Renal Failure
Which of the following is characteristic of the intrarenal category of acute renal failure? a. increased BUN b. high specific gravity c. decreased urine sodium d. decreased creatinine
a. increased BUN The intrarenal category of acute renal failure encompasses an increased BUN, increased creatinine, a low specific gravity of urine, and an increased urine sodium.
A client who has been treated for chronic renal failure (CRF) is ready for discharge. The nurse should reinforce which dietary instruction? 1. "Be sure to eat meat at every meal." 2. "Eat plenty of bananas." 3. "Increase your carbohydrate intake." 4. "Drink plenty of fluids, and use a salt substitute."
3. "Increase your carbohydrate intake." Extra carbohydrates are needed to prevent protein catabolism. In a client with CRF, unrestricted intake of sodium, protein, potassium, and fluid may lead to a dangerous accumulation of electrolytes and protein metabolic products, such as amino acids and ammonia. Therefore, the client must limit intake of sodium; meat, which is high in protein; bananas, which are high in potassium; and fluid, because the failing kidneys can't secrete adequate urine. Salt substitutes are high in potassium and should be avoided.
A client with acute renal failure is undergoing dialysis for the first time. The nurse monitors the client closely for dialysis equilibrium syndrome, a complication that is most common during the first few dialysis sessions. Typically, dialysis equilibrium syndrome causes: 1. confusion, headache, and seizures. 2. acute bone pain and confusion. 3. weakness, tingling, and cardiac arrhythmias. 4. hypotension, tachycardia, and tachypnea.
1. confusion, headache, and seizures. Dialysis equilibrium syndrome causes confusion, a decreasing level of consciousness, headache, and seizures. These findings, which may last several days, probably result from a relative excess of interstitial or intracellular solutes caused by rapid solute removal from the blood. The resultant organ swelling interferes with normal physiological functions. To prevent this syndrome, many dialysis centers keep first-time sessions short and use a reduced blood flow rate. Acute bone pain and confusion are associated with aluminum intoxication, another potential complication of dialysis. Weakness, tingling, and cardiac arrhythmias suggest hyperkalemia, which is associated with renal failure. Hypotension, tachycardia, and tachypnea signal hemorrhage, another dialysis complication.
A client is admitted for treatment of chronic renal failure (CRF). The nurse knows that this disorder increases the client's risk of: 1. water and sodium retention secondary to a severe decrease in the glomerular filtration rate. 2. a decreased serum phosphate level secondary to kidney failure. 3. an increased serum calcium level secondary to kidney failure. 4. metabolic alkalosis secondary to retention of hydrogen ions.
1. water and sodium retention secondary to a severe decrease in the glomerular filtration rate. A client with CRF is at risk for fluid imbalance — dehydration if the kidneys fail to concentrate urine, or fluid retention if the kidneys fail to produce urine. Electrolyte imbalances associated with this disorder result from the kidneys' inability to excrete phosphorus; such imbalances may lead to hyperphosphatemia with reciprocal hypocalcemia. CRF may cause metabolic acidosis, not metabolic alkalosis, secondary to inability of the kidneys to excrete hydrogen ions.
Which clinical finding would the nurse look for in a client with chronic renal failure? 1. Hypotension 2. Uremia 3. Metabolic alkalosis 4. Polycythemia
2. Uremia Uremia is the buildup of nitrogenous wastes in the blood, evidenced by an elevated blood urea nitrogen and creatine levels. Uremia, anemia, and acidosis are consistent clinical manifestations of chronic renal failure. Metabolic acidosis results from the inability to excrete hydrogen ions. Anemia results from a lack of erythropoietin. Hypertension (from fluid overload) may or may not be present in chronic renal failure. Hypotension, metabolic alkalosis, and polycythemia aren't present in renal failure.
A client is admitted with a diagnosis of acute renal failure. The nurse should monitor closely for: 1. enuresis. 2. drug toxicity. 3. lethargy. 4. insomnia.
2. drug toxicity. Acute renal failure is characterized by oliguria and rapid accumulation of nitrogen waste in the blood. Kidneys excrete medications, so the nurse should monitor the client closely for drug toxicity. With decreased urinary output or no output, enuresis shouldn't occur. The client will most likely feel lethargic, but this isn't as serious a problem as drug toxicity. The client isn't likely to have insomnia, but, may instead want to sleep most of the time.
A client with chronic renal failure who receives hemodialysis three times weekly has a hemoglobin (Hb) level of 7 g/dl. The most therapeutic pharmacologic intervention would be to administer: 1. ferrous sulfate (Feratab). 2. epoetin alfa (Epogen) 3. filgrastim (Neupogen) 4. enoxaparin (Lovenox)
2. epoetin alfa (Epogen) Chronic renal failure diminishes the production of erythropoietin by the kidneys and leads to a subnormal Hb level. (Normal Hb level is 13 to 18 g/dl in men and 12 to 16 g/dl in women.) An effective pharmacologic treatment for this is epoetin alfa, a recombinant erythropoietin. Because the client's anemia is caused by a deficiency of erythropoietin and not a deficiency of iron, administering ferrous sulfate would be ineffective. Neither filgrastim, a drug used to stimulate neutrophils, nor enoxaparin (low-molecular-weight heparin) will raise the client's Hb level.
A client with chronic renal failure (CRF) is receiving a hemodialysis treatment. After hemodialysis, the nurse knows that the client is most likely to experience: 1. hematuria. 2. weight loss. 3. increased urine output. 4. increased blood pressure.
2. weight loss. Because CRF causes loss of renal function, the client with this disorder retains fluid. Hemodialysis removes this fluid, causing weight loss. Hematuria is unlikely to follow hemodialysis because the client with CRF usually forms little or no urine. Hemodialysis doesn't increase urine output because it doesn't correct the loss of kidney function, which severely decreases urine production in this disorder. By removing fluids, hemodialysis decreases rather than increases the blood pressure.
A client with chronic renal failure (CRF) is admitted to the urology unit. Which diagnostic test results are consistent with CRF? 1. Increased pH with decreased hydrogen ions 2. Increased serum levels of potassium, magnesium, and calcium 3. Blood urea nitrogen (BUN) 100 mg/dl and serum creatinine 6.5 mg/dl 4. Uric acid analysis 3.5 mg/dl and phenolsulfonphthalein (PSP) excretion 75%
3. Blood urea nitrogen (BUN) 100 mg/dl and serum creatinine 6.5 mg/dl The normal BUN level ranges 8 to 23 mg/dl; the normal serum creatinine level ranges from 0.7 to 1.5 mg/dl. The test results in option 3 are abnormally elevated, reflecting CRF and the kidneys' decreased ability to remove nonprotein nitrogen waste from the blood. CRF causes decreased pH and increased hydrogen ions — not vice versa. CRF also increases serum levels of potassium, magnesium, and phosphorous, and decreases serum levels of calcium. A uric acid analysis of 3.5 mg/dl falls within the normal range of 2.7 to 7.7 mg/dl; PSP excretion of 75% also falls within the normal range of 60% to 75%.
For a client in the oliguric phase of acute renal failure (ARF), which nursing intervention is most important? 1. Encouraging coughing and deep breathing 2. Promoting carbohydrate intake 3. Limiting fluid intake 4. Providing pain-relief measures
3. Limiting fluid intake During the oliguric phase of ARF, urine output decreases markedly, possibly leading to fluid overload. Limiting oral and I.V. fluid intake can prevent fluid overload and its complications, such as heart failure and pulmonary edema. Encouraging coughing and deep breathing is important for clients with various respiratory disorders. Promoting carbohydrate intake may be helpful in ARF but doesn't take precedence over fluid limitation. Controlling pain isn't important because ARF rarely causes pain.
A client with renal failure is undergoing continuous ambulatory peritoneal dialysis. Which nursing diagnosis is most appropriate for this client? 1. Impaired urinary elimination 2. Toileting self-care deficit 3. Risk for infection 4. Activity intolerance
3. Risk for infection The peritoneal dialysis catheter and regular exchanges of the dialysis bag provide a direct portal for bacteria to enter the body. Therefore, the client is at risk for infection. If the client experiences repeated peritoneal infections, continuous ambulatory peritoneal dialysis may no longer be effective in clearing waste products. The other options may be pertinent but are secondary to the risk for infection.
The nurse is caring for a client diagnosed with acute renal failure. The nurse notes on the intake and output record that the total urine output for the previous 24 hours was 95 ml. Urine output that's less than 100 ml in 24 hours is known as: 1. oliguria. 2. polyuria. 3. anuria. 4. hematuria.
3. anuria. Urine output less than 100 ml in 24 hours is called anuria. Urine output of less than 400 ml but more than 100 ml in 24 hours is called oliguria. Polyuria is excessive urination. Hematuria is the presence of blood in the urine.
A client with chronic renal failure (CRF) has developed faulty red blood cell (RBC) production. The nurse should monitor this client for: 1. nausea and vomiting. 2. dyspnea and cyanosis. 3. fatigue and weakness. 4. thrush and circumoral pallor.
3. fatigue and weakness. RBCs carry oxygen throughout the body. Decreased RBC production diminishes cellular oxygen, leading to fatigue and weakness. Nausea and vomiting may occur in CRF but don't result from faulty RBC production. Dyspnea and cyanosis are associated with fluid excess, not CRF. Thrush, which signals fungal infection, and circumoral pallor, which reflects decreased oxygenation, aren't signs of CRF.
A client requires hemodialysis. Which type of drug should be withheld before this procedure? 1. Phosphate binders 2. Insulin 3. Antibiotics 4. Cardiac glycosides
4. Cardiac glycosides Cardiac glycosides such as digoxin should be withheld before hemodialysis. Hypokalemia is one of the electrolyte shifts that occur during dialysis, and a hypokalemic client is at risk for arrhythmias secondary to digitalis toxicity. Phosphate binders and insulin can be administered because they aren't removed from the blood by dialysis. Some antibiotics are removed by dialysis and should be administered after the procedure to ensure their therapeutic effects. The nurse should check a formulary to determine whether a particular antibiotic should be administered before or after dialysis.
A client with chronic renal failure has a serum potassium level of 6.8 mEq/L. What should the nurse assess first? 1. Blood pressure 2. Respirations 3. Temperature 4. Pulse
4. Pulse An elevated serum potassium level may lead to a life-threatening cardiac arrhythmia, which the nurse can detect immediately by palpating the pulse. 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 can delay assessing respirations and temperature because these aren't affected by the serum potassium level.
A client admitted with a gunshot wound to the abdomen is transferred to the intensive care unit after an exploratory laparotomy. I.V. fluid is being infused at 150 ml/hr. Which assessment finding suggests that the client is experiencing acute renal failure (ARF)? 1. Blood urea nitrogen (BUN) level of 22 mg/dl 2. Serum creatinine level of 1.2 mg/dl 3. Temperature of 100.2° F (37.8° C) 4. Urine output of 250 ml/24 hours
4. Urine output of 250 ml/24 hours ARF, characterized by abrupt loss of kidney function, commonly causes oliguria, which is demonstrated by a urine output of 250 ml/24 hours. A serum creatinine level of 1.2 mg/dl isn't diagnostic of ARF. A BUN level of 22 mg/dl or a temperature of 100.2° F (37.8° C) wouldn't result from this disorder.
A client with decreased urine output refractory to fluid challenges is evaluated for renal failure. Which condition may cause the intrinsic (intrarenal) form of acute renal failure? 1. Poor perfusion to the kidneys 2. Damage to cells in the adrenal cortex 3. Obstruction of the urinary collecting system 4. Nephrotoxic injury secondary to use of contrast media
4. Nephrotoxic injury secondary to use of contrast media Intrinsic renal failure results from damage to the kidney, such as from nephrotoxic injury caused by contrast media, antibiotics, corticosteroids, or bacterial toxins. Poor perfusion to the kidneys may result in prerenal failure. Damage to the epithelial cells of the renal tubules results from nephrotoxic injury, not damage to the adrenal cortex. Obstruction of the urinary collecting system may cause postrenal failure.
The nurse is caring for a client with chronic renal failure. The laboratory results indicate hypocalcemia and hyperphosphatemia. When assessing the client, the nurse should be alert for which of the following? 1. Trousseau's sign 2. Cardiac arrhythmias 3. Constipation 4. Decreased clotting time 5. Drowsiness and lethargy 6. Fractures
1. Trousseau's sign 2. Cardiac arrhythmias 6. Fractures Hypocalcemia is a calcium deficit that causes nerve fiber irritability and repetitive muscle spasms. Signs and symptoms of hypocalcemia include Trousseau's sign, cardiac arrhythmias, diarrhea, increased clotting times, anxiety, and irritability. The calcium-phosphorus imbalance leads to brittle bones and pathologic fractures.
When caring for a client with acute renal failure (ARF), the nurse expects to adjust the dosage or dosing schedule of certain drugs. Which of the following drugs would not require such adjustment? 1. acetaminophen (Tylenol) 2. gentamicin sulfate (Garamycin) 3. cyclosporine (Sandimmune) 4. ticarcillin disodium (Ticar)
1. acetaminophen (Tylenol) Because acetaminophen is metabolized in the liver, its dosage and dosing schedule need not be adjusted for a client with ARF. In contrast, the dosages and schedules for gentamicin and ticarcillin, which are metabolized and excreted by the kidney, should be adjusted. Because cyclosporine may cause nephrotoxicity, the nurse must monitor both the dosage and blood drug level in a client receiving this drug.
The 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: 1. hypernatremia. 2. hypokalemia. 3. hyperkalemia. 4. hypercalcemia.
3. hyperkalemia. Hyperkalemia is a common complication of acute renal failure. It's life-threatening if immediate action isn't taken to reverse it. The administration of 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 with liver and renal failure has severe ascites. On initial shift rounds, his primary nurse finds his indwelling urinary catheter collection bag too full to store more urine. The nurse empties more than 2,000 ml from the collection bag. One hour later, she finds the collection bag full again. The nurse notifies the physician, who suspects that a bladder rupture is allowing the drainage of peritoneal fluid. The physician orders a urinalysis to be obtained immediately. If the physician's suspicion is correct, the urine will abnormally contain: 1. creatinine. 2. urobilinogen. 3. chloride. 4. albumin.
4. albumin. Albumin is an abnormal finding in a routine urine specimen. Ascites present in liver failure contain albumin; therefore, if the bladder ruptured, ascites containing albumin would drain from the indwelling urinary catheter because the catheter is no longer contained in the bladder. Creatinine, urobilinogen, and chloride are normally found in urine.
A client develops acute renal failure (ARF) after receiving I.V. therapy with a nephrotoxic antibiotic. Because the client's 24-hour urine output totals 240 ml, the nurse suspects that the client is at risk for: 1. cardiac arrhythmia. 2. paresthesia. 3. dehydration. 4. pruritus.
1. cardiac arrhythmia. As urine output decreases, the serum potassium level rises; if it rises sufficiently, hyperkalemia may occur, possibly triggering a cardiac arrhythmia. Hyperkalemia doesn't cause paresthesia (sensations of numbness and tingling). Dehydration doesn't occur during this oliguric phase of ARF, although typically it does arise during the diuretic phase. In a client with ARF, pruritus results from increased phosphates and isn't associated with hyperkalemia.