NURS 453 test 3 Flashcards
Addison’s Disease
Incurable disease controlled w/ hormone replacement
90% of adrenal cortex destroyed
Primary cause of Addisons disease
Autoimmune (80%) and idiopathic
Secondary cause of Addisons disease
Steroid withdrawal, pituitary tumor
Adrenal glands produce
cortisol and aldosterone
what does cortisol do
helps the body respond to stress, maintains BP, balance the effects of insulin…has hundreds of functions
what does aldosterone do
helps maintain BP, H2O/Na+ balance
cortisol is a
glucocorticoids
aldosterone is a
mineralocorticoids
androgens
Sex hormones in both men and women
Patient Presentation in Addison’s Disease
Low BP, dizziness, orthostatic HoTN, hypoglycemia, fatigue, weight loss, hair loss, salt craving
Addisonian crisis or Acute Adrenal Insufficiency also known as
acute adrenal failure
what happens during acute adrenal failure
Adrenal glands STOP making hormones necessary for bodily functions = An acute deficiency of cortisol production
- Life threatening emergency!!!
acute adrenal failure results in
Circulatory collapse and electrolyte imbalance
signs and symptoms of acute adrenal failure
Non-specific
Will sometimes have fever
Hypovolemic Shock
Profound Hypoglycemia – lack of creating sugar and using it quick
Confusion, altered mental status – due to low MAPs/BP
Ventricular Dysrhythmias – V tach usually (potassium levels increase dramatically)
Vomiting, Diarrhea, Anorexia, Cramps
causes acute adrenal failure
stress, Adrenal surgery/hemorrhage
A patient’s circulatory collapse in an addisonian crisis is often refractory to fluids and vasopressors…. WHY???
we give them vasopressors during this crisis but the patient does not respond because they still lack the hormone needed to squeeze (increase their BP)
Labs in acute adrenal failure
look at BP and sugar in ER, low Na and Cl-, increased K, decreased glucose, make sure to look at cortisol, ACTH levels, and adrenal antibodies later
diagnostics in acute adrenal failure
ACTH stimulation test, Insulin-induced hypoglycemia test, CT, MRI
ACTH stimulation test
measure cortisol before and after synthetic ACTRH
Normal response is rise in cortisol – normal person
Addisons: little to no response, and high ACTH levels`
during acute adrenal failure there is Ongoing cortisol monitoring to monitor efficacy of steroid dosage. when do you take them?
Highest early in “morning” (0600 – 0800)
lower in the evening (1600 – 1800)
Immediate treatment of acute adrenal failure is directed at
combating circulatory shock - Restoring circulating volume…dehydration
Administer fluids (0.9% NS) (hyponatremia)
Monitor VS
Administer Corticosteroids (usually high doses)
nursing care plan of acute adrenal failure
VS…orthostatics
ECG monitoring
Bradycardia, heart block (due to the slowing of the SA and AV node conduction), peaked T waves, prolonged PR (due to the slower conduction)
Blood sugar
Electrolytes
Monitor and treat for hyperkalemia (at risk for V tach), hypoglycemia and hyponatremia
Neuro checks – seizures due to hyponatremia
Urine output (I & O)
Daily weights
Assist patients to avoid what during acute adrenal failure
stress - Physical, Mental, Emotional, Spiritual
Hydrocortisone
synthetic form of cortisol
what do we need to administer during acute adrenal failure
Corticosteroid administration
what do we want to maintain during acute adrenal failure
maintain perfusion with isotonic fluid and give vasopressors
education during acute adrenal failure
Importance to take cortisol replacement daily
↑ dose at times of stress (fever, flu, surgery, etc)
Double/triple doses!!!!!
Follow up with MD immediately
what concepts to think about during diabetic kept acidosis and HHS
Acid Base Balance - Directly linked to the cause/dehydration
Fluids and electrolytes (Key) - Dehydration!
Inflammation
Perfusion - Dehydration
DKA and insulin
Insulin Deficiency
Insulin dependent diabetics (Type I & II)
DKA what happens
Break down of FAT & PROTEIN→Ketones Rapid onset Liver continues to produce glucose Hyperglycemia (> 250) Osmotic Diuresis Severe Dehydration
HHS and insulin
Insulin Present (Only Type II) Liver continues to produce glucose
HHS what happens
Neuro signs may be the first really noted
Slower, insidious onset
Break down of fatty acids minimal because of insulin facilitating glucose transport into cells
NO KETONES
Hyperglycemia (> 600)
Osmotic Diuresis
Severe Dehydration
DKA diagnostic criteria
pH < 7.30 (Typically) - pH in SEVERE cases can drop below 7.0
Metabolic Acidosis (due to build up of lactic acid) w/ respiratory compensation
Blood glucose greater than 250 mg/dL
+ Ketones in blood and urine
Serum bicarbonate less than 18 mEq/L
aka CO2 on BMP/CMP
HHS diagnostic criteria
Blood glucose ˃ 600 mg/dL NO KETONES!!!!! Serum bicarbonate can be ˃ 18 mEq/L Serum osmolality can ˃ 320 mOsm/kg pH ˃ 7.30
Causes of DKA and HHS
Infection! Most common cause!
Increase demand brought on by illness/stress
↓ or missed insulin dose
Undiagnosed & untreated DM
DKA presentation
Ketoacidosis Insulin deficiency states Fat is broken down Brain is being fed to a degree with the ketones; lack of neuro changes Tends to be rapid onset
HHS presentation
Slower onset - why? -
Key: neuro changes
presentations that are seen in both DKA and HHS?
Hyperglycemia
Dehydration and electrolyte loss
Acidosis (lack of perfusion at the cellular level)
blood sugars in DKA
above 250
blood sugars HHS
above 600
why are there such high glucose levels during DKA and HHS?
Liver continues to produce glucose
Stress hormones induce more glucose production
Starving cells stressed – that is why we have polyphagia
Osmotic diuresis
↑ glucose causes ↑ serum osmolality
H2O moves from interstitial to intravascular = cellular dehydration - occurs during DKA and HHS
Why is there such bad dehydration in DKA and HHS?
osmotic diuresis, polyuria - can loose up to 7 liters of fluid in 24 hours, blood viscosity increases
ketoacidosis =
metabolic acidosis
what occurs during ketoacidosis?
decreased perfusion causes +++ lactic acid release r/t anaerobic metabolism
FAT/PRO breakdown used for fuel
Free fatty acids convert to ketones
Brain cells are especially sensitive to loss of glucose for fuel and inability to use fatty acid fuel. Seen first as ↓ LOC.
overall buildup of ketones results in metabolic acidosis
DKA: Clinical manifestations
Keys: RAPID ONSET
Polyuria: excessive urination (increased BS pulling water out of cells)
Polydipsia: dehydration, dry mouth, excessive thirst
Polyphagia: excessive hunger (cells are starving)
Others:
GI effects: n/v/abd pain
Neuro effects: Not as profound, ketones allow brain to be fed; can be altered LOC
vital signs in DKA
Kussmaul respirations: fruity/acetone breath – compensation for metabolic acidosis
Tachycardia/HoTN/Orthostatic HoTN
Fever – why? – possible infection and increase stress response
HHS clinical manifestations
Gradual onset so it is important to do history
Will have similar symptoms to DKA
Polyuria, Polydipsia, Polyphagia
GI symptoms: fewer to none…remember no ketones
Neuro effects (are Key for HHS, NO KETONES): (nothing to feed the brain cells)
Profound dehydration (sunken eyes, poor turgor)
possible seizures, reversible paralysis, death- Directly related to increased glucose causing serum osmolality to rise and having more neurological manifestations
Labs for DKA and HHS
+ Ketones (serum and urine) are defining factor to determing if you have DKA or HHS
ABG: ↓ pH, ↓ bicarb
CMP(complete metabolic panel)/BMP:
↓CO2, ↓ Na+
K+ can be normal, depends on time frame; huge losses as it progresses
↑ BUN (30 mg/dL) and ↑ Creatinine (1.5 mg/dL)
Anion gap >12
Serum osmolality high (HIGH) – due to concentration of blood
anion gap
Difference between the cations and anions in the extra cellular fluid (ECF)
Normal levels: 10 – 14 mEq/L
Initial Interventions DKA and HHS
ABCs..
Ensure patent airway
Administer oxygen
FLUIDS!!!!…
IV access – hydration!
Begin fluid resuscitation then give them regular insulin
Electrolyte replacement once partial glucose correction
treatment for DKA/HHS
Utilization of standing orders/protocols – ensures we are not overcorrecting the patient too fast (can cause cerebral edema)
Reversing dehydration
Reverse ketoacidosis (DKA)
Replacing insulin (once you have established rehydration)
fluids during DKA/HHS
0.9% NS (if Na+ high give 0.45%) until glucose is about 300 to 250; then switch to fluids with Dextrose like D5 0.45%NS or D5 0.9% NS. What does this prevent? – preventing cerebral edema
when do you know that you should switch to D5 in DKA/HHS treatment?
u/o ˃ 0.5ml /kg/hr and B/P normal
DKA/HHS and potassium
pts can be either hyperkalemic or hypokalemic – hyperkalemic why? – renal compromise and cannot excrete
Aim for BG reduction in reversing acidosis
36 – 54 mg/dL/hour (45 an hour is what we are hoping for)
Hourly evaluation of BG
Acidosis as a result of ketosis is primarily reversed with
insulin (and fluids)
Nursing Diagnosis for DKA and HHS
Deficient fluid volume r/t absolute loss
what hormones does the anterior pituitary secrete?
Growth hormone - controls growth
Prolactin - stimulates production of milk after childbirth
ACTH (adrenocorticotrophic hormone) - stimulates production of hormones from the adrenal glands
TSH (thyroid stimulating hormone) - stimulates production of hormones from thyroid gland
FSH (follicle stimulating hormone) and LSH (luteinizing stimulating hormone) - stimulate activity in the ovaries of women and the testes in men.
The posterior pituitary secretes
ADH (anti-diuretic hormone) - controls the concentration of urine
Oxytocin - stimulates the contraction of the womb during childbirth and the secretion of milk for breast feeding.
how would you fix a pituitary tumor?
Transphenoidal hypophesectomy or
Laproscopic surgery through nose or through the upper lip
post op care after removal of a pituitary hormone?
no nose blowing or deep breathe and cough. may need dressing depending one where the incision was, oral care, monitor for diabetes encipitus – will cause issues with fluids and electrolytes
DI
Deficiency of antidiuretic hormone (ADH, vasopressin) results in inability to conserve water
SIADH
Excessive amounts of ADH secreted from posterior pituitary and other ectopic sources. – body not producing urine
commonality between DI and SIADH
ADH – key component that we see between the two
DI causes
unknown, idiopathic, tumors
SIADH causes
80% r/t small cell carcinoma
risk factors for DI
head injury, neurosurgery, tumor
SIADH risk factors
increased ICP, malignant conditions
what happens in DI
Permeability of water is diminished, resulting in excretion of large volumes of hypotonic fluid.
what happens in SIADH
Water Retention
Hyponatremia (dilutional)
Hypo-osmolality - A continual release of ADH causes water retention from renal tubules and collecting ducts.
DI physical exam
Mucous Membranes - Dry Skin - Dry, cool skin Cardiovascular (more acute) - Tachycardia to respond to fluid loss Electrolyte Problems (acute) weight loss decreased level of consciousness faucet pee
SIADH physical exam
R/T Hyponatremia - Decreased deep tendon reflexes, confusion, seizures, fatigue, H/A, anorexia, nausea, decreased mental status, seizures, coma. R/T Fluid Vol. Excess - Wt. gain w/o edema - JVD - Tachycardia - Tachypnea - Rales (crackles) GI - decreased motility
complications of DI
Electrolyte Imbalance
Hypovolemia
Hypotension
Shock
complications of SIADH
Seizures
Coma
Permanent brain damage
Further complications of existing disease processes.
diagnostics of DI
Urinary OutPut- A few liters to 18L/d Serum Osmo ↑ >290 Serum Na+ ↑ >150 Sp. Gravity < 1.005 Water deprivation study
diagnostics of SIADH
Serum Na+ ↓ < 130
Urine Na+ ↑
BUN ↓
urinary output low – urine will be concentrated
management of DI
Surgical:
Hypophysectomy
Medical:
IV Fluids – quarter saline – remember they are holding onto sodium
management of SIADH
Surgical: None Medical: Hypertonic Flds. Demeclocycline (antibiotic) to facilitate free water clearance (side effect) Sodium restriction Diuretics due to low plasma osmo Treat underlying cause.
nursing management for DI/SIADH
monitor Daily Wt. & I/O
What do you do for a thirsty pt? – hard candy if they can swallow safely
functions of the kidney
filtration, reabsorption, secretion, production of erythropoietin, production of renin (important for regulation of BP
nutrition and renal failure
too much protein can cause kidneys to shut down. renal failure causes altered Ca and phosphorous.
kidney and aging
starts to shrink, decrease in GFR, increase in BUN and creatinine
lab studies in kidney patients
U/A Culture & Sensitivity Specific Gravity Ketones, Protein, Glucose BUN/Cr 10:1 Electrolytes Calcium/Phosphorus Bicarbonate CBC Osmolality
diagnostics in renal patients
KUB IVP Ultrasound CT/MRI Cystoscopy Urethrogram Renal Bx Cystogram
Acute Renal Failure
A clinical syndrome characterized by a rapid loss of renal function with progressive azotemia (an accumulation of waste products [BUN & Cr]. Also includes changes in electrolytes and fluid status.
Uremia: (Literally, urine in the blood).
Oliguria: decreased UOP <400ml/d
AKI development
Usually develops over hours to days with progressive elevations of BUN, Cr & K+
60% of ICU pts with 70% -80% Mortality
AKI prerenal
factors external to kidney (Hypovol., Dehydration, Hemorrhage, Burns, Cardiac issues, Anaphylaxis, Neuro Injury, Septic Shock, Thrombosis)
Low UOP, rise BUN & Cr 10:1, inability to conserve Na.
Usually Reversible shock – effecting kidney at prerenal status
infrarenal AKI
Direct damage to parenchyma resulting in impaired nephron fxn ( prolonged ischemia, nephrotoxins, myoglobin)
ATN (Acute Tubular Necrosis) 90% of all AKI
post renal AKI
Mechanical obstruction of urinary outflow (BPH, prostate CA, calculi, trauma) < 10% of AKI
initiating phase AKI
This begins at the time of the insult and continues until the signs and symptoms become apparent.
Lasting hours to days.
Oliguric Phase AKI
Reduction in GFR
Occurs within 1-7 days of causative event
Duration 10-14 days, but can last months
The longer in this phase the poorer the prognosis for recovery of complete renal function.
Urinary Changes, Fluid Vol. Excess, Metabolic Acidosis, Sodium Balance Loss, Potassium Excess
diuretic phase AKI
Begins with gradual increase in dly UOP secondary to high urea concentration in the urine and the inability of the tubules to concentrate the urine.
Can excrete waste, but not concentrate
Must monitor lytes and hydration levels
Lasts 1-3 weeks
Patients lab values begin to normalize near the end of this phase
recovery phase AKI
Begins with increasing GFR
BUN and CR levels plateau and then decrease
Improvements occur in first 1-2 weeks of this phase, but renal function may take up to 12 months to stabilize
Outcome influenced by the patient’s overall health, severity of renal failure and the number and type of complications
Some will progress to CRF
Older adults less likely to recover full function
Those who recover achieve clinically normal function without complications.
Acute renal failure diagnostics
H&P, UA, Chemistry, US, CT, MRI
care for ARF
Adequate Perfusion Diuretics Fluids K+ Nutrition – protein, potassium, sodium, calcium, phosphorous Dialysis
Rhabdomyolysis Patho
the breakdown of muscle fibers resulting in the release of muscle fiber contents (myoglobin) into the circulation. Some of these are toxic to the kidney and frequently result in kidney damage.
causes of rhabdo
Traumatic Injury (Burns, Crush Injury, Electrocution, Blunt Force, Lightening Strike)
Excessive Exertion
Ingestion of Toxic Substances inclusive of Drugs and ETOH (inhibits ADH secretion)
Status Epilepticus
Shock Induced Hypoxia
Hypothermia/Hyperthermia
s/s of rhabdo
tea colored urine, Muscle Weakness, Gen. Fatigue
hallmark of rhabdo
increase in serum Creatine kinase