44: 525–531. doi:10.1002/uog.13389.

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