Med srug 13: Fluid and Electrolytes: Balance and Disturbance Prepu

Which electrolyte is a major anion in body fluid? a) Sodium b) Potassium c) Chloride d) Calcium

c) Chloride Chloride is a major anion found in extracellular fluid. Potassium, sodium, and calcium are cations.

You are caring for a client with severe hypokalemia. The physician has ordered IV potassium to be administered at 10 mEq/hr. The client complains of burning along their vein. What should you do? a) Increase the speed of transfusion. b) Change the electrolyte. c) Dilute the infusion. d) Switch to an oral formulation.

c) Dilute the infusion. Treatment of severe hypokalemia requires treatment with IV infusion of potassium. Clients may experience burning along the vein with IV infusion of potassium in proportion to the infusion's concentration. If the client can tolerate the fluid, consult with the physician about diluting the potassium in a larger volume of IV solution. Oral potassium may not be enough in severe cases hypokalemia. Hypokalemia requires treatment with potassium and not any other electrolyte.

A nurse reviews the results of an electrocardiogram (ECG) for a patient who is being assessed for hypokalemia. Which of the following would the nurse notice as the most significant diagnostic indicator? a) Widened QRS wave b) Flat P wave c) Elevated U wave d) Peaked T wave

c) Elevated U wave An elevated U wave is specific for hypokalemia. Flat or inverted T waves may also be present. The other tracings are consistent with hyperkalemia.

Which is an insensible mechanism of fluid loss? a) Urination b) Bowel elimination c) Breathing d) Nausea

c) Breathing Insensible perspiration is a nonvisible form of water loss from the body. The lungs (breathing) eliminate water vapor creating an insensible loss.

Early signs of hypervolemia include a) moist breath sounds. b) increased breathing effort and weight gain. c) a decrease in blood pressure. d) thirst.

b) increased breathing effort and weight gain. Early signs of hypervolemia are weight gain, elevated blood pressure, and increased breathing effort. Eventually, fluid congestion in the lungs leads to moist breath sounds. One of the earliest symptoms of hypovolemia is thirst.

The weight of a client with congestive heart failure is monitored daily and entered into the medical record. In a 24-hour period, the client's weight increased by 2 lb. How much fluid is this client retaining? a) 1 L b) 500 ml c) 1500 ml d) 1250 ml

a) 1L A 2-lb weight gain in 24 hours indicates that the client is retaining 1L of fluid.

Air embolism is a potential complication of IV therapy. The nurse should be alert to which clinical manifestation associated with air embolism? a) Chest pain b) Hypertension c) Slow pulse d) Jaundice

a) Chest pain Manifestations of air embolism include dyspnea and cyanosis; hypotension; weak, rapid pulse; loss of consciousness; and chest, shoulder, and low back pain. Jaundice is not associated with air embolism.

A client is to receive hypotonic IV solution in order to provide free water replacement. Which solution does the nurse anticipate administering? a) Lactated Ringer solution b) 0.45% NaCl c) 0.9% NaCl d) 5% NaCl

b) 0.45% NaCl Half-strength saline (0.45%) is hypotonic. Hypotonic solutions are used to replace cellular fluid because it is hypotonic compared with plasma. Another is to provide free water to excrete body wastes. At times, hypotonic sodium solutions are used to treat hypernatremia and other hyperosmolar conditions. Lactated Ringer solution and normal saline (0.9% NaCl) are isotonic. A solution that is 5% NaCl is hypertonic.

Which solution is hypotonic? a) Lactated Ringer solution b) 0.45% NaCl c) 0.9% NaCl d) 5% NaCl

b) 0.45% NaCl Half-strength saline is hypotonic. Lactated Ringer solution and normal saline (0.9% NaCl) are isotonic. A 5% NaCl solution is hypertonic.

The nursing instructor is talking with her junior nursing class about fluid and electrolyte balance. What would the instructor tell her students is the average daily fluid intake for an adult? a) 2000 mL b) 2500 mL c) 3000 mL d) 3500 mL

b) 2500 mL In healthy adults, oral fluid intake averages about 2500 mL/day; however, it can range between 1800 to 3000 mL/day with a similar volume of fluid loss. Options A, C, and D are incorrect.

A client with cancer is being treated on the oncology unit for bilateral breast cancer. The client is undergoing chemotherapy. The nurse notes the client's serum calcium concentration is 12.3 mg/dL (3.08 mmol/L). Given this laboratory finding, the nurse should suspect that the a) client's diet is lacking in calcium-rich food products. b) malignancy is causing the electrolyte imbalance. c) client may be developing hyperaldosteronism. d) client has a history of alcohol abuse.

b) malignancy is causing the electrolyte imbalance. The client's laboratory findings indicate hypercalcemia. Hypercalcemia is defined as a calcium concentration >10.2 mg/dL (>2.6 mmol/L).The most common causes of hypercalcemia are malignancies and hyperparathyroidism. Malignant tumors can produce hypercalcemia through a variety of mechanisms. The client's calcium level is elevated; there is no indication that the client's diet is lacking in calcium-rich food products. Hyperaldosteronism is not associated with a calcium imbalance. Alcohol abuse is associated with hypocalcemia.

Which set of arterial blood gas (ABG) results requires further investigation? a) pH 7.38, partial pressure of arterial carbon dioxide (PaCO2) 36 mm b) Hg, partial pressure of arterial oxygen (PaO2) 95 mm Hg, bicarbonate (HCO3-) 24 mEq/L c) pH 7.49, PaCO2 30 mm Hg, PaO2 89 mm Hg, and HCO3- 18 mEq/L d) pH 7.44, PaCO2 43 mm Hg, PaO2 99 mm Hg, and HCO3- 26 mEq/L e) pH 7.35, PaCO2 40 mm Hg, PaO2 91 mm Hg, and HCO3- 22 mEq/L

c) pH 7.49, PaCO2 30 mm Hg, PaO2 89 mm Hg, and HCO3- 18 mEq/L The ABG results pH 7.49, PaCO2 30 mm Hg, PaO2 89 mm Hg, and HCO3- 18 mEq/L indicate respiratory alkalosis. The pH level is increased, and the HCO3- and PaCO2 levels are decreased. Normal values are pH 7.35 to 7.45; PaCO2 35 to 45 mm Hg; HCO3- 22 to 26 mEq/L.

A volume-depleted patient would present with which of the following diagnostic lab results? a) Urine specific gravity of 1.02 b) Urinary output of 1.2 L/24 hours c) Capillary refill time of 3 seconds d) BUN-to-creatinine ratio of 24:1

d) BUN-to-creatinine ratio of 24:1 A BUN-to-serum creatinine concentration ratio greater than 20:1 is indicative of volume depletion. The other results are within normal range.

A client with emphysema is at a greater risk for developing which acid-base imbalance? a) respiratory alkalosis b) metabolic alkalosis c) metabolic acidosis d) chronic respiratory acidosis

d) chronic respiratory acidosis Respiratory acidosis, which may be either acute or chronic, is caused by excess carbonic acid, which causes the blood pH to drop below 7.35. Chronic respiratory acidosis is associated with disorders such as emphysema, bronchiectasis, bronchial asthma, and cystic fibrosis.

A client is taking spironolactone to control hypertension. The client's serum potassium level is 6 mEq/L. What is the nurse's priority during assessment? a) neuromuscular function b) bowel sounds c) respiratory rate d) electrocardiogram (ECG) results

d) electrocardiogram (ECG) results Although changes in all these findings are seen in hyperkalemia, ECG results should take priority because changes can indicate potentially lethal arrhythmias such as ventricular fibrillation. It wouldn't be appropriate to assess the client's neuromuscular function, bowel sounds, or respiratory rate for effects of hyperkalemia.

A client with chronic renal failure has a serum potassium level of 6.8 mEq/L. What should the nurse assess first? a) Respirations b) pulse c) Temperature d) Blood pressure

B) Pulse An elevated serum potassium level may lead to a life-threatening cardiac arrhythmia, which the nurse can detect immediately by palpating the pulse. In addition to assessing the client's pulse, the nurse should place the client on a cardiac monitor because an arrythmia can occur suddenly. The client's blood pressure may change, but only as a result of the arrhythmia. Therefore, the nurse should assess blood pressure later. The nurse also may delay assessing respirations and temperature because these aren't affected by the serum potassium level.

The emergency department (ED) nurse is caring for a client with a possible acid-base imbalance. The physician has ordered an arterial blood gas (ABG). What is one of the most important indications of an acid-base imbalance that is shown in an ABG? a) Bicarbonate b) PO2 c) Carbonic acid d) PaO2

a) Bicarbonate Arterial blood gas (ABG) results are the main tool for measuring blood pH, CO2 content (PaCO2), and bicarbonate. An acid-base imbalance may accompany a fluid and electrolyte imbalance. PaO2and PO2 are not indications of acid-base imbalance. Carbonic acid levels are not shown in an ABG.

The physician has prescribed 0.9% sodium chloride IV for a hospitalized client in metabolic alkalosis. Which nursing actions are required to manage this client? Select all that apply. a) Compare ABG findings with previous results. b) Maintain intake and output records. c) Document presenting signs and symptoms. d) Administer IV bicarbonate. e) Suction the client's airway.

a) Compare ABG findings with previous results. b) Maintain intake and output records. c) Document presenting signs and symptoms. Metabolic alkalosis results in increased plasma pH because of accumulated base bicarbonate or decreased hydrogen ion concentrations. The result is retention of sodium bicarbonate and increased base bicarbonate. Nursing management includes documenting all presenting signs and symptoms to provide accurate baseline data, monitoring laboratory values, comparing ABG findings with previous results (if any), maintaining accurate intake and output records to monitor fluid status, and implementing prescribed medical therapy.

The nurse is caring for a client with a serum sodium concentration of 113 mEq/L (113 mmol/L). The nurse should monitor the client for the development of which condition? a) Confusion b) Headache c) Nausea d) Hallucinations

a) Confusion Normal serum concentration ranges from 135 to 145 mEq/L (135-145 mmol/L). Hyponatremia exists when the serum concentration decreases below 135 mEq/L (135 mmol/L). When the serum sodium concentration decreases to <115 mEq/L (<115 mmol/L), signs of increasing intracranial pressure, such as lethargy, confusion, muscle twitching, focal weakness, hemiparesis, papilledema, seizures, and death, may occur. General manifestations of hyponatremia include poor skin turgor, dry mucosa, headache, decreased saliva production, orthostatic fall in blood pressure, nausea, vomiting, and abdominal cramping. Neurologic changes, including altered mental status, status epilepticus, and coma, are probably related to cellular swelling and cerebral edema associated with hyponatremia. Hallucinations are associated with increased serum sodium concentrations.

The nurse is caring for a client with a serum sodium concentration of 113 mEq/L (113 mmol/L). The nurse should monitor the client for the development of which condition? a) Confusion b) Headache c) Nausea d) Hallucinations

a) Confusion Normal serum concentration ranges from 135 to 145 mEq/L (135-145 mmol/L). Hyponatremia exists when the serum concentration decreases below 135 mEq/L (135 mmol/L). When the serum sodium concentration decreases to <115 mEq/L (<115 mmol/L), signs of increasing intracranial pressure, such as lethargy, confusion, muscle twitching, focal weakness, hemiparesis, papilledema, seizures, and death, may occur. General manifestations of hyponatremia include poor skin turgor, dry mucosa, headache, decreased saliva production, orthostatic fall in blood pressure, nausea, vomiting, and abdominal cramping. Neurologic changes, including altered mental status, status epilepticus, and coma, are probably related to cellular swelling and cerebral edema associated with hyponatremia. Hallucinations are associated with increased serum sodium concentrations.

You are caring for a client with severe hypokalemia. The physician has ordered IV potassium to be administered at 10 mEq/hr. The client complains of burning along their vein. What should you do? a) Dilute the infusion. b) Switch to an oral formulation. c) Increase the speed of transfusion. d) Change the electrolyte.

a) Dilute the infusion. Treatment of severe hypokalemia requires treatment with IV infusion of potassium. Clients may experience burning along the vein with IV infusion of potassium in proportion to the infusion's concentration. If the client can tolerate the fluid, consult with the physician about diluting the potassium in a larger volume of IV solution. Oral potassium may not be enough in severe cases hypokalemia. Hypokalemia requires treatment with potassium and not any other electrolyte.

A client was admitted to the unit with a diagnosis of hypovolemia. When it is time to complete discharge teaching, which of the following will the nurse teach the client and family? Select all that apply. a) Drink at least eight glasses of fluid each day. b) Drink caffeinated beverages to retain fluid. c) Drink carbonated beverages to help balance fluid volume. d) Drink water as an inexpensive way to meet fluid needs. e) Respond to thirst

a) Drink at least eight glasses of fluid each day. d) Drink water as an inexpensive way to meet fluid needs. e) Respond to thirst In addition, the nurse teaches clients who have a potential for hypovolemia and their families to respond to thirst because it is an early indication of reduced fluid volume; consume at least 8 to 10 (8 ounce) glasses of fluid each day and more during hot, humid weather; drink water as an inexpensive means to meet fluid requirements; and avoid beverages with alcohol and caffeine because they increase urination and contribute to fluid deficits.

A nurse is caring for an adult client with numerous draining wounds from gunshots. The client's pulse rate has increased from 100 to 130 beats per minute over the last hour. The nurse should further assess the client for which of the following? a) Extracellular fluid volume deficit b) Altered blood urea nitrogen (BUN) value c) Metabolic alkalosis d) Respiratory acidosis

a) Extracellular fluid volume deficit Fluid volume deficit (FVD) occurs when the loss extracellular fluid (ECF) volume exceeds the intake of fluid. FVD results from loss of body fluids and occurs more rapidly when coupled with decreased fluid intake. A cause of this loss is hemorrhage.

The nurse is caring for a client undergoing alcohol withdrawal. Which serum laboratory value should the nurse monitor most closely? a) Magnesium b) Calcium c) Phosphorus d) Potassium

a) Magnesium Chronic alcohol abuse is a major cause of symptomatic hypomagnesemia in the United States. The serum magnesium concentration should be measured at least every 2 or 3 days in clients undergoing alcohol withdrawal. The serum magnesium concentration may be normal at admission but may decrease as a result of metabolic changes, such as the intracellular shift of magnesium associated with intravenous glucose administration.

The calcium concentration in the blood is regulated by which mechanism? a) Parathyroid hormone (PTH) b) Thyroid hormone (TH) c) Adrenal gland d) Androgens

a) Parathyroid hormone (PTH) The serum calcium concentration is controlled by PTH and calcitonin. The thyroid hormone, adrenal gland, or androgens do not regulate the calcium concentration in the blood.

The nurse is reviewing client lab work for a critical lab value. Which value is called to the physician for additional orders? a) Potassium: 5.8 mEq/L b) Sodium: 138 mEq/L c) Magnesium:2 mEq/L d) Calcium: 10 mg/dL

a) Potassium: 5.8 mEq/L Normal potassium level is approximately 3.5 to 5.0 mEq/L. Elevated potassium levels can lead to muscle weakness, paresthesias, and cardiac dysrhythmias.

The nurse is analyzing the electrocardiographic (ECG) rhythm tracing of a client experiencing hypercalcemia. Which ECG change is typically associated with this electrolyte imbalance? a) Prolonged PR intervals b) Prolonged QT intervals c) Peaked T waves d) Elevated ST segments

a) Prolonged PR intervals Cardiovascular changes associated with hypercalcemia may include a variety of dysrhythmias (e.g., heart blocks) and shortening of the QT interval and the ST segment. The PR interval is sometimes prolonged. The other changes are not associated with an elevated serum calcium concentration.

A nurse is caring for a client with acute renal failure and hypernatremia. In this case, which action can be delegated to the nursing assistant? a) Provide oral care every 2-3 hours. b) Monitor for signs and symptoms of dehydration. c) Teach the client about increased fluid intake. d) Assess the client's weight daily for trends.

a) Provide oral care every 2-3 hours. Providing oral care for the client every 2-3 hours is within the scope of practice of a nursing assistant. The other actions should be completed by the registered nurse.

Which medication does the nurse anticipate administering to antagonize the effects of potassium on the heart for a patient in severe metabolic acidosis? a) Sodium bicarbonate b) Magnesium sulfate c) Furosemide d) Calcium gluconate

a) Sodium bicarbonate IV administration of sodium bicarbonate may be necessary in severe metabolic acidosis to alkalinize the plasma, shift potassium into the cells, and furnish sodium to antagonize the cardiac effects of potassium.

A 54-year-old male patient is admitted to the hospital with a case of severe dehydration. The nurse reviews the patient's laboratory results. Which of the following results are consistent with the diagnosis? Select all that apply. a) Urine specific gravity of 1.03 b) Serum sodium of 148 mEq/L c) Serum osmolality of 310 mOsm/kg d) Blood urea nitrogen (BUN) of 23 mg/dL e) Serum glucose of 90 mg/dL f) Hematocrit level of 48%

a) Urine specific gravity of 1.03 b) Serum sodium of 148 mEq/L c) Serum osmolality of 310 mOsm/kg d) Blood urea nitrogen (BUN) of 23 mg/dL Severe dehydration is associated with an increased BUN (N = 10 to 20 mg/dL), serum osmolality (N = 275 to 300 mOsm/kg), serum sodium (N = 135 to 145 mEq/L) and urine specific gravity (N = 1.01 to 1.025). Glucose and hematocrit levels would also be elevated but are within normal range for this question.

A client with emphysema is at a greater risk for developing which acid-base imbalance? a) chronic respiratory acidosis b) metabolic alkalosis c) metabolic acidosis d) respiratory alkalosis

a) chronic respiratory acidosis Respiratory acidosis, which may be either acute or chronic, is caused by excess carbonic acid, which causes the blood pH to drop below 7.35. Chronic respiratory acidosis is associated with disorders such as emphysema, bronchiectasis, bronchial asthma, and cystic fibrosis.

A client with severe hypervolemia is prescribed a loop diuretic and the nurse is concerned with the client experiencing significant sodium and potassium losses. What drug was most likely prescribed? a) furosemide b) hydrochlorothiazide c) metolazone d) spironolactone

a) furosemide Furosemide is the only loop diuretic choice. Hydrochlorothiazide and metolazone are thiazide diuretics that block sodium reabsorption. Spironolactone is a potassium-sparing diuretic that prevents sodium absorption.

A client reports muscle cramps in the calves and feeling "tired a lot." The client is taking ethacrynic acid (Edecrin) for hypertension. Based on these symptoms, the client will be evaluated for which electrolyte imbalance? a) hypokalemia b) hyperkalemia c) hypocalcemia d) hypercalcemia

a) hypokalemia Hypokalemia causes fatigue, weakness, anorexia, nausea, vomiting, cardiac dysrhythmias, leg cramps, muscle weakness, and paresthesias. Many diuretics, such as ethacrynic acid (Edecrin), also waste potassium. Symptoms of hyperkalemia include diarrhea, nausea, muscle weakness, paresthesias, and cardiac dysrhythmias. Signs of hypocalcemia include tingling in the extremities and the area around the mouth and muscle and abdominal cramps. Hypercalcemia causes deep bone pain, constipation, anorexia, nausea, vomiting, polyuria, thirst, pathologic fractures, and mental changes.

A client with cancer is being treated on the oncology unit for bilateral breast cancer. The client is undergoing chemotherapy. The nurse notes the client's serum calcium concentration is 12.3 mg/dL (3.08 mmol/L). Given this laboratory finding, the nurse should suspect that the a) malignancy is causing the electrolyte imbalance. b) client's diet is lacking in calcium-rich food products. c) client may be developing hyperaldosteronism. d) client has a history of alcohol abuse.

a) malignancy is causing the electrolyte imbalance. The client's laboratory findings indicate hypercalcemia. Hypercalcemia is defined as a calcium concentration >10.2 mg/dL (>2.6 mmol/L).The most common causes of hypercalcemia are malignancies and hyperparathyroidism. Malignant tumors can produce hypercalcemia through a variety of mechanisms. The client's calcium level is elevated; there is no indication that the client's diet is lacking in calcium-rich food products. Hyperaldosteronism is not associated with a calcium imbalance. Alcohol abuse is associated with hypocalcemia.

A client has been admitted to the hospital unit with signs and symptoms of hypovolemia; however, the client has not lost weight. The client exhibits a localized enlargement of her abdomen. What condition could the client be presenting? a) third-spacing b) pitting edema c) anasarca d) hypovolemia

a) third-spacing Third-spacing describes the translocation of fluid from the intravascular or intercellular space to tissue compartments, where it becomes trapped and useless. The client manifests signs and symptoms of hypovolemia with the exception of weight loss. There may be signs of localized enlargement of organ cavities (such as the abdomen) if they fill with fluid, a condition referred to as ascites. Pitting edema occurs when indentations remain in the skin after compression. Anasarca is another term for generalized edema, or brawny edema, in which the interstitial spaces fill with fluid. Hypovolemia (fluid volume deficit) refers to a low volume of extracellular fluid.

A client is diagnosed with hypocalcemia and the nurse is teaching the client about symptoms. What symptom would the nurse include in the teaching? a) tingling sensation in the fingers b) polyuria c) flank pain d) hypertension

a) tingling sensation in the fingers Tingling or numbness in the fingers is a symptom of hypocalcemia. Flank pain, polyuria, and hypertension are symptoms of hypercalcemia.

A patient's serum sodium concentration is within the normal range. What should the nurse estimate the serum osmolality to be? a) <136 mOsm/kg b) 275-300 mOsm/kg c) >408 mOsm/kg d) 350-544 mOsm/kg

b) 275-300 mOsm/kg In healthy adults, normal serum osmolality is 270 to 300 mOsm/kg (Crawford & Harris, 2011c).

The nurse is caring for a 72-year-old client who has been admitted to the unit for a fluid volume imbalance. The nurse knows which of the following is the most common fluid imbalance in older adults? a) Hypovolemia b) Dehydration c) Hypervolemia d) Fluid volume excess

b) Dehydration The most common fluid imbalance in older adults is dehydration. Because of reduced thirst sensation that often accompanies aging, older adults tend to drink less water. Use of diuretic medications, laxatives, or enemas may also deplete fluid volume in older adults. Chronic fluid volume deficit can lead to other problems such as electrolyte imbalances.

The nurse is assigned to care for a client with a serum phosphorus concentration of 5.0 mg/dL (1.61 mmol/L). The nurse anticipates that the client will also experience which electrolyte imbalance? a) Hyperchloremia b) Hypocalcemia c) Hypermagnesemia d) Hyponatremia

b) Hypocalcemia The client is experiencing an elevated serum phosphorus concentration. Hyperphosphatemia is defined as a serum phosphorus that exceeds 4.5 mg/dL (1.45 mmol/L). Because of the reciprocal relationship between phosphorus and calcium, a high serum phosphorus concentration tends to cause a low serum calcium concentration.

An elderly client takes 40 mg of furosemide twice a day. Which electrolyte imbalance is the most serious adverse effect of diuretic use? a) Hyperkalemia b) Hypokalemia c) Hypernatremia d) Hypophosphatemia

b) Hypokalemia Hypokalemia (potassium level below 3.5 mEq/L) usually indicates a deficit in total potassium stores. Potassium-losing diuretics, such as furosemide, can induce hypokalemia. Hyperkalemia refers to increased potassium levels. Loop diuretics can bring about lower sodium levels, not hypernatremia. Furosemide does not affect phosphorus levels.

Which intervention is most appropriate for a client with an arterial blood gas (ABG) of pH 7.5, a partial pressure of arterial carbon dioxide (PaCO2) of 26 mm Hg, oxygen (O2) saturation of 96%, bicarbonate (HCO3-) of 24 mEq/L, and a PaO2 of 94 mm Hg? a) Administer an ordered decongestant. b) Instruct the client to breathe into a paper bag. c) Offer the client fluids frequently. d) Administer ordered supplemental oxygen.

b) Instruct the client to breathe into a paper bag. The ABG results reveal respiratory alkalosis. The best intervention to raise the PaCO2 level would be to have the client breathe into a paper bag. Administering a decongestant, offering fluids frequently, and administering supplemental oxygen wouldn't raise the lowered PaCO2 level.

A client in the emergency department reports that he has been vomiting excessively for the past 2 days. His arterial blood gas analysis shows a pH of 7.50, partial pressure of arterial carbon dioxide (PaCO2) of 43 mm Hg, partial pressure of arterial oxygen (PaO2) of 75 mm Hg, and bicarbonate (HCO3-) of 42 mEq/L. Based on these findings, the nurse documents that the client is experiencing which type of acid-base imbalance? a) Respiratory alkalosis b) Metabolic alkalosis c) Respiratory acidosis d) Metabolic acidosis

b) Metabolic alkalosis A pH over 7.45 with a HCO3- level over 26 mEq/L indicates metabolic alkalosis. Metabolic alkalosis is always secondary to an underlying cause and is marked by decreased amounts of acid or increased amounts of base HCO3-. The client isn't experiencing respiratory alkalosis because the PaCO2 is normal. The client isn't experiencing respiratory or metabolic acidosis because the pH is greater than 7.35.

The nurse on a surgical unit is caring for a client recovering from recent surgery with the placement of a nasogastric tube to low continuous suction Which acid-base imbalance is most likely to occur? a) Respiratory alkalosis b) Metabolic alkalosis c) Respiratory acidosis d) Metabolic acidosis

b) Metabolic alkalosis Metabolic alkalosis results in increased plasma pH because of an accumulated base bicarbonate or decreased hydrogen ion concentration. Factors that increase base bicarbonate include excessive oral or parenteral use of bicarbonate-containing drugs, a rapid decrease in extracellular fluid volume and loss of hydrogen and chloride ions as with gastric suctioning. Acidotic states are from excess carbonic acid and hydrogen ions in the system. Respiratory alkalosis results from a carbonic acid deficit that occurs when rapid breathing releases more CO2 than necessary.

A nurse in the Medical ICU has orders to infuse a hypertonic solution into a patient with low blood pressure. This solution will increase the number of dissolved particles in the patient's blood, creating pressure for fluids in the tissues to shift into the capillaries and increase the blood volume. What term or terms are associated with this process? a) Hydrostatic pressure b) Osmosis and osmolality c) Diffusion d) Active transport

b) Osmosis and osmolality Osmosis is the movement of fluid from a region of low solute concentration to the region of high solute concentration across a semipermeable membrane. The number of dissolved particles contained in a unit of fluid determines the osmolality of a solution, which influences the movement of fluid between the fluid compartments. Giving a patient who has low blood pressure a hypertonic solution will increase the number of dissolved particles in the blood, creating pressure for fluids in the tissues to shift into the capillaries and increase the blood volume. Hydrostatic pressure refers to changes in water or volume related to water pressure. Diffusion is the movement of solutes from an area of greater concentration to lesser concentration; the solutes in an intact vascular system are unable to move, so diffusion should not be normally taking place. Active transport is the movement of molecules against the concentration gradient and requires adenosine triphosphate (ATP) as an energy source; this process typically takes place at the cellular level and is not involved in vascular volume changes.

A nurse is caring for a client with acute renal failure and hypernatremia. In this case, which action can be delegated to the nursing assistant? a) Monitor for signs and symptoms of dehydration. b) Provide oral care every 2-3 hours. c) Assess the client's weight daily for trends. d) Teach the client about increased fluid intake.

b) Provide oral care every 2-3 hours. Providing oral care for the client every 2-3 hours is within the scope of practice of a nursing assistant. The other actions should be completed by the registered nurse.

A patient with a history of poorly controlled type 1 diabetes has begun displaying the characteristic signs and symptoms of diabetic nephropathy. The patient's nurse recognizes that the patient is at risk of disruptions to fluid balance. What role do the kidneys play in the maintenance of normal fluid balance? a ) Synthesizing and releasing angiotensin in cases of fluid volume deficit b) Selectively retaining needed substances and excreting waste products c) Secreting or withholding antidiuretic hormone in response to extracellular fluid volume d) Maintaining the correct concentration of H+ ions in the blood

b) Selectively retaining needed substances and excreting waste products Major functions of the kidneys in maintaining normal fluid balance include regulation of extracellular fluid (ECF) volume and osmolality by selective retention and excretion of body fluids and regulation of electrolyte levels in the ECF by selective retention of needed substances and excretion of unneeded substances. Antidiuretic hormone (ADH) is secreted by the pituitary gland, and angiotensin is ultimately derived from the liver, not the kidneys. Concentration of H+ ions contributes the buffer action of the kidneys, not the maintenance of fluid balance.

A patient with a history of poorly controlled type 1 diabetes has begun displaying the characteristic signs and symptoms of diabetic nephropathy. The patient's nurse recognizes that the patient is at risk of disruptions to fluid balance. What role do the kidneys play in the maintenance of normal fluid balance? a) Secreting or withholding antidiuretic hormone in response to extracellular fluid volume b) Selectively retaining needed substances and excreting waste products c) Synthesizing and releasing angiotensin in cases of fluid volume deficit d) Maintaining the correct concentration of H+ ions in the blood

b) Selectively retaining needed substances and excreting waste products Major functions of the kidneys in maintaining normal fluid balance include regulation of extracellular fluid (ECF) volume and osmolality by selective retention and excretion of body fluids and regulation of electrolyte levels in the ECF by selective retention of needed substances and excretion of unneeded substances. Antidiuretic hormone (ADH) is secreted by the pituitary gland, and angiotensin is ultimately derived from the liver, not the kidneys. Concentration of H+ ions contributes the buffer action of the kidneys, not the maintenance of fluid balance.

A client reports muscle cramps in the calves and feeling "tired a lot." The client is taking ethacrynic acid (Edecrin) for hypertension. Based on these symptoms, the client will be evaluated for which electrolyte imbalance? a) hyperkalemia b) hypokalemia c) hypocalcemia d) hypercalcemia

b) hypokalemia Hypokalemia causes fatigue, weakness, anorexia, nausea, vomiting, cardiac dysrhythmias, leg cramps, muscle weakness, and paresthesias. Many diuretics, such as ethacrynic acid (Edecrin), also waste potassium. Symptoms of hyperkalemia include diarrhea, nausea, muscle weakness, paresthesias, and cardiac dysrhythmias. Signs of hypocalcemia include tingling in the extremities and the area around the mouth and muscle and abdominal cramps. Hypercalcemia causes deep bone pain, constipation, anorexia, nausea, vomiting, polyuria, thirst, pathologic fractures, and mental changes.

Following a unilateral adrenalectomy, a nurse should assess for hyperkalemia as indicated by: a) constipation. b) muscle weakness. c) diaphoresis. d) tremors.

b) muscle weakness. Muscle weakness; bradycardia; nausea; diarrhea; and paresthesia of the hands, feet, tongue, and face are findings associated with hyperkalemia, which results from transient hypoaldosteronism when the adenoma is removed. Tremors, diaphoresis, and constipation aren't seen in hyperkalemia.

When evaluating arterial blood gases (ABGs), which value is consistent with metabolic alkalosis? a) HCO 21 mEq/L b) pH 7.48 c) PaCO 36 d) O saturation 95%

b) pH 7.48 Metabolic alkalosis is a clinical disturbance characterized by a high pH and high plasma bicarbonate concentration. The HCO value is below normal. The PaCO value and the oxygen saturation level are within a normal range.

Hypomagnesemia is a common yet often overlooked imbalance in acutely and critically ill patients. Which of the following patients is most likely at the highest risk of experiencing low serum magnesium levels? a) An obese male patient who has a history of atherosclerosis and a previous non-ST wave elevation myocardial infarction b) A patient who is temporarily receiving total parenteral nutrition (TPN) as a result of complications from gastric bypass surgery c) A female patient who has liver cirrhosis and who is experiencing withdrawal from heavy alcohol use d) A teenage patient who is currently being treated for non-Hodgkin's lymphoma (NHL)

c) A female patient who has liver cirrhosis and who is experiencing withdrawal from heavy alcohol use Alcoholism is currently the most common cause of symptomatic hypomagnesemia in the United States. Hypomagnesemia is particularly troublesome during treatment of alcohol withdrawal. Therefore, the serum magnesium level should be routinely measured in patients undergoing withdrawal from alcohol. TPN, heart disease, and lymphoma are not identified as central risk factors for the development of hypomagnesemia.

The Emergency Department (ED) nurse is caring for a client with a possible acid-base imbalance. The physician has ordered an arterial blood gas (ABG). What is one of the most important indications of an acid-base imbalance that is shown in an ABG? a) Carbonic acid b) PO2 c) Bicarbonate d) PaO2

c) Bicarbonate Arterial blood gas (ABG) results are the main tool for measuring blood pH, CO2 content (PaCO2), and bicarbonate. An acid-base imbalance may accompany a fluid and electrolyte imbalance. PaO2and PO2 are not indications of acid-base imbalance. Carbonic acid levels are not shown in an ABG.

A client reports tingling in the fingers as well as feeling depressed. The nurse assesses positive Trousseau's and Chvostek's signs. Which decreased laboratory results does the nurse observe when the client's laboratory work has returned? a) Potassium b) Phosphorus c) Calcium d) Iron

c) Calcium Calcium deficit is associated with the following symptoms: numbness and tingling of the fingers, toes, and circumoral region; positive Trousseau's sign and Chvostek's sign; seizures, carpopedal spasms, hyperactive deep tendon reflexes, irritability, bronchospasm, anxiety, impaired clotting time, decreased prothrombin, diarrhea, and hypotension. Electrocardiogram findings associated with hypocalcemia include prolonged QT interval and lengthened ST.

Which laboratory result does the nurse identify as a direct result of the client's hypovolemic status with hemoconcentration? a) Low urine specific gravity b) Abnormal potassium level c) Elevated hematocrit level d) Low white blood count

c) Elevated hematocrit level When hemoconcentration occurs due to a hypovolemic state, a high ratio of blood components in relation to watery plasma occurs, thus causing an elevated hematocrit level. A high white blood cell count and urine specific gravity is also noted. Other causes of an abnormal potassium level may be present.

The nurse is caring for a client with multiple organ failure and in metabolic acidosis. Which pair of organs is responsible for regulatory processes and compensation? a) Kidney and liver b) Heart and lungs c) Lungs and kidney d) Pancreas and stomach

c) Lungs and kidney The lungs and kidneys facilitate the ratio of bicarbonate to carbonic acid. Carbon dioxide is one of the components of carbonic acid. The lungs regulate carbonic acid levels by releasing or conserving CO2 by increasing or decreasing the respiratory rate. The kidneys assist in acid-base balance by retaining or excreting bicarbonate ions.

A nurse is caring for a client admitted with a diagnosis of exacerbation of myasthenia gravis. Upon assessment of the client, the nurse notes the client has severely depressed respirations. The nurse would expect to identify which acid-base disturbance? a) Metabolic acidosis b) Metabolic alkalosis c) Respiratory acidosis d) Respiratory alkalosis

c) Respiratory acidosis Respiratory acidosis is always from inadequate excretion of CO2 with inadequate ventilation, resulting in elevated plasma CO2 concentrations. Respiratory acidosis can occur in diseases that impair respiratory muscles such as myasthenia gravis.

You notify the physician that your client is third-spacing fluid. What orders would you expect the physician to give you? a) Restrict fluids b) Administer diuretics c) Start IV fluids and blood products d) Increase sodium in diet

c) Start IV fluids and blood products This is done by administering IV solutions—sometimes at rapid rates—and blood products, such as albumin, to restore colloidal osmotic pressure. The restriction of fluids; the administration of diuretics and the increase of sodium in the diet are not orders the physician would be expected to give for a client is third-spacing fluids.

A nurse is caring for a client in acute renal failure. The nurse should expect hypertonic glucose, insulin infusions, and sodium bicarbonate to be used to treat: a) hypernatremia b) hypokalemia c) hyperkalemia d) hypercalcemia

c) hyperkalemia Hyperkalemia is a common complication of acute renal failure. It's life-threatening if immediate action isn't taken to reverse it. Administering glucose and regular insulin, with sodium bicarbonate if necessary, can temporarily prevent cardiac arrest by moving potassium into the cells and temporarily reducing serum potassium levels. Hypernatremia, hypokalemia, and hypercalcemia don't usually occur with acute renal failure and aren't treated with glucose, insulin, or sodium bicarbonate.

A client weighing 160.2 pounds (72.7 kg), who has been diagnosed with hypovolemia, is weighed every day. The health care provider asked to be notified if the client loses 1,000 mL of fluid in 24 hours. What weight would be consistent with this amount of fluid loss? a)156.0 lbs (70.8 kg) b) 157.0 lbs (71.2 kg) c) 158.0 lbs (71.7 kg) d)159.0 lbs (72.1 kg)

c)158.0 lbs (71.7 kg) A loss of 0.5 kg, or 1.1 lb, represents a fluid loss of about 500 mL. Therefore, a loss of 1,000 mL would be equivalent to the loss of 2.2 lbs (1 kg), bringing the client's weight to 158.0 lbs (71.7 kg).

A client who is semiconscious presents with restlessness and weakness. The nurse assesses a dry, swollen tongue; body temperature of 99.3 °F; and a urine specific gravity of 1.020. What is the most likely serum sodium value for this client? a) 130 mEq/L b) 110 mEq/L c) 145 mEq/L d) 165 mEq/L

d) 165 mEq/L The normal sodium level is 135- 145 mEq/L (135-145 mmol/L). In hypernatremia, the serum sodium level exceeds 145 mEq/L (145 mmol/L) and the serum osmolality exceeds 300 mOsm/kg (300 mmol/L). The urine specific gravity and urine osmolality are increased as the kidneys attempt to conserve water (provided the water loss is from a route other than the kidneys). Body temperature may increase mildly, but it returns to normal after the hypernatremia is corrected.

A patient is admitted with a diagnosis of renal failure. The patient complains of "stomach distress" and describes ingesting several antacid tablets over the past 2 days. Blood pressure is 110/70 mm Hg, face is flushed, and the patient is experiencing generalized weakness. Which is the most likely magnesium level associated with the symptoms the patient is having? a) 1 mEq/L b) 11 mEq/L c) 2 mEq/L d) 5 mEq/L

d) 5 mEq/L Magnesium excess (>2.7 mEq/L) is associated with the following symptoms: flushing, hypotension, muscle weakness, drowsiness, hypoactive reflexes, depressed respirations, and cardiac arrest. The respiratory center is depressed when serum magnesium levels exceed 10 mEq/L (5 mmol/L). This is not present in this patient, so the magnesium level is unlikely to be 11 mEq/L. Coma, atrioventricular heart block, and cardiac arrest can occur when the serum magnesium level is greatly elevated and not treated.

The emergency department (ED) nurse is caring for a client with a possible acid-base imbalance. The physician has ordered an arterial blood gas (ABG). What is one of the most important indications of an acid-base imbalance that is shown in an ABG? a) PaO2 b) PO2 c) Carbonic acid d) Bicarbonate

d) Bicarbonate Arterial blood gas (ABG) results are the main tool for measuring blood pH, CO2 content (PaCO2), and bicarbonate. An acid-base imbalance may accompany a fluid and electrolyte imbalance. PaO2 and PO2 are not indications of acid-base imbalance. Carbonic acid levels are not shown in an ABG.

A patient with a diagnosis of colon cancer has undergone a bowel resection with the creation of an ileostomy. The patient's ileostomy output has been unexpectedly high in the 2 days since surgery, and the patient's most recent blood work indicates a K+ level of 2.7 mEq/L. This potassium level should prompt the nurse to assess for which of the following physical manifestations? a) Confusion and decreased level of consciousness b) Shortness of breath, rales, and peripheral edema c) Dysphagia, tetany, and emotional lability d) Fatigue, cramps, and weakness

d) Fatigue, cramps, and weakness A serum potassium level of 2.7 mEq/L constitutes hypokalemia. Manifestations of hypokalemia include fatigue, anorexia, nausea, vomiting, muscle weakness, leg cramps, decreased bowel motility, paresthesias (numbness and tingling), arrhythmias, and increased sensitivity to digitalis. Respiratory symptoms, dysphagia, and tetany are not typically associated with hypokalemia.

A nurse is assessing a client with syndrome of inappropriate antidiuretic hormone. Which finding requires further action? a) Polyuria b) Weight loss c) Tetanic contractions d) Jugular vein distention

d) Jugular vein distention Jugular vein distention requires further action because this finding signals vascular fluid overload. Tetanic contractions aren't associated with this disorder, but weight gain and fluid retention from oliguria are. Polyuria is associated with diabetes insipidus, which occurs with inadequate production of antidiuretic hormone.

A client has been diagnosed with an intestinal obstruction and has a nasogastric tube set to low continuous suction. Which acid-base disturbance is this client at risk for developing? a) Respiratory acidosis b) Respiratory alkalosis c) Metabolic acidosis d) Metabolic alkalosis

d) Metabolic alkalosis Metabolic alkalosis is a clinical disturbance characterized by a high pH and a high plasma bicarbonate concentration. The most common cause of metabolic alkalosis is vomiting or gastric suction with loss of hydrogen and chloride ions. Gastric fluid has an acid pH, and loss of this acidic fluid increases the alkalinity of body fluids.

A client with pancreatic cancer has the following blood chemistry profile: Glucose, fasting: 204 mg/dl; blood urea nitrogen (BUN): 12 mg/dl; Creatinine: 0.9 mg/dl; Sodium: 136 mEq/L; Potassium: 2.2 mEq/L; Chloride: 99 mEq/L; CO2: 33 mEq/L. Which result should the nurse identify as critical and report immediately? a) CO2 b) Sodium c) Chloride d) Potassium

d) Potassium The nurse should identify potassium: 2.2 mEq/L as critical because a normal potassium level is 3.5 to 5.0 mEq/L. Severe hypokalemia can cause cardiac and respiratory arrest, possibly leading to death. Hypokalemia also depresses the release of insulin and results in glucose intolerance. The glucose level is above normal (normal is about 75 to 110 mg/dl), and the chloride level is a bit low (normal is about 100 to 110 mEq/L). Although these levels should be reported, neither is life-threatening. The BUN (normal is ~ 8 to 26 mg/dl) and creatinine (normal is ~ 0.8 to 1.4 mg/dl) are within normal range.

A nurse reviews the arterial blood gas (ABG) values of a client admitted with pneumonia: pH, 7.51; PaCO2, 28 mm Hg; PaO2, 70 mm Hg; and HCO3--, 24 mEq/L. What do these values indicate? a) Metabolic acidosis b) Metabolic alkalosis c) Respiratory acidosis d) Respiratory alkalosis

d) Respiratory alkalosis A client with pneumonia may hyperventilate in an effort to increase oxygen intake. Hyperventilation leads to excess carbon dioxide (CO2) loss, which causes alkalosis — indicated by this client's elevated pH value. With respiratory alkalosis, the kidneys' bicarbonate (HCO3-) response is delayed, so the client's HCO3- level remains normal. The below-normal value for the partial pressure of arterial carbon dioxide (PaCO2) indicates CO2 loss and signals a respiratory component. Because the HCO3- level is normal, this imbalance has no metabolic component. Therefore, the client is experiencing respiratory alkalosis.

client is diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH). Laboratory results reveal serum sodium level 130 mEq/L and urine specific gravity 1.030. Which nursing intervention helps prevent complications associated with SIADH? a) Administering vasopressin as ordered b) Restricting sodium intake to 1 gm/day c) Elevating the head of the client's bed to 90 degrees d) Restricting fluids to 800 ml/d

d) Restricting fluids to 800 ml/d Excessive release of antidiuretic hormone (ADH) disturbs fluid and electrolyte balance in SIADH. The excessive ADH causes an inability to excrete dilute urine, retention of free water, expansion of extracellular fluid volume, and hyponatremia. Symptomatic treatment begins with restricting fluids to 800 ml/day. Vasopressin is administered to clients with diabetes insipidus a condition in which circulating ADH is deficient. Elevating the head of the bed decreases vascular return and decreases atrial-filling pressure, which increases ADH secretion, thus worsening the client's condition. The client's sodium is low and, therefore, shouldn't be restricted.

A client is taking spironolactone to control hypertension. The client's serum potassium level is 6 mEq/L. What is the nurse's priority during assessment? a) neuromuscular function b) bowel sounds c) respiratory rate d) electrocardiogram (ECG) results

d) electrocardiogram (ECG) results Although changes in all these findings are seen in hyperkalemia, ECG results should take priority because changes can indicate potentially lethal arrhythmias such as ventricular fibrillation. It wouldn't be appropriate to assess the client's neuromuscular function, bowel sounds, or respiratory rate for effects of hyperkalemia.