Prader-Willi syndrome (patient information)

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What is Prader-Willi syndrome?

Prader-Willi syndrome is a congenital (present from birth) disease that involves obesity, decreased muscle tone, decreased mental capacity, and sex glands that produce little or no hormones.

What are the symptoms of Prader-Willi syndrome?

Symptoms may include:

  • Almond-shaped eyes
  • Delayed motor development
  • Floppy newborn infant
  • Insatiable appetite, food craving
  • Irregular areas of skin that look like bands, stripes, or lines
  • Narrow bifrontal skull
  • Rapid weight gain
  • Skeletal (limb) abnormalities
  • Slow mental development
  • Small for gestational age
  • Undescended testicles in the male infant
  • Very small hands and feet in comparison to body

Affected children have an intense craving for food and will do almost anything to get it. This results in uncontrollable weight gain and morbid obesity. Morbid obesity may lead to lung failure with low blood oxygen levels, right-sided heart failure, and death.

What causes Prader-Willi syndrome?

Prader-Willi syndrome is caused by a gene missing on part of chromosome 15. Normally, your parents each pass down a copy of this chromosome. Most patients with Prader-Willi syndrome are missing the genetic material on part of the father's chromosome. The remaining patients frequently have two copies of the mother's chromosome 15.

Who is at risk for Prader-Willi syndrome?

The genetic changes occur randomly. Patients usually do not have a family history of the condition.

How do I know I have Prader-Willi syndrome?

Signs of Prader-Willi syndrome may be seen at birth. Newborns with the condition are often small and very floppy. Male infants may have undescended testicles.

As the child grows older, laboratory tests may show signs related to morbid obesity, such as:

  • Above normal level of insulin in the blood

There may also be signs of right side heart failure and knee and hip problems.

When to seek urgent medical care

Call your health care provider if your child has symptoms of this condition. The disorder is frequently suspected at birth.

Treatment options

Obesity represents the greatest problem to health. Limiting caloric intake will control the obesity but the family, neighbors, school, and other institutions must cooperate closely as the child will attempt to obtain food wherever possible. Exercise can increase lean body mass in children with Prader-Willi syndrome.

Growth hormone has also been shown to improve physical strength and agility in patients with Prader-Willi syndrome. There have been some concerns regarding the effect of GH on lung function in children with this condition. Parents should discuss the possible side effects with the child's doctor.

A very small penis in the male infant may be corrected with testosterone.

Low levels of sex hormones may be corrected at puberty with hormone replacement.

Where to find medical care for Prader-Willi syndrome

Directions to Hospitals Treating Prader-Willi syndrome

Prevention of Prader-Willi syndrome

There is no medical prevention for Prader-Willi syndrome.[1]

What to expect (Outlook/Prognosis)

Appropriate education will be needed for the affected person's IQ level. Weight control will allow for a much more comfortable and healthful life.

Possible complications

  • Diabetes
  • Right-sided heart failure
  • Orthopedic problems

Sources

http://www.nlm.nih.gov/medlineplus/ency/article/001605.htm

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