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Flashcards in Adrenal Glands Deck (35)
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1

General Role of Adrenals

and location

Located on kidneys,

play major role in response to stress

2

Adrenal cortex stimulated by ..... releases.......

 

Adrenal Cortex- 80% of weight-

stimulated by ACTH from pituitary gland

  • Zona glomerulosa- aldosterone
  • Zona fasciculata- cortisol, cortisone and corticosterone
  • Zona reticularis- aldosterone, androgens and estrogens, and glucocorticoids

**we will not be asked which zona produces what?

3

Adrenal Medulla stimulated by ..... releases.......

Adrenal Medulla- stimulated by sympathetic nervous system

Secretes epinephrine and norepinephrine

4

  • What percentage of epi and norepi are from the chromaffin cells of the Adrenal Medulla?
  • What percentage is found nerve terminals?

Why do we care?

  • 30% of epi and nor epi are from the adrenal medulla
  • 70% of epi and norepi are found in nerve terminals

The epi and norepi coming from the adrenal medulla are sectreted into the blood stream and considered hormones.

The 70% of epi and norepi found in the nerve terminals are considered neurotransmitters.

This is why epi and norepi are each considered both a hormone and neurotransmitter

5

What is a reason that epi and norepi being considered both a neurotransmitter and hormone is good (according to Dr. T)?

The redundancy allows us to still make these important substances if something stops working (like the adrenal gland)

6

What are the three categories of hormones secreted by the adrenal cortex?

Glucocorticoids

Mineralcorticoids

Adrenal estrogens and androgens

7

What is the most important glucocorticoid?

Cortisol

8

what are three roles of cortisol?

Metabolic

Anit-inflammatory

Growth-Suppressing

9

Explain the metabolic role of cortisol

What are 4 big effects we may see?

–Metabolic- stimulates protein catabolism (connective tissue breakdown) and glucose formation (increases fat deposition, especially abdomen, cheeks, supraclavicular)

•May have

  1. severe muscle wasting,
  2. diabetes,
  3. ovarian disease,
  4. obesity

10

Explain the anti-inflammatory role of cortisol

What big effects may we see?

What did dr. t remind us of?

–Anti-inflammatory-

  • decrease T cell formation and function,
  • suppress cytokines (immune response),
  • stabilize lysosomes;

may see poor wound healing

If given as an anti-inflammatory, will shut down everything down below it in the inflammatory cycle/cascade (such as when comparing it to NSAIDS)

11

Explain the growth-suppressing role of cortisol

What big effect may we see?

–Growth-suppressing-

  • inhibition of bone formation,
  • lead to osteoporosis

May see pathological fractures

12

What is the main Mineralocorticoid relased by the adrenal cortex?

aldosterone

13

What are two main functions of Aldosterone?

conserves sodium

inhibits reabsoprtion of potassium (rids body of potassium)

14

Aldosterone: What is the purpose of conserving sodium and eliminating potassium?

 

–Conserves sodium, thereby increasing blood volume

  • •Renin-angiotensin-aldosterone system (RAAS, or RAS) – regulates blood pressure and fluid balance, stimulated by low blood pressure

–Inhibits renal reabsorption of potassium

15

Aldosterone: how is this hormone related to pharma blood pressure control

•Potassium sparing drugs can be used to control BP

 

Wikipedia says they also promote excretion of sodium

 

Drugs that interfere with the secretion or action of aldosterone are in use as antihypertensives, like lisinopril, which lowers blood pressure by blocking the angiotensin-converting enzyme (ACE), leading to lower aldosterone secretion. The net effect of these drugs is to reduce sodium and water retention but increase retention of potassium. (wikipedia)

16

How do the hormones of the adrenal cortex related to anabolic steroids use?

People who take anabolic steroids, will get into problems with endocrine dysfunction (roid rage, connective tissue problems, out of control muscle hypertrophy, nausea and vomiting).

 

Because the Adrenal Cortex secretes adrenal estrogens and androgens (so anabolic steroids mess with this process)

17

What is cortisol released based on?

When is cortisol the highest and how does this affect other hormones?

Circadian release.

Best cortisol levels between 6 am and 6pm.

  • There will be times when people have more energy (morning)
  • Everything cortisol influences will be timed based on when cortisol is high.

18

T/F: both too much or too little cortisol will interfere with tissue repair and healing

True

Cortisol is important, but it must be balanced. If there is too much or too little, it will interrupt repair.

19

How does cortisol block early stages of inflammation? (5)

•Block early stages of inflammation before it begins

  1. –Stabilize lysosomal membranes
  2. –Decrease capillary permeability
  3. –Decrease migration of WBC’s into area and decrease phagocytosis
  4. –Immune suppression decreased lymphocyte reproduction
  5. –Attenuates fever by decreasing release of interleukin-1

20

How does cortisol produce rapid resolution after inflammation has begun to promote healing? (4 ish)

Rapid resolution after inflammation has begun to promote healing, less well understood how

  • –By blocking factors promoting inflammation as in early stages of inflammation
  • –Possibly
    1. •Mobilizing amino acids for repair
    2. •Increasing glucogenesis- energy for repair
    3. •Increased fatty acids- again energy for repair
    4. •Inactivation or removal of inflammatory factors

(not really sure I understand this slide)

21

What can be done to treat deficienecy in mineralcorticoids?

Is it successful?

Drawbacks? (4)

use mineralocorticoid agonist drugs

•Replacement therapy- usually successful

–Can cause hypertension due to increase in sodium and water retention (but this is treatable too)

–Peripheral edema, weight gain and hypokalemia can be side effects

22

How do mineralocorticoide antagonist drugs work?

What are they for?

What precautions?

•Bind to aldosterone receptor blocking it

–Diuretics resulting in sodium and water excretion

–Must be careful to treat hypertension by excreting sodium and water while sparing potassium (more on that when we talk about the kidney)

23

What usually causes primary adrenal insufficiency?

what is another name for it?

•Primary adrenal insufficiency – usually is from destruction of gland through autoimmune disease

•Also called Addison’s Disease

24

how do you treat addison's dz?

•Hyposecretion can be treated by administering cortisol

25

Addison's Dz: What happens with mineralcorticoid deficiency?

 

•Mineralocorticoid Deficiency

  • –Lack of aldosterone secretion- decreasing sodium reabsorption
    • •Hyponatremia, hyperkalemia and mild acidosis
      • –Decreased extracellular fluid,
      • decreased plasma volume,
      • RBC concentration rises therefore hematocrit,
      • cardiac output decreases

26

Addison's Dz: What happens with glucocorticoid deficiency?

–Decreased cortisol secretion- decreased glucose levels

•Weakness and fatigue even when nutrients are available

27

S/S Addison's Dz: (8)

  1. •Dark pigmentation of the skin, in varying degrees – may be freckles, or look like a healthy, glowing tan, or darkening around mouth and scars
  2. •Hypotension
  3. •Progressive fatigue, improves with rest
  4. •Hyperkalemia, causing weakness and muscle flaccidity
  5. •GI disturbance, anorexia, weight loss, N&V
  6. •Arthralgias with secondary myalgias
  7. •Tendon calcification
  8. •Hypoglycemia

28

what should we do if we see pigment changes in the mouth?

Inside the mouth is not a normal spot to see pigment changes. We should get it checked it we see pigment changes in the mouth.

29

What is secondary adrenal insufficiency?

what can cause it? (4)

what can be done?

 lack of pituitary ACTH

Causes

  • –Pituitary or hypothalamus tumors or removal of glands
  • –Rapid withdrawal of corticosteroids

–Can be managed with drugs

30

Explain why weaning off of corticosteroids too quickly can cause secondary adrenal insufficiency

This can happen if we wean of corticosteroids too quickly.

If we administer synthetic steroids. We must wean off because the adrenal glands must have a chance to restart.

Watch out for pts who decide to stop taking it abruptly (Because it makes them feel weird)