Med Surg Exam 1 Flashcards
What is the role of the kidney’s in regulating the body’s fuid volume and and composition?
Regulates ECF volume and osmolality by excreting/retaining body fluids
Regulates electrolytes by selective retention of electrolytes or excretion of hydrogen ions
Regulates ECF by excretion or retention of hydrogen ions
Excretion of metabolic wastes or toxic substances
What is the role of the lungs in regulating the body’s fluid volume and composition?
They remove water (300mL daily)
What does the pituitary gland do to regulate the body’s fluid volume and composition?
Secrete AHD when dehydrated/during blood loss to increase reabsorption of water.
What does the adrenal cortex do to regulate the body’s fluid volume and composition?
Increases aldosterone to cause sodium and water retention, and potassium loss
Decreased aldosterone does the opposite
What do the parathyroid glands do to regulate the body’s fluid volume and composition?
Use parathyroid hormone to influence calcium and phosphate balance
What does the Renin-Angiotensin-Aldosterone system do to regulate the body’s fluid volume and composition?
Renin goes to the liver and converts a protein into angiotensin I, ACE converts that into angiotensin II, angiotensin II stimulates the the adrenal gland to produce aldosterone.
What does the hypothalamus do to regulate body fluid volume and composition?
During dehydration it secretes AHD to stimulate thirst, and for kidneys to increase water reabsorption.
What are the isotonic solutions we use?
0.9% NaCl (normal saline)
Lactated Ringer’s
5% Dextrose in Water
What is normal saline used for?
hypovolemia
shock
diabetic ketoacidosis
metabolic acidosis
hypercalcemia
What is LR used for?
hypovolemia
burns
fluid loss from diarrhea
acute blood loss
fluid loss from bile
What is D5W used for?
Hypernatremia
Fluid loss
dehydration
What are the hypotonic solutions?
0.45% NaCl (half strength saline)
What do we use half strength saline for?
hypertonic dehydration
Na+ or Cl- depletion
gastric fluid loss
What are the hypertonic solutions?
3% NaCl
5% NaCl
What are the hypertonic solutions used for?
Symptomatic hyponatremia
What lab values would you use to determine if someone is adequately hydrated?
BUN
Creatinine
Hematocrit
Urine Sodium
Urine Specific Gravity
Serum Osmolality
Urine Sodium
What does the BUN lab value show?
Measures the amount of urea in the bloodstream. Can vary with renal function, cellular breakdown, protein intake, and hydration status. Not an optimal gauge of kidney function.
What does the creatinine lab value show?
The breakdown product of muscle metabolism cleared from the bloodstream and excreted by the kidneys.
Accurate gauge of kidney function.
Does not vary with protein intake or hydration status
What does hematocrit measure?
The percentage of RBC in a volume of whole blood.
Decreased water increases the concentration of RBCs
Overhydrtion will decrease the RBC concentation
Anemia causes decreased hematocrit
What does the urine sodium lab value measure?
The level of sodium in the urine
As sodium intake increases, so does excretion
As fluid volume decreases, sodium is retained
What are risk factors for overhydration?
Age (disease)
- Too much intake
- Immobility
- Corticosteroids (puffy after taking)
- Burns (fluid shifts after burns-vascular damage)
- Heart and kidney failure
- Diet (sodium that comes mostly from packaged foods)
What are expected findings for overhydration?
Crackles lower lobes
- HTN most of time
- Polyuria (unless there is renal failure)
- Edema
- JVD, Ascites (fluid collects in the abdomen)
- SOB, Cough
- Weight gain (3 lbs in 24 hours, or 5 lbs in a week indicates fluid influence on weight)
What are lab tests for overhydration?
Decreased hematocrit and hemoglobin due to dilution
- Decreased osmolarity (amount of solutes in one volume of fluid)
- Urine sodium and specific gravity decreased
- CBC
What nursing care is performed for overhydration?
Daily weight
- Strict I&O (fluid restriction 2 L per day)
- Assess all s/s
- Restrict sodium to 2 grams per day
- Semi-Fowlers position
- Diuretics (furosemide - pulls fluid and potassium DEHYDRATION/HYPOKALEMIA CONCERN)
What are some complications of overhydration?
Pulmonary Edema (flash PE develops quickly)
- SOB
- Decreased O2
- Hear crackles (only posterior chest- lower lobes)
What are some risk factors of dehydration?
Low intake
- Diabetes Insipidus (polyuria)
- Diuretics
- Excessive sweating/heat
- GI loss
- Medications/substance use
- Hemorrhage
- Third spacing (ICF moves into the ECF, the body doesn’t want it there so it pushes it to the area around the cells)
What are expected findings for dehydration?
Hypotension
- Tachycardia
- Dry mucous membranes
- Tented and dry skin
- Oliguria, dark urine
- Neurosymptoms
- Orthostatic hypotension
- Cool skin
What are common lab tests for dehydration?
- Elevated hematocrit and hemoglobin
- Increased osmolarity
- BUN- kidneys
- Increased BUN= kidneys overwork due to less fluid
What nursing care is performed for dehydration?
Fluids (oral first then IV)
- True Bolus- less than 30 min on straight tubing. Using isotonic fluid (normal saline). This expands the ECF.
- Monitor I&O
- Daily weights
- Fall Risk
- Change positions slowl
What are some complications of dehydration?
- Hypovolemic shock (tissues not getting what they need to survive)
What are 3 lab tests for kidney function?
BUN, Creatinine, GFR
True/False: Normal Saline is the only solution you can mix with blood products through IV
True
9% normal saline is similar to ____
plasma
Lactated Ringer Solution cannot be used in
kidney injury due to potassium which could cause hyperkalemia
5% dextrose in water should not be used solely for
fluid volume deficit because it dilutes electrolyte concentrations
In Fluid Volume Deficit, which 4 things should you assess
ADLs, Ambulation, Cognition, Gag reflex
Are electrolytes charged or uncharged?
Charged
What is the sodium range?
135-145
What is the potassium range?
3.5-5.0
What is the magnesium range?
1.3-2.1
What is the calcium range?
9.0-10.5
What is the chloride range?
98-106
What is the phosphorus range?
3.0- no max given
What does water follow?
Salt
What does sodium imbalance indicate?
water problem
Acute hyponatremia is the result of
fluid overload of a surgical patient
What are manifestations of hyponatremia
- Weakness
- Lethargy
- Confusion
- Seizures
- Headache
- Anorexia, N&V
- Muscle cramps, twitching
- Hypotension
- Tachycardia
- Weight game, edema
Seizures are a big risk because of
aspiration and self harm
Interventions for hyponatremia
- Sodium replacemnt
- Fluid restriction
- Daily weight, I&O
- Medication: conivaptan hydrochloride
Risk with hypertonic solutions
cerebral edema
What sodium labs should you check?
BMP or CMP
Do not correct sodium more then?
12 mEq every 24 hours
If you are close to overcorrecting sodium
Stop and do a neurological assessment
What are the manifestations of Hypernatremia?
Fever,
swollen dry tongue,
sticky mucous membranes, hallucinations,
lethargic,
restlessness, and irritable,
seizures,
tachycardia,
hypertension,
hyperreflexia/twitching,
pulmonary edema.
Emphasized manifestations of hypernatremia
swollen dry tongue
- hallucinations
- lethargy
- restlessness
- irritable
- seizures
- pulmonary edema
interventions for hypernatremia
daily weights
I & O
seizure precautions
iv infusion of hypotonic or isotonic fluid
diuretics
restrict sodium diet
increased oral fluids intake
Emphasized interventions for hypernatremia
daily weights
- I&O
- Sodium Restrictions
Burns impact ________
vascular impermeability
Patients with hypernatremia that are on fluid and sodium restrictions are often?
Severely Thirsty
Key thing to watch out for potassium
heart effects
What are manifestations of hypokalemia
Muscle weakness, cramping
- Fatigue
- N&V
- Irritability, confusion
- decreased bowel motility
- paresthesia
- dysrhythmias
- flat and/or inverted T waves
Interventions for hypokalemia
Monitor respiratory status
- Fall precautions
- Potassium replacement
- Monitor EKG, I&O, arterial HCO3 and pH.
- Client education
- Dietary sources (greens, milk, juices, lean meat, potato skin)
- Medications
Never give potassium IV bolus through a
straight line, must be with a pump
2 main causes of hypokalemia
GI loss and diuretic use
If there is a significant potassium issue, request an order for a
telemetry
Do not run IV potassium faster than
10 mEq/hr with a peripheral IV
If patent is not urinating (give/not give) potassium
No P, No K
IV potassium can cause a ___ sensation
burning
Manifestations of Hyperkalemia
Peaked T waves,
ventricular dysrhythmias,
muscle twitching and paresthesia (early), ascending muscle weakness (late), increased bowel motility
Key Manifestations of Hyperkalemia
Peaked T waves,
Ventricular Dysrhythmias,
Cardiac Ectopy
What is cardiac ectopy?
Extra abnormal heartbeats that begin in one of the two ventricles
Interventions for Hyperkalemia
Monitor ECG,
Monitor Bowel Sounds,
Initiate Dialysis
Dietary restrictions,
Administer medication
5 common Medications for Hyperkalemia
Kayexalate
50% glucose w/ insulin
Calcium Gluconate
Bicarbonate
Loop Diuretics
What does kayexalate do?
Removes K+ via the gut
What does 50% glucose with insulin do?
Pulls glucose into the cell, and is given via IV
What does calcium Gluconate do?
Antagonizes the hyperkalemic action on the heart, but does not lower the potassium level
What does bicarbonate do for hyperkalemia?
It lowers potassium levels when mixed with insulin.
What does loop diuretics do for hyperkalemia?
Loop diuretics like furosemide lower the potassium level through excretion
In a Acidotic state, _______ is high.
Potassium
Manifestations of hypocalcemia
Tetany, cramps
- Paresthesia
- Dysrhythmias
- Trosseau’s sign
- Chvostek’s sign
- Seizures
- Hyperreflexia
- Impaired clotting time
Interventions for hypocalcemia
Seizure precautions
- IV calcium replacement
- Daily calcium supplements
- Vitamin D therapy
- Monitor for orthostatic hypotension
-Dietary increase and education
Calcium affects your ___ system
neuromuscular
Common diseases with hypocalcemia
Kidney and parathyroid (calcium regulation) disease
Calcium has an inverse relationship with
phosphorus
Calcium IV is best replaced through a
Central line as it helps to avoid vessel damage and helps with monitoring extravasation
Hypercalcemia is tied to what disease?
Malignant disease
Manifestations of Hypercalcemia
muscular weakness
constipation
anorexia
n/v
polyuria
polydypsia
hypoactive deep tendon reflexes
lethargy
Interventions of for Hypercalcemia
Increase mobility,
isotonic IVF,
Dialysis,
Cardiac Monitoring
Manifestations for hypomagnesemia
positive Troussea and Chovstek Sign
increased tendon reflexes
neuromuscular irritability
mood changes
anorexia
vomiting
elevated BP
Interventions for hypomagnesemia
Seizure precautions
- Monitor swallowing
- Dietary measures and education
- Adminiter IV magnesium sulfate and PO magnesium salts (give PO first)
- Monitor urine output
- Monitor respirators
Magnesium acts like a
sedative