Adrenal disease Dr. bandar - PowerPoint Presentation

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Adrenal disease

Dr.

bandar

ghazal

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Each Adrenal gland lie superior to each kidney .

Pyramidal in shape .

3- 5 cm in height , 3 cm in width , less than 1 cm thick

Mass 3.5 - 5 g

Gland differentiate in two distinct regions

large ( 80 % ) cortex ( mesoderm )

Small ( 20 % )medulla (ectoderm )

Capsule covering the gland

Highly vascularized structure .

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Adrenal hormones

Zona Glomerulosa : mineralocorticoids

Major : ALDOSTERONE

Regulate blood volume , pressure , NA and K .

Also promote H excretion in urine .

Aldosterone secretion stimulated by renin- angiotensin- aldosterone pathway .

And to lesser extent by ACTH .

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Zona Fasciculata: glucocorticoids

Cortisol (hydrocortisone ) account for 95 %

Cortisone ,

Corticosterone

CRH

corticotropin releasing hormone promote secretion of ACTH (adrenocorticotropic hormone)Function of corticosteroids :Protein breakdown : increase amino acid in blood Glucose formation : gluconeogenesis Lipolysis : breakdown triglycerides Resistance of stress Makes blood vessel sensitive to other hormone causing vasoconstriction such increase BPAnti inflammatory , alteration of wound healing Depression of immune system .

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Glucocorticoid: -cortisol level are highest in the morning and lowest in the middle of the night ( diurnal rhythm )

cortisol rises dramatically during stress (

e.x:illness

, starvation)

Most of cortisol circulates in blood attached to cortisol binding

protein

, with small amount circulate as biologically active free hormone .Zona reticularis : produce small amount of androgen .DHEA ( dehydroepiandrosterone )Weak androgen with peripheral conversion to testosterone .

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Cushings syndrome

Excessive activation of glucocorticoid receptors. ( syndrome ) regardless the cause .

Exogenous- Prolonged administration of Prednisolone.

2. Endogenous.

Cushing disease : endogenous high cortisol due to high ACTH from pituitary tumor

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ACTH-dependent

:

• Pituitary adenoma secreting ACTH (Cushing's disease)

• Ectopic ACTH syndrome (bronchial carcinoid, small-cell lung carcinoma, other

neuro-endocrine tumor) Non-ACTH-dependent :• Adrenal adenoma • Adrenal carcinoma • ACTH-independent macronodular hyperplasia; primary pigmented nodular adrenal disease .

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Signs and symptoms

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Striae

:especially reddish > 1 cm width

Easy bruising

Facial plethora

Dorsocervical

and supraclavicular fat pads .

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Initial testing

1)Urine free cortisol: 24-hr timed collection, elevated if above

reference

range for assay

2)late night salivary cortisol 11 pm – 12 pm at least 2 different nights

Loss of diurnal rhythm .

3)overnight dexamethasone suppression test: 1 mg orally at 11 pm, measure plasma cortisol at 8:00 am (<50 nmol/l ) exclude cushing syndrome . >138nmol/l considered positive When suspicion of cushing is low , single test if negative makes cushing syndrome is unlikely .When suspicion of cushing is high ???Two different test are recommended

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Pseudo

cushings

:

Occur with major depression , anxiety , psychosis ,

poorly

controlled DM and sever visceral obesity

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Confirmatory test

1)Low

dose

dexamethason

suppression test: Serum cortisol is measured following administration of 0.5 mg 6-hourly for 48 hour (<50

nmol

/l ) exclude Cushing syndrome 2)High dose dexamethasone suppression test: Serum cortisol is measured following administration of 2 mg 6-hourly for 48 hour3)Measuring plasma ACTH:<1.1 pmol/L ACTH-independent cause > 3.3 pmol\L ACTH-dependant cause

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Adrenal CT scan or MRI

Pituitary MRI

In case of ACTH dependent

If no tumor , or if tumor is less than 6 mm

High dose dexamethasone suppression test to evaluate for ectopic ACTH

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Management

• Most patients are treated surgically, but medical therapy may be given in severe cases for a few weeks prior to operation to improve the clinical state. A number of drugs are used to inhibit corticosteroid

biosynthesis, including

metyrapone

and ketoconazole.

• If the patient have

cushing disease --- transphenoidal surgery

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hyperaldosteronism

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PATHOPHYSIOLOGY

Stimuli

of aldosterone secretion

:

1- angiotensin II ( the principal stimulus

) . 2- increased K+ .3. decreased volume .4. lesser extent by ACTH .suppressors of aldosterone secretion : 1- hypervolemia 2- hypokalemia

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RAAS ( RENIN ANGIOTENSIN ALDOSTERONE SYSTEM)

Renin : a

proteolytic

enzyme , released by the kidneys , in which the primary site of it’s storage and release is the JGA

.

It’s release is stimulated by : 1- sympathetic activation .2- renal artery hypo perfusion 3- decreased Na delivery to the distal tubules

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PRIMARY HYPERALDOSTERONISM

-Increased mineralocorticoid secretion from the adrenal cortex .

-

Low renin levels but high

aldosterone levels

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Etiology

Idiopathic bilateral adrenal hyperplasia .

Tow third of cases

-

Adrenal adenoma secreting aldosterone (Conn’s syndrome)

.

One third of cases

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hypertension

.

hypokalemia ,muscle weakness or even paralysis

. ( 40 % )

Hypernatremia

.Excess thirst , polyuria due low K level Higher cardiovascular mortality and morbidity noted in primary hyperaldosteronism compared to PT with essential HTN with similar BP .

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PA ???

HTN > 140 /90 on three drug therapy

HTN with spontaneous hypokalemia or diuretic induce hypokalemia.

Untreated HTN with sustained BP >150 /100

HTN with incidental adrenal mass

HTN in setting of first degree relative with PA .

HTN in setting of family history of HTN onset age < 40.

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Investigations

Biochemical

–

Routine

blood tests

-

Aldosterone: renin ratio ( ARR ) Mid morning seated sample If pt taking ACEI ,ARBS , spironolactone ?? An ARR greater than 20 with plasma aldosterone concentration of at least 15 ng / dl is considered a positive test confirmatory test : suppression tests ( normal saline , fludrocortisone ,NaCl tabs )Infuse 2 liter 0.9% over 4 hours or 10 -12 g daily of NACL tab for 3 days Blood level : plasma aldosterone >5ng /dl confirm diagnosis Hr urine collection for aldosterone , creatinine and NA Aldosterone in urine >10 microg/24 hr confirm diagnosis

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Adrenal CT :

Result :

NL

Hyperplasia

Unilateral or bilateral adenoma

Incidental adrenal mass may or may not related to primary

aldosteronism Adrenal vein sampling to measure aldosterone .

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Management

- Mineralocorticoid receptor antagonist ( spironolactone , eplerenone ) for hypertension and

hypokalemia

other anti HTN medications .

For unilateral disease :

Laparoscopic adrenalectomy 40 % of PT cured after surgery others BP significantly improve .Persistent HTN after surgery may occur due to primary HTN or due to vascular changes caused by HTN .

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SECONDARY HYPERALDOSTERONISM

• high renin and aldosterone levels

.

Etiology :

1-

Inadequate renal perfusion ( HF , RA stenosis , diuretic therapy ) 2- renin-secreting renal tumor ( very rare)

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Adrenal insufficiency

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-It results from inadequate secretion of cortisol and/or aldosterone

.

PRIMARY

Endogenous Failure of adrenal gland to secret hormones

Presence of hyperpigmentation due to stimulation of melanocytes by high ACTH .

SECONDARY

most common cause and its due to ACTH deficiency usually due to inappropriate steroids withdrawal , or pituitary tumor ADRENAL CRISIS Potentially fatal and variable in its presentation , usually precipitated by acute illness or replacement of thyroid hormone in un recognized chronic adrenal insufficiency

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Causes of adrenal insufficiency

Primary adrenal insufficiency (High ACTH

)

1-Addison’s disease

Autoimmune .( most common ) destruction of all 3 layers , most

pt

have positive 21 – hydroxylase antibodies . 50 % of these pt may develop autoimmune endocrine disorder (primary hypothyrodism , celiac disease type 1 DM , hypoparathyrodism )2-Other causes : TB , fungal infection HIV/AIDSSarcoidosis , hemochromatosis Metastatic carcinoma ( lung cancer , renal cell cancer ) lymphoma Bilateral adrenal hemorrhage, sepsis and DIC , anticoagulation protein C deficiency .

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2- Corticosteroid biosynthetic enzyme defects

–

- Congenital

adrenal

hyperplasia's.

21 hydroxylase deficiency

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Secondary adrenal insufficiency (Low ACTH

):

-sudden Withdrawal

of glucocorticoids

therapy

. -Hypothalamic or pituitary disease.

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CLINICAL ASSESSMENT

In

addison’s

disease, either glucocorticoid or mineralocorticoid deficiency might come first, but eventually all patients fail to secrete both.

Patients

may present with chronic features (weakness, fatigue and hyperpigmentation) and/or in acute circulatory shock.

These symptoms are often misdiagnosed as chronic fatigue syndrome or depression. Adrenocortical insufficiency should be considered in patients with hyponatremia even in the absence of symptoms.

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CLINICAL

FEATURES in primary disease

(SYMPTOMS CAUSED BY GLUCOCORTICOID INSUFFICIENCY)

Weight

loss

Anorexia fatigueNausea and vomiting Diarrhoea or constipation Postural hypotension Shock .Hyponatremia .hypoglycemia

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ADDISON’S DISEASE CLINICAL FEATURES (CAUSED BY MINERALOCORTICOID INSUFFICIENCY)

Hypotension

.

Shock .

Hyponatremia

. Hyperkalemia.

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SYMPTOMS

ARE DUE TO ADRENAL ANDROGEN INSUFFICIENCY)

Decreased body

hair

Loss of libido especially in

female

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Secondary disease

All symptoms mentioned above .

Pt

don’t develop hyperpigmentation .

no hyperkalemia .

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ADRENAL CRISIS

-

Primary

acute

hypoadrenalism

.

sever fatally symptoms -Causes: stress, rapid withdrawal of steroids, adrenal hemorrhage, surgery and infection. -Circulatory shock with severe hypotension, hyponatremia, hyperkalemia. In some instances hypoglycemia .

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Treatment should not be delayed to wait for results in patients with suspected acute adrenal crisis.

If the patient’s condition permits, it may be appropriate to perform a short ACTH stimulation test before administering hydrocortisone.

Investigations should be performed before treatment is given if the patient’s symptoms suggest chronic adrenal insufficiency

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MANAGEMENT OF ADRENAL CRISIS

1-correct volume depletion with IV saline to normalise BP

2-replace glucocorticoids

3-correct other metabolic abnormalities

4-Identify and treat the underlying cause

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Random plasma cortisol is usually low in patients with adrenal insufficiency but it may be within normal range, yet inappropriately low, for a seriously ill patient

.

ACTH stimulation test is more

useful:

Cortisol levels fail to increase in response to exogenous ACTH in primary adrenal insufficiency.

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MANAGEMENT

-

Glucocorticoid replacement (always

):

oral hydrocortisone 15-20 mg daily in divided doses

. -Mineralocorticoid replacement (usually): Fludrocortisone 0.05-0.15 mg daily. -Androgen replacement (beneficial in women): DHEA (DeHydro EpiAndrosterone)50mg/day During stress or illness corticosteroids should be in increase 2 to 3 times .

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Adrenal

ct

scan in case of primary disease

Brain MRI in case of secondary disease in absence of steroids intake

If

pt

on steroids therapy for 3 weeks or more , dose should be tapered off gradually