Autoimmune polyendocrine syndrome type 2

Autoimmune polyendocrine syndrome type 2
	File:HLA-DQ2.5 gliadin.PNG
Synonyms	Schmidt syndrome
Pronounce	N/A
Specialty	N/A
Symptoms	Adrenal insufficiency, hypothyroidism, type 1 diabetes
Complications	Addisonian crisis, myxedema coma, diabetic ketoacidosis
Onset	Typically in adulthood
Duration	Chronic
Types	N/A
Causes	Autoimmune disease
Risks	Genetic predisposition, HLA-DR3, HLA-DR4
Diagnosis	Clinical evaluation, blood tests for hormone levels, autoantibody testing
Differential diagnosis	Autoimmune polyendocrine syndrome type 1, isolated autoimmune conditions
Prevention	N/A
Treatment	Hormone replacement therapy, immunosuppressive drugs
Medication	Hydrocortisone, levothyroxine, insulin
Prognosis	Variable, depends on management of individual conditions
Frequency	Rare
Deaths	N/A

Editor-In-Chief: Prab R Tumpati, MD
Obesity, Sleep & Internal medicine
Founder, WikiMD Wellnesspedia &
W8MD's weight loss doctor NYC
Philadelphia GLP-1 weight loss and GLP-1 clinic NYC

Autoimmune Polyendocrine Syndrome Type 2 (APS-2), also known as Schmidt's syndrome, is a complex autoimmune disorder characterized by the coexistence of at least two autoimmune diseases, including Addison's disease, thyroid autoimmune diseases (such as Graves' disease or Hashimoto's thyroiditis), and type 1 diabetes mellitus. This syndrome is more common in females and typically presents in adulthood.

Etiology and Pathogenesis[edit]

The exact cause of APS-2 is unknown, but it is believed to involve a combination of genetic predisposition and environmental factors. The HLA-DQ gene is often associated with the syndrome, suggesting a strong genetic component. Environmental triggers may include viral infections, stress, and other unknown factors that initiate an autoimmune response in genetically susceptible individuals.

Clinical Manifestations[edit]

APS-2 presents with a variety of symptoms depending on the specific autoimmune diseases involved. Common manifestations include:

Addison's disease symptoms: fatigue, weight loss, skin hyperpigmentation, low blood pressure, and salt craving.
Thyroid autoimmune diseases symptoms: depending on whether the patient has Graves' disease (hyperthyroidism) or Hashimoto's thyroiditis (hypothyroidism), symptoms can include weight changes, mood swings, heat or cold intolerance, and changes in heart rate.
Type 1 diabetes mellitus symptoms: increased thirst and urination, weight loss, fatigue, and blurred vision.

Diagnosis[edit]

Diagnosis of APS-2 involves a combination of clinical evaluation and laboratory tests. Key diagnostic tests include:

Autoantibody tests: to detect antibodies against the adrenal cortex, thyroid, and pancreatic islet cells.
Hormone level tests: to assess the function of the affected glands (e.g., cortisol, thyroid hormones, and insulin).
Imaging studies: such as ultrasound or CT scans, may be used to evaluate the structure of the thyroid gland and adrenal glands.

Treatment[edit]

Treatment of APS-2 focuses on managing the symptoms of the individual autoimmune diseases involved and may require a multidisciplinary approach. Common treatments include:

Corticosteroids: for Addison's disease to replace the deficient hormones.
Thyroid hormone replacement therapy: for Hashimoto's thyroiditis.
Antithyroid drugs or radioactive iodine therapy: for Graves' disease.
Insulin therapy: for type 1 diabetes mellitus.

Regular monitoring and adjustments of therapy are essential due to the progressive nature of these autoimmune diseases.

Prognosis[edit]

With appropriate treatment and monitoring, individuals with APS-2 can manage their symptoms and maintain a relatively normal quality of life. However, they must remain vigilant for the development of additional autoimmune diseases.

Epidemiology[edit]

APS-2 is less common than Autoimmune Polyendocrine Syndrome Type 1 (APS-1) but is more prevalent in certain populations, particularly those of Northern European descent. It typically presents in adulthood, with a higher incidence in females.