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100 Cards in this Set

  • Front
  • Back
What is the largest single component of the body?
water
What percentage of the average adult's weight is fluid?
60%
What are the two distinct body fluid compartments?
intracellular and extracellular
What is intracellular fluid? What percentage of body weight is ICF?
all fluids within body cells; 40%
What is extracellular?
all the fluid outside a cell
What are the three smaller compartments in extracellular fluid?
interstitial fluid, intravascular fluid and transcellular fluid
What is interstitial fluid?
contains lymph, is the fluid between the cells and outside the blood vessels.
What is intravascular fluid?
blood plasma
What is transcellular fluid?
consists of cerebrospinal, pleural, peritoneal, and synovial fluids
What percentage does extracellular fluid make up of the total body weight?
20%
What is cations?
positively charged electrolytes
What is anions?
negatively charged electrolytes
What are the cations?
sodium [Na+]; potassium [K+]; calcium [Ca++]; magnesium [Mg++]
What are the anions?
chloride [Cl-]; bicarbonate [HCO-]; phosphate [PO-]
What is osmosis?
the movement of a pure solvent, such as water, through a semipermeable membrane from an area of lesser solute concentration to an area of greater solute concentration in an attempt to equalize concentrations on both sides of the membrane
What is osmotic pressure?
is the drawing power for water and depends on the number of molecules in solution
What is osmolarity?
is the measure used to evaluate serum and urine in clincial practice.
What is hypertonic solution?
a solution of higher osmotic pressure, such as 3% soudium chloride, pulls fluid from cells causing them to shrink
What is isotonic solution?
a solution of same osmotic pressure, such as 0.9% sodium chloride, expands the body's fluid volume without causing a fluid shift from one compartment to another.
What is hypotonic solution?
a solution of lower osmotic pressure, such as 0.45% sodium chloride, moves fluid into the cells, causing them to enlarge
What is diffusion?
is the movement of a solute (gas or substance) in a solution across a semipermeable membrane from an area of higher concentration to an area of lower concentration.
What is flitration?
is the process by which water and diffusible substances move together in response to fluid pressure, moving from an area of higher pressure to one of lower pressure.
What is it called when there is an accumulation of excess fluid in the interstitial space?
edema
What is active transport?
requires metabolic activity and expenditure of energy to move materials across cell membrane.
What is homeostasis?
state of relative constancy in the internal environment of the body, maintained naturally by physiological adaptive mechanisms
Osmoreceptors
receptor that is sensitive to fluid concentration in the blood plasma and that regulates the secretion of antidiuretic hormone
Antidiuretic hormone (ADH)
substance stored in the posterior pituitary gland that is released in response to change in blood osmolarity
aldosterone
substance released by the adrenal cortex in response to increased plasma potassium levels or as a part of the renin-angiotensin-aldosterone mechanism to counteract hypovolemia
angiotensin
substance produced by renin that causes some vasoconstriction
insensible water loss
is continuous and is not perceived by the person but can increase significantly with fever or burns
sensible water loss
occurs through excess perspiration and can be perceived by the client or by the nurse through inspection
Four organs that fluid output occurs
kidneys, skin, lungs, and GI tract
What organ is the major regulatory of fluid balance?
kidneys
The kidneys receive ~ __ liter of plasma to filter each day and produce __ to __ ml of urine.
180 liters; 1200 to 1500 ml
An average of __ to __ ml of sensible and insensible fluid is lost via the skin each day.
500 to 600 ml
Electrolyte Distribution in Body Fluid: Normal ranges
Sodium: 135-145
Potassium: 3.5-5.0
Calcium: 4.5-5.5
Bicarbonate: 22-26 (aterial) 24-30 (venous)
Chloride: 90-110
Magnesium: 1.5-2.5
Phosphate: 1.7-4.6
What electrolyte is the most abundant in the ECF?
sodium
What major electrolyte and principle cation in the ICF?
potassium
Where is calcium stored? And how much is stored where?
bone, plasma, and body cells. 99% is located in bone, and only 1% is located in ECF.
Normal serum ionized calcium is what? Normal total calcium is what?
normal serum ionized calcium is 4.5 to 5.5 mEq/L. Normal total calcium is 8.5 to 10.5 mg/100 ml
Calcium is necessary for what?
bone and teeth formation, blood clotting, hormone secretion, cell membrane integrity, cardiac conduction, transmission of nerve impulses, and muscle contraction
What does sodium do?
maintaining water balance through their effect on serum osmolality, nerve impulse transmission, regulation of acid-base balance, and participation in cellular chemical reactions.
Sodium is regulated by what?
dietary intake and aldosterone secretion
What does potassium do?
it regulates many metabolic activities and is necessary for glycogen deposits in the liver and skeletal muscle, normal cardiac conduction, and skeletal and smooth muscle contraction.
Potassium is regulated by what?
dietary intake and renal excretion
What is magnesium for?
enzyme activities, neurochemical activities, and cardiac and skeletal muscle excitability.
What is magnesium regulated by?
dietary intake, renal mechanisms, and actions of the parathyroid hormone (PTH).
What electrolyte is the major anion in the ECF?
chloride
The transport of chloride follows what electrolyte?
sodium
Chloride is regulated how?
dietary intake and the kidneys
Which electrolyte is a major chemical base buffer within the body?
bicarbonate
What system regulates bicarbonate?
kidneys
Phosphate is what?
a buffer anion found primarily in ICF, with a small amount found in ECF
___ and ___ help to develop and maintain bones and teeth.
Phosphate and calcium
Calcium and phosphate are inversely proportional; if one rises what does the other one do?
the other falls
Phosphate promotes what?
normal neuromuscular action and participates in carbohydrate metabolism.
Phosphate is normally absorbed where?
through the GI tract
Phosphate is regulated how?
by dietary intake, renal excretion, intestinal absorption and PTH.
Buffer
is a substance or a group of substances that can absorb or release H+ to correct an acid-base imbalance
The basic types of fluid imbalances are what?
isotonic and osmolar
Isotonic deficit and excess exist when?
water and electrolytes are gained or lost in equal proportions
Osmolar imbalances exist when?
losses or excesses of only water so that the concentration (osmolality) of the serum if affected
Isotonic imbalance are considered what?
fluid volume deficit or fluid volume excess
Osmolar Imbalances are considered what?
Hyperosmolar imbalance-Dehydration
Hypoosmolar imbalance-Water Excess
Medications that causes Fluid, Electrolyte, and Acid-Base Disturbance
Diuretics-metabolic alkalosis, hyperkalemia, and hypokalemia; Steriods-metabolic alkalosis; Potassium supplements-GI disturbances, including intestinal and gastric ulcers and diarrhea; Respiratory center depressants-decreased rate and depth of respiration, resulting in respiratory acidosis
Medications that causes Fluid, Electrolyte, and Acid-Base Disturbance: Continued
Antibiotic-nephrotoxicity, hyperkalemia and/or hyponatremia; Calcium carbonate (TUMS)-mild metabolic alkalosis with nausea and vomiting; Magnesium hydroxide (milk of magnesia)-hypokalemia
Normal Anion Gap Values and Causes
12 (+/-2) mEq/L; Diarrhea, renal tubular acidosis, or pancreatic fistula causing a direct loss of HCO; addition of chloride-containing acids
Increased Anion Gap Values and Causes
>14 mEq/L; Lactic acidosis, uremia, diabetic ketoacidosis (DKA), or salicylate and methanol toxicity, resulting in accumulation of nonvolatile acids with decrease in HCO
Risk Factors for Fluid, Electrolyte, and Acid-Base Imbalances
Age: Very young; Very old
Chronic Diseases: Cancer; CHF; Cushing's disease and DM; malnutrition; COPD; Progressive renal failure; Changes in LOC
Risk Factors for Fluid, Electrolyte, and Acid-Base Imbalances: Continued
Trauma: Crush injuries; Head injuries, Burns
Therapies: Diuretics, Steriods, IV therapy, Total patenteral nutrition (TPN)
GI Losses: Gastroenteritis, Nasogastric suctioning, Fistulas
Anion gap
reflects unmeasurable anions present in plasma and is calculated by substracting the sum of chloride and bicarbonate from the amount of plasma sodium concentration
If there is a weight loss between 2% to 20%, what imbalance is it?
fluid volume deficit
If there is a weight gain between 2% to 8%, what imbalance is it?
fluid volume excess
If you have a history of headaches what imbalance could it be?
FVD; metabolic or respiratory acidosis; metabolic alkalosis
If you have a history of dizziness, what imbalance could it be?
FVD; respiratory acidosis or alkalosis, hyponatremia
If a nurse observes irritability, what imbalance could it be?
Metabolic or respiratory alkalosis, hyperosmolar imbalance, hypernatremia, hypokalemia
If a nurse observes lethargy, what imbalance could it be?
FVD; metabolic acidosis or alkalosis, respiratory acidosis, hypercalcemia
If a nurse observes confusion or disorientation, what imbalance could it be?
FVD; hypomagnesemia, metabolic acidosis, hypokalemia
If a client has sunken, dry conjunctivae, decreased or absent tearing, which imbalance is it?
FVD
If a client has periorbital edema and papilledema, which imbalance could it be?
FVE
If a client has a history of blurred vision, which imbalance could it be?
FVE
If a nurse inspects a client with sticky, dry mucous membranes, dry cracked lips, decreased salivation, which imbalance could it be?
FVD; hypernatremia
If a nurse inspects a client with flat neck veins or slow venous filling, which imbalance could it be?
FVD
If a client has distended neck veins, which imbalance could it be?
FVE
During palpation a nurse finds edema, which imbalance could it be?
FVE
If a client has dysrhythmias, which imbalance(s) could it be?
Metabolic acidosis, respiratory alkalosis and acidosis, potassium imbalance, hypomagnesemia
If a client has increased pulse rate, which imbalance(s) could it be?
Metabolic alkalosis, respiratory acidosis, hyponatremia, FVD, hypomagnesemia
If a client has deceased pulse rate, which imbalance(s) could it be?
Metabolic alkalosis, hypokalemia
If a client has a weak pulse, which imbalance(s) could it be?
FVD, Hypokalemia
If a client has a decreased capillary filling, which imbalance could it be?
FVD
If a client has a bounding pulse or third heart sound or hypertension, which imbalance could it be?
FVE
If a client has low BP or without orthostatic changes, which imbalance(s) could it be?
FVD, hyponatremia, hyperkalemia, hypermagnesemia
If a client has increased respiratory rate, which imbalance(s) could it be?
FVE, respiratory alkalosis, metabolic acidosis
If a client has either dyspnea or crackles, which imbalance could it be?
FVE
If a client has a history of either anorexia or abdominal cramps, which imbalance could it be?
metabolic acidosis
If a client has a sunken abdomen, which imbalance could it be?
FVD
If a client is having vomiting, which imbalance(s) could it be?
FVD, hypercalcemia, hyponatremia, hypochloremia, metabolic alkalosis
If a client is having diarrhea, which imbalance(s) could it be?
Hyponatremia, metabolic acidosis
If a client is experiencing oliguria or anuria, which imbalance(s) could it be?
FVD, FVE
If a client is experiencing diuresis (if kidneys are normal), which imbalance could it be?
FVE