The adrenal glands are small, paired structures located just above each kidney. The outer zone of the adrenal gland (the cortex) is composed of glandular cells that manufacture and release corticosteroids. There are two types of corticosteroids: mineralocorticoids and glucocorticoids. Mineralocorticoids regulate electrolyte concentrations. Glucocorticoids reduce inflammation and suppress the immune system. Glucocorticoids are the type of corticosteroids used in nearly all steroid medications. The output of corticosteroids from the adrenal glands is controlled by the pituitary gland through the production of adrenocorticotropic hormone (ACTH).
Cushing’s syndrome is a disease caused by long-term exposure to high levels of glucocorticosteroids, either manufactured by the body or given as medications.
There are three species of hookworms that afflict dogs. These parasites are most prevalent in areas of high temperature and humidity (such as the southern United States), where conditions are favorable for the rapid development and spread of larvae.
Hookworms are small, thin worms about one-quarter to one-half inch (.6 to 1.3 cm) long. They fasten their mouth parts onto the mucosa of the small intestines and suck blood and tissue fluids from the host. This can result in severe blood loss and malnutrition...
Tumors of the pituitary gland that secrete ACTH stimulate the adrenal glands to produce large amounts of adrenal hormones. This sustained overproduction in response to pituitary stimulation accounts for 85 percent of cases of spontaneous Cushing’s syndrome. The remaining 15 percent are caused by corticosteroid-producing tumors of the adrenal glands themselves.
Spontaneous Cushing’s syndrome occurs primarily in middle-aged and older dogs, although dogs of all ages can be affected. Poodles, Boston Terriers, Dachshunds, and Boxers have the highest incidence.
A number of cases of Cushing’s syndrome are caused by long-term therapy with drugs that contain corticosteroids. This is called iatrogenic Cushing’s syndrome.
Excess cortisone can cause hair loss over the body in a symmetric pattern, with darkening of the underlying skin. The remaining hair is dry and dull. Small blackheads may be found on the abdomen. The abdomen is pendulous, distended, and pot-bellied. Other signs include lethargy with reduced activity, infertility in females, testicular atrophy and infertility in males, loss of muscle mass, and weakness. Excessive thirst and frequent urination also occur.
Dogs with hyperadrenocorticism lose body condition and develop severe problems such as hypertension, congestive heart failure, and diabetes mellitus. Other complications include increased susceptibility to infections, blood clots in the circulatory system (thromboembolism), and central nervous system signs including behavioral changes and seizures.
The diagnosis of Cushing’s syndrome is based on laboratory tests, especially those that measure serum cortisol concentrations before and after the injection of ACTH and dexamethasone. Advances in CT scans and magnetic resonance imaging (MRI)techniques have made it possible to visualize small tumors of the pituitary and adrenal glands. Ultrasound can also be used to measure the size and symmetry of the adrenal glands.