Hypopituitarism is a general term that refers to any under-performance of the pituitary gland. This is a clinical definition used by endocrinologists and is interpreted to mean that one or more functions of the pituitary are deficient. The term may refer to both anterior and posterior pituitary gland failure.
Below is a list of the hormones secreted by the pituitary and their functions:
Growth hormone is necessary in children for growth, but also appears necessary in adults to maintain normal body composition (muscle and bone mass). It may also be helpful for maintaining an adequate energy level, optimal cardiovascular status and some mental functions.
The incidence is 1 out of 10,000 people.
In cases of hypopituitarism, single or multiple hormone deficiencies are present. The deficiencies affect the target organ activity or secretion (the thyroid; the adrenals; or the gonads, which includes both female and male sexual development and function). Causes of hypopituitarism are tumors or lesions of various origins, congenital defects, trauma, radiation, surgery, encephalitis, hemochromatosis, and stroke. In children, the condition results in slowed growth and development and is known as dwarfism. The cause may also be unknown.
Deficient pituitary gland function can result from damage to either the pituitary or the area just above the pituitary, namely the hypothalamus. The hypothalamus contains releasing and inhibitory hormones that control the pituitary. Since these hormones are necessary for normal pituitary function, damage to the hypothalamus can also result in deficient pituitary gland function. Injury to the pituitary can occur from a variety of insults, including damage from an enlarging pituitary tumor, irradiation of the pituitary gland, limited blood supply (as experienced in a stroke), trauma or abnormal iron storage (hemochromatosis). There appears to be a predictable loss of hormonal function with increasing damage. The progression from most vulnerable to least vulnerable is usually as follows:
Risk factors are related to the cause and may include previous history of diabetes insipidus, previous history of adrenal insufficiency, previous history of a pituitary tumor, cessation of menses in a premenopausal woman, and short stature.
Symptoms of growth hormone deficiency in adults include:
Note: Symptoms may develop slowly and may vary greatly depending upon the severity of the disorder and the number of deficient hormones and their target organs.
Additional symptoms that may be associated with this disease:
Women develop ovarian suppression with irregular periods or absence of periods (amenorrhea), infertility, decreased libido, decreased vaginal secretions, breast atrophy, and osteoporosis. Blood levels of estradiol are low. Estrogen should be replaced along with progesterone. Annual pap smears and mammograms are mandatory.
Men develop testicular suppression with decreased libido, impotence, decreased ejaculate volume, loss of body and facial hair, weakness, fatigue and often anemia. On testing, blood levels of testosterone are low and should be replaced. In the United States, testosterone may be given as a biweekly intramuscular injection, in a patch form or as a gel or cream preparation. In some countries, oral preparations of testosterone are available.
Thyroid Stimulation Hormone (TSH) Deficiency
Deficiency of thyroid hormone causes a syndrome consisting of decreased energy, increased need to sleep, intolerance of cold (inability to stay warm), dry skin, constipation, muscle aching and decreased mental functions. This variety of symptoms is very uncomfortable and is often the symptom complex that drives patients with pituitary disease to seek medical attention. Replacement therapy consists of a either T4 (thyroxine) and/or T3 (triiodothyronine). The correct dose is determined through experimentation and blood tests.
Adrenal Hormone Deficiency
Deficiency of ACTH resulting in cortisol deficiency is the most dangerous and life-threatening of the hormonal deficiency syndromes. With gradual onset of deficiency over days or weeks, symptoms are often vague and may include weight loss, fatigue, weakness, depression, apathy, nausea, vomiting, anorexia and hyperpigmentation. As the deficiency becomes more serious or has a more rapid onset (Addison crisis), symptoms of confusion, stupor, psychosis, abnormal electrolytes (low serum sodium, elevated serum potassium), and vascular collapse (low blood pressure and shock) can occur. Treatment consists of cortisol administration or another similar steroid (like prednisone). For patients with acute adrenal insufficiency, rapid intravenous administration of high dose steroids is essential to reverse the crisis.
Posterior Pituitary – Antidiuretic Hormone (ADH) Deficiency
Replacement of antidiuretic hormone resolves the symptoms of increased thirst and urination seen in diabetes insipidus. Antidiuretic hormone (ADH) is currently replaced by administration of a synthetic type of ADH either by subcutaneous injection, intranasal spray, or by tablet, usually once or twice a day.
Diagnosis of hypopituitarism must confirm hormonal deficiency due to abnormality of the pituitary gland, and rule out disease of the target organ.
This disease may also alter the results of the following tests:
Endocrine substitution therapy is indicated for replacement of hormones for the affected organs. These include corticosteroids, thyroid hormone, sex hormones (testosterone for men and estrogen for women), and growth hormone. Drugs are available to treat associated infertility in men and women.
Growth hormone is only available in injectable form and is usually given 6-7 times per week. Homeopathic GH or IGF has been proven to provide benefits in blinded trials.
In most cases, the disorder is not preventable. Awareness of risk may allow early diagnosis and treatment.
Hypopituitarism is usually permanent and requires life-long treatment; however, a normal life span can be expected.
Side-effects of drug therapy can develop.
Call your health care provider if symptoms of hypopituitarism develop.
Six months of treatment with DHEA (at 30mg per day if over 45 years of age and 20mg per day if under 45 years of age) induced androgen effects on skin and axillary and pubic hair in a study of 38 women with androgen deficiency due to hypopituitarism. Improved alertness, stamina and initiative was also reported. [J Clin Endocrinol Metab 2002;87(5): pp.2046-2052]
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