MLAB 2401: Clinical Chemistry Keri Brophy-Martinez Disorders of the Adrenal Gland.
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Transcript of MLAB 2401: Clinical Chemistry Keri Brophy-Martinez Disorders of the Adrenal Gland.
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MLAB 2401: Clinical ChemistryKeri Brophy-Martinez
Disorders of the Adrenal Gland
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Addison’s Disease
• What is it?– Atrophy or destruction of adrenal cortex
(PRIMARY)• Idiopathic• Autoimmune adrenalitis• Tuberculosis
– Adrenal insufficiency (SECONDARY)• Hypothalamic/pituitary disease
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Clinical Features: Addison’s Disease
Laboratory • Decreased cortisol levels
– Both serum & urine
• Decreased aldosterone• Increased ACTH
– > 200 pg/mL
Manifestations• Increased skin pigmentation• Tiredness• Intestinal issues• Hypotension• Hypoglycemia• Hyperkalemia• Hyponatremia/hypocholoremia• Loss of body hair• Depression
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Addison’s Disease
Low Aldosterone
Increased pigment of skin
Increased MSH
Shrunken Adrenal Cortex
Increased ACTH
Low cortisol
No inhibition of ACTH
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Cushing’s Syndrome
• Caused by:– Excess glucocorticoid production
• Cortisol-secreting adrenal carcinoma or adenoma
– Prolonged exogenous steroid use• iatrogenic
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Laboratory Features
• Increased serum cortisol– Lack of diurnal variation
of cortisol
• Hyperglycemia
Sunheimer, R., & Graves, L. (2010). Clinical Laboratory Chemistry. Upper Saddle River: Pearson
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Cushing’s Syndrome
• Manifestations– Weight gain in face and
abdomen– Buffalo hump back– Muscle
wasting/weakness– Easy bruising– Hypertension– Osteoporosis– Hyperglycemia
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Conn’s Syndrome
• Caused by:– Aldosterone-secreting adrenal adenoma of
adrenal cortex (Primary)– Disorders within the renin-angiotensin system
(Secondary)
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Clinical Features: Conn’s Syndrome
Laboratory• Low serum potassium• High serum sodium• High aldosterone levels• Acid/base imbalances
Manifestations• Muscle weakness• Increased urination• Hypertension
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Adrenal Medulla Disorders
• Pheochromocytoma– Benign or malignant tumors in the adrenal
medulla– Causes hypertension
• Neuroblastoma/Ganlioneuromas– Common malignant tumors in pediatric patients
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Disorders of Sexual Development
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Testosterone
• Hyperandrogenemia– Increased testosterone production
• In females: hirsutism ( see next slide)
– Due to tumors in hypothalamus, testicles, or congenital adrenal hyperplasia
• Hypoandrogenemia– Decreased testosterone production– Due to infections, tumors, congenital disorders, or
decreased function of pituitary/ hypothalamus
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Hirsutism
• Abnormal, abundant, hair growth( lip, chin, side burn, neck)
• Loss of female sex characteristics
• Ethnic origin important– Italians, eastern
europeans, eastern Indian, Irish
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hCG & Human placental lactogen
• hCG– Increased
• Hydatidiform mole, choriocarcinoma, pre-eclamptic toxemia
– Decreased• Threatened abortion, ectopic pregnancy
• Human placental lactogen– Normal to rise throughout gestation– Decreased levels suggest placental malfunction or fetal
distress
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Estrogen
• Hyperestrinism– Overproduction of estrogen– Females
• Early puberty• Infertility & irregular menses• Postmenopausal bleeding
– Males• Testicular atrophy• Breast enlargement
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Estrogen
• Hypoestrinism– Decreased production of estrogen
• Ovarian insufficiency• Delayed puberty• Amenorrhea• Turner Syndrome
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Progesterone
• Hyperprogesteronemia– Prevents menstrual cycle
• Hypoprogesteronemia– Results in infertility– Abortion of fetus
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Menstrual Cycle Abnormalities• Average cycle is 28 days• Menopause between 45-55 years
• Amenorrhea– Absence of menses– Primary: never menstruated– Secondary: Had at least one menstrual cycle
• Oligomenorrhea– Irregular menses– Cycle length in excess of 35- 40 days
• Menorrhagia– Uterine bleeding > 7 days
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References
• Bishop, M., Fody, E., & Schoeff, l. (2010). Clinical Chemistry: Techniques, principles, Correlations. Baltimore: Wolters Kluwer Lippincott Williams & Wilkins.
• Sunheimer, R., & Graves, L. (2010). Clinical Laboratory Chemistry. Upper Saddle River: Pearson .
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