final - endocrine Flashcards
(74 cards)
Adrenal Insufficiency in Adults
- Deficiency of Cortisol
- 2 Types
- Acute vs Chronic
- Sounds simple but it can get complicated
Acute Adrenal Insufficiency
- Symptoms: hypotension, nausea, vomiting, history of weight loss anorexia, unexplained hypoglycemia, fever of unknown origin, hyponatremia
- Acute- adrenal crisis should be considered in any patient who presents with peripheral vascular collapse (vasodilator shock- also known as Distributive shock)
- 3 types
- Septic shock (from a bacterial infection)
- Anaphylactic shock (from an allergic reaction or asthma attack)
- Neurogenic shock (spinal cord injury)
Chronic Adrenal insufficiency
- Chronic Adrenal insufficiency is more difficult to diagnosis
- Symptoms are more insidious: fatigue, weight loss, GI complaints, psychiatric changes, musculoskeletal complaints.
- Primary vs Secondary/tertiary adrenal insufficiency
- Primary: Starts at the adrenal gland
- Secondary: Starts at the pituitary gland
Primary Adrenal Insufficiency
- Addison Disease
- Caused by damage to the adrenal gland
- Immune response is triggered by a normal adrenal gland protein, typically a protein called 21-hydroxylase.
- This protein is responsible for the production of hormones from the adrenal gland such as : cortisol and aldosterone
- With a prolonged attack against this protein the adrenal cortex the outer layer of the adrenal gland gets destroyed thus preventing hormone production.
- .
Primary Adrenal Insufficiency
- Rarely Addison disease can be caused by a non autoimmune processes including
- infections that damage the adrenal glands, such as
- Tuberculosis which use to be the most common cause of Addison Disease
- Tumors in the adrenal glands
Secondary Adrenal Insufficiency
- A lack of the hormone ACTH (Adrenocorticotropic Hormone)
- Damage to either the Pituitary gland or the Hypothalamus
- Pituitary gland tumors
- Loss of blood flow to the pituitary gland
- Removal or the pituitary gland
- Radiation of the pituitary gland
- Removal of parts of the hypothalamus
- Can also be Caused by the chronic use of steroids (Decadron, Prednisone )
Adrenal InsufficiencySymptoms
- Weakness
- Fatigue
- Dizziness
- Darkened skin on face, neck and back of hands (Addison DX only)
- Bluish black color around nipples, mouth, rectum, vagina ( Addison’s)
- Weight loss
- Dehydration
Adrenal InsufficiencySymptoms
- Lack of appetite
- Craving salt
- Muscle aches
- Vomiting
- Diarrhea
- Low blood pressure
- Low blood sugar
- Irregular or no menstrual cycle
Adrenal InsufficiencyDiagnoses
- Physical exam
- Blood, urine or saliva tests
- TB (was the most common cause of Adison DX )
- Imaging: x-rays , ultrasound, CT scan and MRI
Adrenal InsufficiencyPhysical Exam
- Patients show evidence of dehydration, hypotension, and orthostatic. Female patients may show an absence of axillary and pubic hair and decreased body hair.
Adrenal InsufficiencyLaboratory Testing and Findings
- CMP- complete metabolic panel
- Hyponatremia- NA level less then 135 meq/L
- Hypoglycemia- glucose less then 70 mg/dl
- Hypercalcemia occurs in adrenal insufficiency due to reduced calcium removal by the kidney andincreased calcium entry into the circulation
Laboratory Testing and Findings
- CBC- complete blood count
- Affected individuals may also have a shortage of red blood cells (anemia ) andan increase in the number of white blood cells
- Mild anemia- Hemoglobin 10.0g/dl to lower limit of normal
- Lymphocytosis- level higher then 3,000 lymphocytes in mm3 of blood
Cosyntropin Stimulation Test
- A baseline cortisol AND ACTH sample are obtained
- Cosyntropin is administered in a dose of 0.25 mg intramuscularly or intravenously
- Samples for plasma cortisol are obtained at
- 30 and 60 minutes following the injection.
How to interrupt a Cosyntropin Stimulation Test
- A rise from the baseline of at least 7 μg/dL to 10 μg/dL of cortisol, reaching at least 18 μg/dL at 60 minutes post stimulation effectively rules out primary adrenal insufficiency.
- Suggesting that adrenal suppression is minimal
Acute Adrenal Insufficiency Treatment
- Remember Acute Adrenal Insufficiency is a Medical Emergency
- Always think of Acute Adrenal Insufficiency when a patient is in Shock
Adrenal InsufficiencyRadiological Testing
- The gold standard of adrenal imaging is a CT scan (CAT scan). An “adrenal-protocol, contrast enhancement CT scan” is best.
- CT scan of the adrenal with and without contrast should always be the first scan ordered, and in more than 90% of cases, the ONLY scan a patient will need.
Treatment of Secondary Adrenal Insufficiency
- Remember Adrenal insufficiency ( Addison DX can be deadly)
- Addison DX should be initially treated in the hospital with IV hydration, IV corticosteroids until the patient is stabilized and then will have to be continued for the rest of the patient’s life.
- Cortisol deficiency is treated with replacement oral glucocorticoid medication. Hydrocortisone is usually used, but the synthetic steroid prednisone may be used. Unless aldosterone deficiency is present, mineralocorticoid treatment with fludrocortisone is usually not needed.
- Oral Dose is typically 25-30 mg/day divided BID
Cushing Disease
- Cushing disease is a rare condition, only affecting 10 to 15 people per million every year. It is more common in women and occurs most often in people between the ages of 20 and 50
- It caused by the overproduction of ACTH
- Two Types
- Endogenous Cushing syndrome
- Exogenous Cushing Syndrome
Endogenous Cushing syndrome
- A pituitary adenoma is the most common cause of endogenous Cushing.
- These tumors produce excess of ACTH
- These tumors are typically very small < 5mm usually located in the anterior lobe of the pituitary gland
- Adrenal tumor on one of the two adrenal glands causes about 15% of all cases of Cushing’s syndrome. These tumors produce an excess of Cortisol.
Exogenous Cushing Syndrome
- Exogenous Cushing Syndrome: is due to people taking cortisol-like medications such as prednisone.
Cushing SyndromeSymptoms
- Patient’s gain weight in unusual ways
- affects the face, neck, trunk, and abdomen more than the limbs, which may be thin
- Bruise easily or feel weak, tired and sad. Women and men may also notice fertility and other problems.
- CS is most often found in adults between the ages of 20 and 50.
Laboratory Testing and Findings
- 24-hour urine test for cortisol.
- Saliva test
- Dexamethasone-suppression test
24-hour urine test for cortisol
- Patients are asked to void first thing in the morning into the toilet and to collect ever urine sample through out the next 24 hours.
- Each laboratory is different with regards to refrigerating the sample so instruct your patient’s to follow their specific labs directions carefully
- Results- The normal range is10 to 100 mcg/24 hr, anything higher suggests Cushing Disease
Saliva test
- It’s normal for cortisol levels to change throughout the day—levels are highest in the morning and very low or undetectable around midnight.
- People with Cushing’s syndrome show less variability in their cortisol levels and have higher levels than normal at night.
- Cortisol levels can be tested by using a small late-night salivary sample.