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