314 Final Flashcards
Corticotropin Releasing Hormone –> (4)
Anterior pituitary –> ACTH –> adrenal cortex –> glucocorticoids/steroid hormones
Describe negative feedback loop
The hormone released by the target organ stops the hypothalamus and pituitary from releasing hormones that stimulate target organ
What is an example of a glucocorticoids?
Cortisol
Adrenal glands produce glucocorticoids but do not
Store them
4 key times in the cortisol circadian rhythm
Peak at awakening, 8:30AM
Decrease during the day
Lowest at midnight
Start rising around 2-3AM
What is the hypothalamus stimulated by? (2)
Stress
CNS stimuli
Physiological effects of glucocorticoids in terms of metabolism (6)
Increased gluconeogenesis
Increased glucose storage as glycogen
Increased lypolysis and fat redistribution
Decreased protein synthesis
Decreased glucose uptake into fat and muscle
Decreased peripheral to glucose use
Thyrotropin releasing hormone (TRH) –> (4)
Anterior Pituitary –> releases TSH –> Thyroid –> releases thyroid hormones
Physiological effects of glucocorticoids in CV system
Maintains vasculature integrity
Increased RBC
Decreased LEBM
Low dose glucocorticoids for endocrine treatment
Physiological
High dose glucocorticoids for non-endocrine treatment
Pharmacological
All glucocorticoids produce the same therapeutic effect but differ in three areas
Half life
Mineralocorticoid potency
Anti-inflammatory potency
Low dose glucocorticoids for endocrine treatment
Physiological
High dose glucocorticoids for non-endocrine treatment
Pharmacological
All glucocorticoids produce the same therapeutic effect but differ in three areas
Half life
Mineralocorticoid potency
Anti-inflammatory potency
Effects of pharmacological doses of glucocorticoids (4)
Decrease synthesis of chemical mediators
Decrease infiltration of phagocytes
Decrease proliferation of lymphocytes
Glucocorticoids inhibit chemical mediators such as (3)
Prostaglandins
Leukotrienes
Histamines
Inhibition of chemical mediators means decreased (4)
Pain
Edema
Erythema
Warmth
Why do glucocorticoids have greater anti-inflammatory effects than NSAIDs?
More diverse mechanisms
One side effect of pharmacologic doses of glucocorticoids is that
Physiologic effects are magnified
Therapeutic uses of pharmacologic glucocorticoids (10)
Rheumatoid arthritis Lupus Inflammatory bowel disease Osteoarthritis Allergies Dermatology Asthma Neoplasms Immunosuppression for skin graft Prevention of respiratory distress syndrome
4 systemic routes of glucocorticoid administration
Oral
IM
SQ
IV
Local administration routes (4)
Topical
Inhalation
Intranasal
Intra-articular
High lipid solubility increases the risk for
Systemic effects
Multiple small doses of glucocorticoids means better maintenance of blood levels within therapeutic range, but increases the risk of
Adrenal suppression
Large doses of intermediate acting glucocorticoids every other day
Alternate dosing
Alternate dosing decreases (3)
Adrenal suppression
Growth retardation
Toxicity
May fall to sub therapeutic levels
Alternate dosing
Normal body temperature range
36-37.5
When is the temperature highest?
Late afternoon/early evening
Temperature drops between
8-2AM
Heat producing behaviors (5)
Superficial vasoconstriction
Contraction of pilomotor muscles
Huddle position
Shivering
Increased epinephrine and thyroid hormones
Heat dissipation (2)
Superficial vasodilation
Diaphoresis
Superficial vasoconstriction allows heat loss through
Convection or radiation
Diaphoresis allows heat loss via
Evaporation
What substance increases thermoregulatory center set point?
Prostaglandin E2
Purpose of pyrexia (3)
Increased WBC activity
Increased interferon production
Activation if T cells
If the body temperature increases by 1°C, how much will the heart rate increase?
15 bpm
If the body temperature increases by 1°F, how much will the heart rate increase?
10 bpm
Determining the underlying cause is important when treating
Fever
Fever treatments (5)
Cool sponge bath
Cooling blanket
Fluids
Carbohydrates
Antipyretics
Groups that may have blunted fever responses (3)
Infants
Immunocompromised
Eldery
Examples of immunocompromised individuals (3)
HIV
Chemotherapy
Organ transplant
Core temperature between 37.8°C and 40°C
Heat exhaustion
Core temperature above 40°C/104°F
Heat stroke
Hypothermia range
Below 93°F or 35°C
Most sensitive method for screening diagnosing and monitoring treatment of thyroid issues
Serum TSH
Which serum test can monitor thyroid hormone replacement therapy?
Serum T4
Used for the diagnosis of hyperthyroidism
Serum T3
Both tests for T3 and T4 are obtained after
Serum TSH
Lifelong levothyroxin (T4)
Hypothyroidism
A severe form if hypothyroidism
Myxedema
What is myxedema called in infants?
Cretinism
Does myxedema cause pitting edema?
No
Causes mucus type of edema
Myxedema
Drug for hypothyroidism (trade) (3)
Synthroid
Levoxyl
Levothroid
Generic name for hypothyroidism drug
Levothyroxine