Chapter 13 Prep U Electrolytes

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?

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

A volume-depleted patient would present with which of the following diagnostic lab results?

BUN-to-creatinine ratio of 24:1 Explanation: A BUN-to-serum creatinine concentration ratio greater than 20:1 is indicative of volume depletion.

Which laboratory result does the nurse identify as a direct result of the client's hypovolemic status with hemoconcentration?

Elevated hematocrit level Explanation: 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

You are caring for a new client on your unit who is third-spacing fluid. You know to assess for what type of edema?

Generalized Explanation: There may be generalized edema in all the interstitial spaces, which sometimes is called brawny edema or anasarca.

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?

Provide oral care every 2-3 hours. Explanation: Providing oral care for the client every 2-3 hours is within the scope of practice of a nursing assistant.

Which of the following is a function of calcitonin? Select all that apply.

Reduces bone resorption Increases urinary excretion of calcium Increases deposition of calcium in bones Explanation: Calcitonin reduces bones resorption, increasing deposition of calcium and phosphorous in the bones, and increases urinary excretion of calcium and phosphate.

A client with nausea, vomiting, and abdominal cramps and distention is admitted to the health care facility. Which test result is most significant?

Serum potassium level of 3 mEq/L Explanation: A serum potassium level of 3 mEq/L is below normal, indicating hypokalemia. Because hypokalemia may cause cardiac arrhythmias and asystole, it's the most significant finding. In a client with a potential fluid volume imbalance, such as from vomiting, the other options are expected but none are as life-threatening as hypokalemia

Which of the following is a factor affecting an increase in urine osmolality?

Syndrome of inappropriate antidiuretic hormone release (SIADH) Explanation: Factors increasing urine osmolality include SIADH, fluid volume deficit, acidosis, and congestive heart failure.

The nurse is caring for a client undergoing alcohol withdrawal. Which serum laboratory value should the nurse monitor most closely?

Magnesium Explanation: 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.

Which arterial blood gas (ABG) result would the nurse anticipate for a client with a 3-day history of vomiting?

pH: 7.55, PaCO2: 60 mm Hg, HCO3-: 28 Explanation: The client's ABG would likely demonstrate metabolic alkalosis. Metabolic alkalosis is a clinical disturbance characterized by a high pH (decreased H+ concentration) and a high plasma bicarbonate concentration. It can be produced by a gain of bicarbonate or a loss of H+. A common cause of metabolic alkalosis is vomiting or gastric suction with loss of hydrogen and chloride ions. The disorder also occurs in pyloric stenosis, where only gastric fluid is lost.

A client has a respiratory rate of 38 breaths/min. What effect does breathing faster have on arterial pH level?

Increases arterial pH Explanation: Respiratory alkalosis is always caused by hyperventilation, which is a decrease in plasma carbonic acid concentration. The pH is elevated above normal as a result of a low PaCO2.

Which condition leads to chronic respiratory acidosis in older adults?

Thoracic skeletal change Explanation: Poor respiratory exchange as the result of chronic lung disease, inactivity, or thoracic skeletal changes may lead to chronic respiratory acidosis

A nurse is monitoring a client being evaluated who has a potassium level of 7 mEq/L (mmol/L). Which electrocardiogram changes will the client display?

peaked T waves Explanation: The earliest changes occur when the serum potassium level is 7 mEq/L (mmol/L). Cardiac tracings include peaked and narrow T waves, ST segment depression, and a shortened QT interval.

Your client's lab values are sodium 166 mEq/L, potassium 5.0 mEq/L, chloride 115 mEq/L, and bicarbonate 35 mEq/L. What condition is this client likely to have, judging by anion gap?

Metabolic Acidosis

Which of the following measurable urine outputs indicates the client is maintaining adequate fluid intake and balance?

A patient with a minimal urine output of 30 mL/hour Explanation: A client with minimal urine output of 30 mL/hour provides the nurse with the information that the patient is maintaining proper fluid balance. Less then 30 mL/hour of urine output indicates dehydration and possible poor kidney function.

A nurse is providing an afternoon shift report and relates morning assessment findings to the oncoming nurse. Which daily assessment data is necessary to determine changes in the client's hypervolemia status?

Weight Explanation: Daily weight provides the ability to monitor fluid status. A 2-lb (0.9 kg) weight gain in 24 hours indicates that the client is retaining 1 L of fluid. Also, the loss of weight can indicate a decrease in edema

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?

165 mEq/L Explanation:

What percentage of potassium excreted daily leaves the body by way of the kidneys?

80 Explanation: To maintain the potassium balance, the renal system must function, because 80% of the potassium excreted daily leaves the body by way of the kidneys

A client with excess fluid volume and hyponatremia is in a comatose state. What are the nursing considerations concerning fluid replacement?

Administer small volumes of a hypertonic solution. Explanation: In clients with normal or excess fluid volume, hyponatremia is usually treated effectively by restricting fluid with clients who are not neurologically impaired. When the serum sodium concentration is overcorrected (exceeding 140 mEq/L) too rapidly or in the presence of hypoxia or anoxia, the client can develop neurological symptoms. However, if neurologic symptoms are severe (e.g., seizures, delirium, coma), or if the client has traumatic brain injury, it may be necessary to administer small volumes of a hypertonic sodium solution with the goal of alleviating cerebral edema.

A client is diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH). The nurse informs the client that the physician will order diuretic therapy and restrict fluid and sodium intake to treat the disorder. If the client doesn't comply with the recommended treatment, which complication may arise?

Cerebral edema Explanation: Noncompliance with treatment for SIADH may lead to water intoxication from fluid retention caused by excessive antidiuretic hormone. This, in turn, limits water excretion and increases the risk for cerebral edema. Hypovolemic shock results from, severe deficient fluid volume; in contrast, SIADH causes excess fluid volume. The major electrolyte disturbance in SIADH is dilutional hyponatremia, not hyperkalemia. Because SIADH doesn't alter renal function, potassium excretion remains normal; therefore, severe hyperkalemia doesn't occur.

Which of the following is a clinical manifestation of fluid volume excess (FVE)? Select all that apply.

Distended neck veins Crackles in the lung fields Shortness of breath Explanation: Clinical manifestations of FVE (hypervolemia) include distended neck veins, crackles in the lung fields, shortness of breath, increased blood pressure, and tachycardia.

Which condition might occur with respiratory acidosis?

Increased intracranial pressure Explanation: If respiratory acidosis is severe, intracranial pressure may increase, resulting in papilledema and dilated conjunctival blood vessels.

When caring for a client who has risk factors for fluid and electrolyte imbalances, which assessment finding is the highest priority for the nurse to follow up?

Irregular heart rate Explanation: Irregular heart rate may indicate a potentially life-threatening cardiac dysrhythmia. Potassium, magnesium, and calcium imbalances may cause dysrhythmias.

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?

Lungs and kidney Explanation: 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.

To confirm an acid-base imbalance, it is necessary to assess which findings from a client's arterial blood gas (ABG) results? Select all that apply.

PaCO2 HCO3 pH Explanation: Arterial blood gas (ABG) results are the main tool for measuring blood pH, CO2 content (PaCO2), and bicarbonate (HCO3). The two types of acid-base imbalances are acidosis and alkalosis.

A client with chronic renal failure has a serum potassium level of 6.8 mEq/L. What should the nurse assess first?

Pulse Explanation: 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

A client is diagnosed with syndrome of inappropriate antidiuretic hormone (SIADH). The nurse should anticipate which laboratory test result?

Serum sodium level of 124 mEq/L Explanation: In SIADH, the posterior pituitary gland produces excess antidiuretic hormone (vasopressin), which decreases water excretion by the kidneys. This, in turn, reduces the serum sodium level, causing hyponatremia, as indicated by a serum sodium level of 124 mEq/L. In SIADH, the serum creatinine level isn't affected by the client's fluid status and remains within normal limits. A hematocrit of 52% and a BUN level of 8.6 mg/dl are elevated. Typically, the hematocrit and BUN level decrease.

The nurse is caring for a client diagnosed with bulimia. The client is being treated for a serum potassium concentration of 2.9 mEq/L (2.9 mmol/L). Which statement made by the client indicates the need for further teaching?

"I can use laxatives and enemas but only once a week." Explanation: The client is experiencing hypokalemia, most likely due to the diagnosis of bulimia. Hypokalemia is defined as a serum potassium concentration <3.5 mEq/L (3.5 mmol/L), and usually indicates a deficit in total potassium stores. Clients diagnosed with bulimia frequently suffer increased potassium loss through self-induced vomiting and misuse of laxatives, diuretics, and enemas; thus, the client should avoid laxatives and enemas. Prevention measures may involve encouraging the client at risk to eat foods rich in potassium (when the diet allows), including fruit juices and bananas, melon, citrus fruits, fresh and frozen vegetables, lean meats, milk, and whole grains. If the hypokalemia is caused by abuse of laxatives or diuretics, client education may help alleviate the problem.

The nurse is instructing a client with recurrent hyperkalemia about following a potassium-restricted diet. Which statement by the client indicates the need for additional instruction?

"I will not salt my food; instead I'll use salt substitute." Explanation: The client should avoid salt substitutes. The nurse must caution clients to use salt substitutes sparingly if they are taking other supplementary forms of potassium or potassium-conserving diuretics. Potassium-rich foods to be avoided include many fruits and vegetables, legumes, whole-grain breads, lean meat, milk, eggs, coffee, tea, and cocoa. Conversely, foods with minimal potassium content include butter, margarine, cranberry juice or sauce, ginger ale, gumdrops or jellybeans, hard candy, root beer, sugar, and honey. Labels of cola beverages must be checked carefully because some are high in potassium and some are not.

A client has chronic hyponatremia, which requires weekly laboratory monitoring to prevent the client lapsing into convulsions or a coma. What is the level of serum sodium at which a client can experience these side effects?

114 mEq/L Explanation: Hyponatremia occurs when the serum sodium level dips below 135 mEq/L. When serum sodium levels fall below 115mEq/L, mental confusion, muscular weakness, anorexia, restlessness, elevated body temperature, tachycardia, nausea, vomiting, personality changes, convulsions, or coma can occur. A serum sodium level of 148 mEq/L would indicate hypernatremia. Normal serum concentration levels range from 135 to 145 mEq/L.

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?

158.0 lbs (71.7 kg) Explanation: 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).

Which is the most common cause of symptomatic hypomagnesemia?

Alcoholism Explanation: Alcoholism is currently the most common cause of symptomatic 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?

Bicarbonate Explanation: 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.

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?

Calcium Explanation: 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.

The nurse is caring for a client being treated with isotonic IV fluid for hypernatremia. What complication of hypernatremia should the nurse continuously monitor for?

Cerebral edema Explanation: Treatment of hypernatremia consists of a gradual lowering of the serum sodium level by the infusion of a hypotonic electrolyte solution (e.g., 0.3% sodium chloride) or an isotonic nonsaline solution (e.g., dextrose 5% in water [D5W]).

Air embolism is a potential complication of IV therapy. The nurse should be alert to which clinical manifestation associated with air embolism?

Chest pain Explanation: Manifestations of air embolism include dyspnea and cyanosis; hypotension; weak, rapid pulse; loss of consciousness; and chest, shoulder, and low back pain.

Which electrolyte is a major anion in body fluid?

Chloride Explanation: Chloride is a major anion found in extracellular fluid.

Which findings indicate that a client has developed water intoxication secondary to treatment for diabetes insipidus?

Confusion and seizures Explanation: Classic signs of water intoxication include confusion and seizures, both of which are caused by cerebral edema. Weight gain will also occur. Sunken eyeballs, thirst, and increased BUN levels indicate fluid volume deficit. Spasticity, flaccidity, and tetany are unrelated to water intoxication.

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?

Extracellular fluid volume deficit Explanation: 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 assessing a client for local complications of intravenous therapy. Which are local complications? Select all that apply.

Extravasation Infection Hematoma Phlebitis Explanation: Local complications of intravenous therapy include infiltration and extravasation, phlebitis, thrombophlebitis, hematoma, and clotting of the needle. Infections can be local or systemic

Before seeing a newly assigned client with respiratory alkalosis, a nurse quickly reviews the client's medical history. Which condition is a predisposing factor for respiratory alkalosis?

Extreme anxiety Explanation: Extreme anxiety may lead to respiratory alkalosis by causing hyperventilation, which results in excessive carbon dioxide (CO2) loss. Other conditions that may set the stage for respiratory alkalosis include fever, heart failure, injury to the brain's respiratory center, overventilation with a mechanical ventilator, pulmonary embolism, and early salicylate intoxication.

Which nerve is implicated in the Chvostek's sign?

Facial Explanation: Chvostek's sign consists of twitching of muscles supplied by the facial nerve when the nerve is tapped about 2 cm anterior to the earlobe, just below the zygomatic arch.

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?

Hypocalcemia Explanation: 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.

A patient has a serum osmolality of 250 mOsm/kg. The nurse knows to assess further for:

Hyponatremia. Explanation: Decreased serum sodium is a factor associated with decreased serum osmolality.

Which sign suggests that a client with the syndrome of inappropriate antidiuretic hormone (SIADH) secretion is experiencing complications?

Jugular vein distention Explanation: SIADH secretion causes antidiuretic hormone overproduction, which leads to fluid retention. Severe SIADH can cause such complications as vascular fluid overload, signaled by jugular vein distention

The nurse is caring for a client with severe diarrhea. The nurse recognizes that the client is at risk for developing which acid-base imbalance?

Metabolic acidosis Explanation: The client is at risk for developing metabolic acidosis. Metabolic acidosis is caused by diarrhea, lower intestinal fistulas, ureterostomies, and use of diuretics; early renal insufficiency; excessive administration of chloride; and the administration of parenteral nutrition without bicarbonate or bicarbonate-producing solutes (e.g., lactate).

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?

Metabolic alkalosis Explanation: 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.

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?

Metabolic alkalosis Explanation: 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 client with a suspected overdose of an unknown drug is admitted to the emergency department. Arterial blood gas values indicate respiratory acidosis. What should the nurse do first?

Prepare to assist with ventilation. Explanation: Respiratory acidosis is associated with hypoventilation; in this client, hypoventilation suggests intake of a drug that has suppressed the brain's respiratory center. Therefore, the nurse should assume the client has respiratory depression and should prepare to assist with ventilation. After the client's respiratory function has been stabilized, the nurse can safely monitor the heart rhythm, prepare for gastric lavage, and obtain a urine specimen for drug screening.

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?

Respiratory acidosis Explanation: 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.

A 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?

Restricting fluids to 800 ml/day Explanation: 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

A patient with diabetes insipidus presents to the emergency room for treatment of dehydration. The nurse knows to review serum laboratory results for which of the diagnostic indicators?

Sodium level of 150 mEq/L Explanation: Hypernatremia (normal serum sodium is 135 to 145 mEq/L) is consistent with increased fluid loss and dehydration in diabetes insipidus.

The nurse is caring for a client diagnosed with chronic obstructive pulmonary disease (COPD) and experiencing respiratory acidosis. The client asks what is making the acidotic state. The nurse is most correct to identify which result of the disease process that causes the fall in pH?

The lungs are not able to blow off carbon dioxide. Explanation: In clients with chronic respiratory acidosis, the client is unable to blow off carbon dioxide leaving in increased amount of hydrogen in the system. The increase in hydrogen ions leads to acidosis. In COPD, the client is able to breathe in oxygen and gas exchange can occur, it is the lungs ability to remove the carbon dioxide from the system. Although individuals with COPD frequently have a history of smoking, cilia is not the cause of the acidosis.

A client has a serum calcium level of 7.2 mg/dl (1.8 mmol/L). During the physical examination, the nurse expects to assess:

Trousseau's sign. Explanation: This client's serum calcium level indicates hypocalcemia, an electrolyte imbalance that causes Trousseau's sign (carpopedal spasm induced by inflating the blood pressure cuff above systolic pressure).

A client with hypervolemia asks the nurse by what mechanism the sodium-potassium pump will move the excess body fluid. What is the nurse's best answer?

active transport Explanation: Active transport is the physiologic pump maintained by the cell membrane that results in the movement of fluid from an area of lower concentration to one of higher concentration. Active transport requires adenosine triphosphate (ATP) for energy. The sodium-potassium pump actively moves sodium against the concentration gradient out of the cell, and fluid follows.

A nurse is providing client teaching about the body's plasma pH and the client asks the nurse what is the major chemical regulator of plasma pH. What is the best response by the nurse?

bicarbonate-carbonic acid buffer system Explanation: The major chemical regulator of plasma pH is the bicarbonate-carbonic acid buffer system.

A client with emphysema is at a greater risk for developing which acid-base imbalance?

chronic respiratory acidosis Explanation: 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 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?

hypokalemia Explanation: 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

Early signs of hypervolemia include

increased breathing effort and weight gain. Explanation: 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.

A client with a history of anxiety experiences respiratory alkalosis. The nurse measures a respiratory rate of 46 breaths/minute, a heart rate of 110 beats/minute, a blood pressure of 162/90 mm Hg, and a temperature of 98.6° F (37° C). To help correct respiratory alkalosis, the nurse should:

instruct the client to breathe into a paper bag. Explanation: A client with a history of anxiety who experiences respiratory alkalosis should breathe into a paper bag to increase arterial carbon dioxide tension and ease anxiety (which may exacerbate the alkalosis)

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

malignancy is causing the electrolyte imbalance. Explanation: 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.

Following a unilateral adrenalectomy, a nurse should assess for hyperkalemia as indicated by:

muscle weakness. Explanation: 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.

Oncotic pressure refers to the

osmotic pressure exerted by proteins. Explanation: Oncotic pressure is a pulling pressure exerted by proteins such as albumin. Osmolality refers to the number of dissolved particles contained in a unit of fluid.

When evaluating arterial blood gases (ABGs), which value is consistent with metabolic alkalosis?

pH 7.48 Explanation: 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.

The nurse is analyzing the arterial blood gas (ABG) results of a client diagnosed with severe pneumonia. Which of the following ABG results indicates respiratory acidosis?

pH: 7.20, PaCO2: 65 mm Hg, HCO3-: 26 mEq/L Explanation: Respiratory acidosis is a clinical disorder in which the pH is less than 7.35-7.40 and the PaCO2 is greater than 40-45 mm Hg and a compensatory increase in the plasma HCO3- occurs. Respiratory acidosis may be either acute or chronic.