Exogenous Cushing's syndrome

Exogenous Cushing's syndrome is a condition caused by excessive exogenous (outside the body) production of corticosteroids, most often glucocorticoids. It can develop as a result of long-term or active use of drugs containing cortisol or its derivatives for the treatment of various diseases, such as inflammatory and autoimmune disorders. Symptoms of exogenous Cushing's syndrome include such manifestations as obesity with a characteristic distribution of fat (especially in the abdominal and facial areas), hypertension, diabetes, osteoporosis, and psychoemotional disorders such as depression or mood changes. This disease requires complex diagnostics and treatment, as it can significantly reduce the quality of life and lead to serious complications.

History of the disease and interesting historical facts

The history of Cushing's syndrome dates back to the first half of the 20th century, when in 1932, the American physician Harry Cushing, who specialized in neurosurgery, became the first to describe this disease based on clinical observations. Cushing associated his observations with the presence of pituitary adenomas, which later became the basis for a more in-depth study of the causes and mechanisms of pathology development. In his works, terms were proposed that are still used in medical practice. An interesting fact is that Cushing's syndrome was known for many years as "primary hypercorticism", but thanks to extensive research in the field of endocrinology, the emphasis shifted to distinguishing between exogenous and endogenous Cushing's syndrome, which made it possible to more accurately classify the disease and develop effective treatment methods.

Epidemiology

The epidemiology of exogenous Cushing's syndrome is characterized by uneven distribution among different population groups. According to the latest epidemiological study, the prevalence of exogenous Cushing's syndrome ranges from 5 to 30 cases per 100,000 population per year, and the incidence is higher in women than in men by a ratio of 3:1. The main risk factor is the use of corticosteroids, which is unified among various diseases, including rheumatoid arthritis, asthma, and skin diseases. Given the growing popularity of corticosteroids for both systemic diseases and aesthetic procedures, the incidence of this syndrome is expected to increase in the coming years.

Genetic predisposition to this disease

To date, no genetic predisposition to exogenous Cushing's syndrome has been identified, as this condition is primarily associated with external influences in the form of corticosteroid use. However, it should be noted that some patients with a hereditary predisposition to endogenous pituitary dysfunction, such as Manger's syndrome or pheochromocytomas, have an increased risk of developing endogenous Cushing's syndrome, which may indirectly increase the likelihood of the exogenous form due to the need for corticosteroid treatment.

Risk factors for the development of this disease

When considering the risk factors for the development of exogenous Cushing's syndrome, the following can be identified:

• Long-term use of corticosteroid drugs to treat conditions such as asthma, allergic reactions, autoimmune diseases.
• High doses of corticosteroids, which are often used in patients with severe forms of the disease.
• Certain diseases require the use of long-term corticosteroids.
• Concomitant use of several drugs containing corticosteroids may result in exceeding the safe dose.
• Long-term use of corticosteroids for chronic diseases without medical supervision and control.

Diagnosis of this disease

Diagnosis of exogenous Cushing's syndrome involves several key components. The main symptoms observed in patients include:

• Obesity with a characteristic distribution of fat (fat deposits on the abdomen and face).
• Hypertension and carbohydrate metabolism disorders (insulin resistance, diabetes).
• Skin changes: acne, stretch marks, hyperpigmentation.
• Psychoemotional disorders: anxiety, depression.
• Muscle weakness and osteoporosis.

Laboratory tests may include blood and salivary cortisol levels and 24-hour urinary cortisol excretion to help confirm excess production of the hormone. Radiologic tests may include MRI or CT to rule out pituitary or adrenal tumors. Differential diagnosis with endogenous forms of Cushing's syndrome is also important in identifying the source of the problem.

Treatment

Treatment of exogenous Cushing's syndrome should be comprehensive and individualized. The main goal of treatment is to reduce the level of corticosteroids in the body. This may include:

• Gradually reduce the dose of corticosteroids under the supervision of a physician to avoid withdrawal syndrome.
• Replace corticosteroids with less potent drugs, if possible.
• Use of drugs that reduce the effect of corticosteroids, such as mifepristone.
• Surgery may be considered if there are tumors or other underlying causes that require surgical removal.
• Pharmacological treatment aimed at compensating for side effects, such as antihypertensive drugs to control blood pressure and drugs to treat osteoporosis.

List of medications used to treat this disease

The main groups of drugs used to treat exogenous Cushing's syndrome include:

• Corticosteroids: hydrocortisone, prednisolone.
• Antihypertensive drugs: ACE inhibitors, beta-blockers.
• Drugs for the treatment of osteoporosis: bisphosphonates, vitamin D.
• Mifepristone – used to treat severe cases.
• Blood sugar control drugs: metformin.

Disease monitoring

Monitoring of exogenous Cushing's syndrome should be performed on a regular basis both to assess the effectiveness of treatment and to identify possible complications. Monitoring steps include:

• Regular assessment of cortisol levels in the blood and saliva.
• Monitoring blood pressure, glucose levels and bone health.
• Assessment of the patient’s psycho-emotional state and the possibility of therapeutic correction.
• The prognosis for this disease is generally quite favorable, provided that adequate treatment is provided in a timely manner; however, complications such as osteoporosis and cardiovascular diseases may arise.

Age-related features of the disease

Age-related features of exogenous Cushing's syndrome show that the disease can manifest itself at any age, but is more often diagnosed in adult women. In children, the syndrome can develop as a result of long-term use of corticosteroids in the treatment of asthma or other diseases, which requires special attention from the attending physicians. In older people, as a rule, more pronounced complications are observed due to concomitant diseases, such as osteoporosis and cardiovascular diseases, which complicates diagnosis and treatment.

Questions and Answers

• What are the main symptoms of exogenous Cushing's syndrome?
  The main symptoms include obesity with a characteristic distribution of fat deposits, hypertension, changes in metabolism (insulin resistance), disturbances of the psycho-emotional state and osteoporosis.
• How is exogenous Cushing's syndrome diagnosed?
  Diagnosis includes clinical examination, laboratory tests for cortisol levels, radiological methods (MRI, CT) and differential diagnosis with other variants of Cushing's syndrome.
• What is the main cause of exogenous Cushing's syndrome?
  Exogenous Cushing's syndrome results from prolonged and/or excessive use of corticosteroids to treat various diseases.
• How is exogenous Cushing's syndrome treated?
  Treatment involves tapering the dose of corticosteroids, replacing them with less potent drugs, pharmacological support and, in some cases, surgical intervention.
• How are patients with exogenous Cushing's syndrome monitored?
  Monitoring includes regular assessment of cortisol levels, control of blood pressure and glucose levels, as well as assessment of the patient’s bone tissue condition and psycho-emotional health.

Advice from Dr. Oleg Korzhikov

As Dr. Oleg Korzhikov notes, an important aspect in the treatment of exogenous Cushing's syndrome is following the doctor's recommendations and monitoring the state of health. He emphasizes that patients should not independently change the dose of corticosteroids or stop taking them without consulting a specialist. In the event of new symptoms, it is necessary to immediately contact a doctor. It is also worth paying special attention to lifestyle correction: sports activity, a balanced diet and an adequate level of stress will help improve overall health. Dr. Korzhikov recommends regular examinations and talking to a doctor about your concerns, since early diagnosis and timely intervention are key factors for successful treatment.