Corticosteroids and Immune Modulatory Agents Flashcards
(28 cards)
What system do corticosteroids and immunomodulatory agents have a significant effect on?
the immune system
what are the main properties of corticosteroids?
anti-inflammatory and immunosuppression
what can potent corticosteroids affect?
Hypothalamus, pituitary, adrenal or HPA axis
Why were immunomodulators/immunosuppressants used?
minimise effects of long-term corticosteroid use
what might corticosteroids be prescribed for?
- dermatology - topical steroids for inflammatory skin conditions eg: eczema, dermatitis, lichen planus
- respiratory - inhaled steroid for control of mild-moderate asthma
- gastroenterology - used in high dose for long period of time to treat acute flares of severe inflammatory bowel disease (eg: crohns and ulcerative colitis)
- blood disorders (autoimmune anaemias)
- immunosuppression after organ transplants
- rheumatoid arthritis
what can happen in situations of stress when a patient is given exogenous steroids? what can this present as?
the adrenal glands are not able to produce enough cortisol to maintain blood pressure, fluid balance
- can present as an Addisonian crisis
what might you consider doing if carrying out a potentially stressful procedure?
whether the pt needs an additional exogenous prescription to make up for any increased requirement due to physiological stress
what is cortisol?
Cortisol is a steroid hormone, in the glucocorticoid class of hormone
what happens to your bodys natural cortisol production when taking corticosteroids?
steroids provides your body with cortisol so your adrenal glands temporarily shut down and do not produce cortisol
what are some of the risks with taking long term steroids?
increased susceptibility to infection (eg: oral candida)
or osteoporosis due to steroid effect on bone metabolism
what are the 2 main types of endogenous steroids?
mineralocorticoids and glucocorticosteroids
why might mineralocorticoids (aldosterone/fludrocortisone) be prescribed?
typically for postural hypotension or long term maintenance of Additions disease (mostly related to fluid balance and control of electrolytes in the body
what is the mode of action of steroids? how do they do this?
prevent the immune system from over-reacting and their immune/inflammatory systems from being activated. they bind to receptors intracellularly that affect gene transcription to either suppress or promote the activation of certain genes OR reduce prod. of interleukins = less prod. of prostaglandins (in inflammatory), dampen prod. of histamine
when does adrenal suppression occur?
after long term use of high dose corticosteroids OR v potent ones - causes adrenal glands to shut down (short courses can suppress the HPA axis BUT the body can recover)
How can we ensure the body recovers after drug withdrawal of corticosteroids?
done so very gradually (over period of weeks) to allow the HPA axis to recover and produce its own endogenous cortisol again
during periods of infection, trauma or surgery what will happen to the dose of patients on long term steroids?
at least continue the same dose/increase it so that there is sufficient exogenous steroid to make up for that which would normally be produced when body is under stress
what is adrenal crisis?
occurs on sudden cessation of steroids of steroid therapies or not increasing the dose sufficiently during periods of physiological stress
what is an acute adrenal crisis caused by? what might the patient experience?
lack of cortisol
- experience light-headedness, dizziness, weakness, sweating, abdominal pain, nausea and vomiting or even loss of consciousness
what is cushings syndrome? what features are displayed?
commonly occurs after prescription of long-term corticosteroids - pt displays body habits of pt taking long term or potent steroids
- present with
→ fat deposition at base of neck
→ swelling and rounding of the face due to fluid retention
→ proximal muscle wasting with deposition of more fat around abdominal organs
→ hypertension and diabetes
what are some adverse effects of steroid use?
osteoporosis
easy bruising
poor wound healing
long term: development of cataracts (if pt can’t see they will struggle to maintain oral hygiene)
why do steroids need to be prescribed early on in the day?
natural circadian rhythm and production of steroids peaking early morning when produced naturally by the body
why do steroids need to be prescribed early on in the day?
natural circadian rhythm and production of steroids peaking early morning when produced naturally by the body
what are immunomodulators/immunosuppressants prescribed for?
crohns, ulcerative colitis
* Used in prevention of rejection following organ transplant (to prevent host versus graft reactions where the recipient’s body attempts to destroy the grafted tissue from the donor)
* Bone marrow transplants (graft versus host where the grafted donor cells attack the recipient’s own cells and cause significant morbidity if not mortality)
* Autoimmune conditions eg: glomerulonephritis, SLE, RA
* In oral medicine, can be prescribed for pemphigus vulgaris, major aphthous ulceration, erythema multiform and severe Lichen Planus
what are some examples of biologics?
abatacept (Orencia)
adalimumab (Humira)
dupilumab (Dupixent)
etanercept (Enbrel)
infliximab (Remicade)
mepolizumab (Nucala)
omalizumab (Xolair)
rituximab
