Fluid And Electrolytes Flashcards
Electrolyte found in extracellular fluid
Sodium
Functions of sodium
Acid-base balance, fluid balance, active and passive transport, irritability and conduction of nerve muscle tissue
Normal sodium range
135-145 mEq/L
S/S of hypernatremia (>145 mEq/L)
FRIED SALT: Flushed skin, Restless/anxious/confused/irritable, Increased BP and fluid retention, Edema (pitting), Decreased UOP, Skin flushed and dry, Agitation, Low-grade fever, Thirst (dry mucous membranes)
S/S of hyponatremia (<135 mEq/L)
SALT LOSS: Stupor/coma, Anorexia (n/v), Lethargy, Tachycardia (thready pulse), Limp muscles, Orthostatic hypotension, Seizures/headache, Stomach cramping (hyperactive bowel sounds)
Hypernatremia risk factors
Increased sodium intake (oral, hypertonic fluids), loss of fluids (fever, v/d, DI, diaphoresis, infection), decreased sodium excretion (kidney problems)
Hyponatremia risk factors
4 D’s: diaphoresis, diarrhea/vomiting, drains (NGT suction), diuretics (loop & thiazide)
Other: SIADH, inadequate intake, kidney disease, HF
Hypernatremia management
IV infusions NS 0.9% (if d/t fluid loss), diuretics that promote sodium loss (loop and thiazide), restrict sodium and fluid as prescribed
Hyponatremia management
ADD SALT: Administer IV sodium chloride infusions (if d/t hypovolemia), 3% NS, Diuretics (if d/t hypervolemia), Daily weights, Safety (OHTN = risk for falls), Airway protection, Limit water intake, Teach about foods high in sodium (canned foods, packaged/processed meats)
Potassium and sodium are _________
Opposites; if Na is high K+ will be low (vice versa)
Role of potassium
Cellular metabolism and transition of nerve impulses, cardiac, lung, and muscle tissue function, acid-base balance
Normal potassium range
3.5-5 mEq/L
S/S of hyperkalemia (> 5 mEq/L)
MURDER: Muscle cramps and weakness, Urine abnormalities, Respiratory distress, Decreased cardiac contractility (low HR and BP), ECG changes, Reflexes (increased DTRs)
ECG changes related to hyperkalemia
Tall peaked T-waves, flat P waves, widened QRS, prolonged QT interval
S/S of hypokalemia
Thready/weak/irregular pulse, OHTN, shallow respirations, anxiety/lethargy/confusion/coma, paresthesias, hyporeflexia, constipation, N/V/abdominal distention, ECG changes
ECG changes related to hypokalemia
ST depression, shallow or inverted T-wave, prominent U wave
Potassium imbalance can cause
Cardiac dysrhythmias (can be life threatening!)
Hyperkalemia management
Monitor ECG, potassium-restricted diet, potassium excreting diuretics, IV calcium gluconate and IV sodium bicarb, avoid salt-substitutes
Hypokalemia management
Oral potassium supplements, spironolactone, liquid potassium chloride
Potassium is NEVER administered by
IV push, IM, or subq
How to administer IV potassium
Diluted and administered using an infusion device
Where is calcium found?
Cells, bones, and teeth
Electrolyte needed for proper functioning of the cardiovascular, neuromuscular, endocrine systems, blood clotting, and teeth formation
Calcium
Normal calcium range
9-11 mg/dL
S/S of hypercalcemia (> 11 mg/dL)
BACKME: Bone pain, Arrythmias, Cardiac arrest (bounding pulses), Kidney stones, Muscle weakness (decreased DTRs), Excessive urination, seizures
S/S of hypocalcemia
CATS GO NUMB: convulsions, arrythmias, tetany, spasms and stridor, numbness in fingers, face, and limbs
Carpal spasm caused by inflating a BP cuff; related to hypocalcemia
Positive Trousseau’s
Contraction of facial muscles with light tap over the facial muscle; related to hypocalcemia
Chvostek’s sign
A client with a calcium imbalance is at risk for
Pathological fracture (move them carefully and slowly!)
Hypercalcemia management
Administration of phosphorus, calcitonin, bisphosphonates, and prostaglandin synthesis inhibitors (NSAIDs), avoid foods high in calcium
Hypocalcemia management
Calcium PO or IV, aluminum chloride and vitamin D, seizure precautions, consume foods high in calcium
Calcium and phosphate are
Inverse; if Ca is high, PO4 is low (vice versa)
Most of the magnesium found in the body is found in the
Bones
Electrolyte that regulates BP, blood sugar, muscle contraction and nerve function
Magnesium
Normal magnesium range
1.5-2.5 mg/dL
S/S of hypermagnesemia (>2.5 mg/dL)
Low everything: energy, HR/BP/RR, bowel sound, DTRs
S/S of hypomagnesemia
High everything: HR/BP/DTRs, shallow respirations, twitches/paresthesias, tetany, seizures, irritability and confusion (may also see positive trousseau’s and Chvostek sign)
Hypermagnesemia management
Diuretics, IV calcium chloride or calcium gluconate, avoid laxatives and antacids containing mg
Hypomagnesemia management
IV or PO mag.sulfate, seizure precautions, increase magnesium-containing foods
Magnesium and calcium are
The same; if one is increased/decreased, so is the other
What electrolyte would you monitor for in a patient with thyroid disease?
Calcium
Describe what the blood is like when the serum osmolarity is >300
Concentrated
Most common electrolyte disorder
Hyponatremia
Tachycardia, flat neck veins, tachypnea, poor turgor, and decreased UOP are signs of
Dehydration
What is the most common route of potassium loss?
GI
Absorption of calcium requires
Vitamin D
What precautions would you place a patient with hypernatremia?
Seizure
In a patient with hypercalcemia, the blood will clot faster or slower?
Faster
What should you assess first with hypokalemia if the patient has a normal ECG?
Respiratory status
Example of potassium-sparing diuretic
Spironolactone
If a patient has hypophosphatemia, they will most likely have what other electrolyte imbalance?
Hypercalcemia
What should be the first assessment completed on a patient with hyperkalemia?
Cardiac
A nurse would expect an increased or decreased UOP with hypernatremia?
Decreased
Full and bounding pulse, HTN, JVD, dyspnea, crackles, pale and cool skin are S/S of
Over hydration or fluid overload
Which electrolyte maintains extracellular fluid?
Sodium
Which electrolytes maintain intracellular fluid?
Potassium and magnesium
Water goes with…
Sodium (were sodium goes, water flows)
What kind of fluid is normal saline?
Isotonic
Normal pH range
7.35-7.45
Low pH (<7.35)
Acidosis
High pH (>7.45)
Alkalosis
PaCO2 normal range
35-45
PaCO2 > 45
Acidosis
PaCO2 < 35
Alkalosis
HCO3 normal range
22-26
HCO3 < 22
Acidosis
HCO3 >26
Alkalosis