About Growth Hormone Deficiency
Growth hormone deficiency (GHD) can be caused by various factors. One of the main causes is the presence of a brain tumor, particularly in childhood cancer survivors. Tumors located near the hypothalamus or pituitary gland can disrupt growth hormone production, and treatments such as neurosurgery, cranial radiation, and certain chemotherapy agents can further contribute to GHD. Radiation therapy, in particular, is an independent risk factor, with the risk increasing as radiation doses to the hypothalamic-pituitary axis (which regulates growth hormone production) becomes higher.
Other risk factors:
- Age and hormonal changes: Growth hormone levels naturally decrease as people age, starting around age 35. GHD become more common during this time and tends to stabilize around age 55.
- Family medical history: A family history of certain medical conditions, such as pituitary disorders, can increase the risk of developing GHD.
The most common early symptoms of growth hormone deficiency (GHD) in children include:
- A slow growth rate and underdeveloped facial bones
- These children may also be shorter than their peers.
- In some cases, they may look much younger than other children their age and have a chubby body shape due to extra fat around their stomach
- They may also have thin or slow-growing hair and delayed puberty.
As GHD progresses or becomes more severe, other common symptoms may occur.
- In adults, unexplained decreases in muscle mass and low energy levels are often noticed.
- Children and adults with GHD may also experience:
- Fatigue
- Weakness
- Headaches
- Visual disturbances
- Sleep disturbances
- Difficulty with planning, focus, memory, and emotional control
- Confusion
However, it's important to note that not all individuals with GHD will experience the same symptoms, and some individuals may not have any specific symptoms at all.
It's worth mentioning that the symptoms of GHD can vary depending on the age at which it presents. Most people tend to receive a diagnosis of GHD during childhood, but it can also be acquired during adulthood. In both children and adults, a doctor will typically treat GHD with injections of growth hormone to help alleviate the symptoms and improve overall well-being.
To diagnose growth hormone deficiency (GHD), there are several examinations, tests, and procedures that are commonly performed. These include:
- Growth hormone stimulation test: This is the recommended method for evaluating growth hormone levels in children with possible GHD. During this test, the child is given a substance that stimulates the release of growth hormone, and their blood is then tested to measure the levels of growth hormone.
- Nocturnal spontaneous growth hormone secretion: In addition to the stimulation test, healthcare professionals may measure growth hormone levels released naturally during sleep. This test involves taking several measurements of growth hormone levels while you are asleep.
- Blood hormone levels: Blood tests may be done to measure other hormones such as thyroid-stimulating hormone (TSH), free thyroxine (T4), cortisol, prolactin, and insulin-like growth factor-1 (IGF-1). These tests can help determine if there are any abnormalities in hormone levels that may be contributing to GHD.
To determine the stage or severity of GHD, additional examinations, tests, and procedures may be performed. These can include:
- Bone age estimation: An X-ray of the hand is taken to check bone age by analyzing the bones’ development. This can determine if there is a delay in bone growth, which may suggest GHD.
- Stimulation testing: In some cases, additional stimulation tests may be done to check growth hormone levels more closely. These tests are sometimes used to diagnose GHD in adults. For example:
- Insulin tolerance test (ITT): This test lowers your blood sugar using insulin to see if it triggers the release of growth hormone. Low levels of growth hormone in response may indicate GHD.
- Growth hormone-releasing hormone (GHRH) + arginine test: This test uses medications to encourage the body to produce growth hormone. If growth hormone levels stay low, it could suggest GHD.
- Hormonal testing: Other hormonal tests may be done to check how well the pituitary axes are working. These axes are pathways controlled by the pituitary gland that regulate important body functions. This can involve measuring levels of hormones such as TSH, testosterone or estradiol, cortisol, and prolactin. These tests help identify if there are any issues in the systems the pituitary gland controls.
It's important to note that these examinations, tests, and procedures should be conducted by healthcare professionals who specialize in endocrinology or pediatric endocrinology. They will interpret the results and make an accurate diagnosis based on the findings.
The goals of treatment for growth hormone deficiency (GHD) are to improve growth rate in the short term and to optimize final height in the long term. Additionally, treatment aims to improve cardiac function, skeletal structure, body composition, and overall quality of life.
- The main medication used for GHD is recombinant human growth hormone (rhGH), also known as somatropin. It is administered through subcutaneous injections. The dose typically ranges from 0.025-0.1 mg/kg/day and is given six or seven days per week until the individual achieves their final adult height. RhGH works by replacing the deficient growth hormone and stimulating growth in children and adolescents with GHD.
In addition to medication, there are other therapeutic procedures and lifestyle behavior changes that can support the treatment of GHD. These include:
- Regular monitoring: Patients undergoing growth hormone treatment undergo regular monitoring to assess the safety and effectiveness of the hormone. This helps healthcare providers adjust the treatment plan as needed.
- Healthy lifestyle habits: Adopting a healthy lifestyle can complement growth hormone treatment. This includes maintaining a balanced diet, engaging in regular physical activity, and getting enough sleep. These lifestyle changes support overall growth and development.
- Bone density and muscle mass improvement: Growth hormone treatment can help improve bone density and increase muscle mass in individuals with GHD. This can enhance overall body development and shape.
- Reduction of body fat: Growth hormone treatment has been shown to reduce total body fat, especially around the belly area. This can contribute to a healthier body composition.
- Improvement in exercise capacity: Growth hormone treatment can increase exercise capacity, allowing individuals with GHD to engage in physical activities more effectively.
- Reduction of cardiovascular risk: Lack of growth hormone is associated with an increased risk of cardiovascular diseases. Growth hormone treatment helps reduce this risk by improving lipid metabolism and cardiovascular function.
Overall, the goals of treatment for GHD are to optimize growth potential, improve body composition, enhance cardiac function, and improve overall quality of life. Medication such as recombinant human growth hormone is used alongside therapeutic procedures, lifestyle behavior changes, and regular monitoring to achieve these goals.
Medication dosing may be affected by many factors. Check with your health care professional about dosing for your individual situation. Side effects can occur. Check with your health care professional or read the information provided with your medication for side effect information.
The natural progression of growth hormone deficiency (GHD) can vary depending on the underlying cause and individual factors. In some cases, GHD may remain stable or progress slowly over time, while in others, it may worsen.
Complications of GHD commonly occur and can affect various aspects of health. One of the most noticeable complications is impaired growth in children. Without enough growth hormone, children may grow more slowly and be shorter than their peers. In addition to physical effects, GHD can also impact mental and emotional well-being in both children and adults. Children with GHD may experience a sense of being different from their peers, which can affect their self-esteem and social interactions.
In adults, the complications of GHD can include increased fat around the waist, reduced muscle mass and strength, weak bones, fatigue, and a reduced ability to think clearly. Adults with GHD may also be at an increased risk of heart disease and stroke.
Treatment for GHD aims to address the underlying hormone deficiency and improve overall health outcomes. The primary treatment approach is hormone replacement therapy using synthetic growth hormone (recombinant human GH). This treatment helps to replace the missing growth hormone and can lead to improved growth in children with GHD. In adults, hormone replacement therapy can help reduce symptoms such as fatigue, increase muscle mass, improve bone density, and enhance overall quality of life.
It's important to note that treatment for GHD should be individualized and monitored by a healthcare professional experienced in managing hormone deficiencies. They will assess the specific needs of each person and determine the appropriate dosage and duration of treatment.
It's also worth mentioning that while treatment for GHD can provide significant benefits, it may not completely cure the condition or reverse all complications. The impact of treatment varies depending on factors such as age, overall health status, adherence to treatment, and response to therapy.
In summary, the natural progression of GHD can vary among individuals. Complications commonly associated with GHD include impaired growth in children and various physical and psychosocial effects in both children and adults. Treatment with synthetic growth hormone aims to address these deficiencies and improve overall health outcomes by promoting growth in children and addressing symptoms in adults. However, it's important to consult with a healthcare professional for personalized guidance regarding treatment options for GHD.