The nurse is caring for a client who was recently diagnosed with hepatic encephalopathy. What assessment would assist the nurse in identifying elevated serum ammonia levels?

Neurologic assessment

Abdominal assessment

Cardiovascular assessment

Respiratory assessment

Answer and Explanation

The Correct Answer is A

Hepatic encephalopathy is a reversible neuropsychiatric syndrome resulting from advanced liver failure or portosystemic shunting. The accumulation of neurotoxic ammonia crosses the blood-brain barrier, leading to astrocyte swelling and cerebral edema. Clinical hallmarks include altered consciousness, personality changes, and motor disturbances like asterixis, necessitating frequent monitoring of brain function.

Rationale:

A. A neurologic assessment is the primary method for identifying elevated ammonia levels in hepatic encephalopathy. Ammonia acts as a potent neurotoxin that disrupts normal neurotransmission and causes cognitive decline, ranging from mild confusion to hepatic coma. The nurse must monitor for lethargy, irritability, and the presence of asterixis, which are direct clinical reflections of hyperammonemia-induced brain dysfunction.

B. Abdominal assessment, while important for identifying ascites or hepatomegaly in liver patients, does not directly reflect serum ammonia levels. Physical changes in the abdomen relate to portal hypertension and fluid shifts rather than the neurochemical status of the patient. Consequently, abdominal findings cannot provide real-time data regarding the severity of encephalopathy or the neurotoxic burden on the central nervous system.

C. Cardiovascular assessment monitors hemodynamics and heart rhythm, which may be altered in end-stage liver disease but are not specific to ammonia toxicity. While portal hypertension can affect systemic circulation, heart rate and blood pressure do not serve as reliable indicators for the metabolic brain injury caused by hyperammonemia. Therefore, this assessment is secondary to the prioritized evaluation of the patient's neurological and cognitive status.

D. Respiratory assessment tracks oxygenation and ventilation, which are not the primary targets of ammonia-induced toxicity. Although advanced liver disease can lead to hepatopulmonary syndrome, the specific cognitive and motor changes associated with hepatic encephalopathy are not detected through lung auscultation. The neurologic system remains the most sensitive indicator of rising or falling ammonia levels in these patients.

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Correct Answer is C

Explanation

Acute glomerulonephritisis an inflammatory condition of the glomerular capillaries, often following a streptococcal infection. The inflammation reduces the glomerular filtration rate(GFR), leading to the retention of sodium and water, which causes systemic edema and hypertension. A positive response to treatment is indicated by the resolution of this fluid volume excess as the glomerular basement membranebegins to heal and resume normal filtration.

Rationale:

A.A urine specific gravity of 1.048 is abnormally high (normal is 1.005 to 1.030) and indicates extremely concentrated urine. This usually signifies dehydration or the presence of excess solutes like protein and glucose. In the context of GN, it does not indicate healing; rather, it suggests that the kidney is still struggling to produce an appropriate volume of filtrate.

B.A blood pressure of 152/88 mm Hg is hypertensive and indicates that the disease process is still causing significant fluid retention and vascular resistance. Hypertension is a key symptom of GN due to the activation of the renin-angiotensin systemand fluid overload. A positive response to treatment would be a return of blood pressure toward the normal range of <120/80 mm Hg.

C.Losing 11 lb (5 kg)over 10 days is a positive response because it indicates the mobilization and excretion of excess fluid. In GN, weight gain is caused by edema and fluid retention. As the glomerular inflammation subsides and diuresis occurs, the patient will lose this excess water weight. This is the most objective evidence that the kidneys are regaining their filtration capacity.

D.While the absence of gross hematuria is good, microscopic hematuria can persist for many months after an episode of acute GN and does not necessarily mean the acute phase is over. Weight loss and blood pressure stabilization are more immediate and reliable indicators of the resolution of fluid volume excess, which is the most dangerous acute complication of the condition.

A. Increased blood urea nitrogen (BUN) B. Decreased sodium level C. Increased creatinine level D. Pale-colored urine

Correct Answer is A

Explanation

Blood urea nitrogen(BUN) is a metabolic byproduct of protein catabolism that is normally filtered by the glomeruli. While it is a marker of renal function, it is also highly sensitive to volume status. In cases of dehydration or pre-renal azotemia, the slower flow of filtrate through the tubules allows for increased reabsorption of urea into the blood, leading to an elevated BUN disproportionate to creatinine levels.

Rationale:

A.An increased blood urea nitrogen(BUN) often indicates a state of dehydration or pre-renal azotemia, suggesting the need for increased fluid intake. When intravascular volume is low, renal perfusion decreases, causing the BUN to rise. If the BUN-to-creatinine ratio exceeds 20:1, it strongly suggests that the patient's renal function is being hampered by insufficient fluid volume.

B.A decreased sodium level, or hyponatremia, in a kidney failure patient usually indicates fluid volume excess rather than a need for more fluids. This is typically a "dilutional" hyponatremia where the patient has retained too much water relative to sodium. Adding more fluids in this scenario would worsen the electrolyte imbalance and increase the risk of cerebral edema.

C.Increased creatinine levels signify intrinsic damage to the nephrons and a reduction in the glomerular filtration rate. Unlike BUN, creatinine is not significantly affected by hydration status alone and is a more permanent marker of kidney damage. Raising fluid intake may not necessarily lower creatinine if the underlying renal tissue is chronically scarred or acutely necrotic.

D.Pale-colored urine indicates that the urine is dilute and the kidneys are successfully excreting water. This is a sign of adequate hydration rather than a need for increased fluid intake. In kidney failure, the inability to concentrate urine can also result in pale urine, but it never serves as an indicator for more fluid administration.

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The nurse is caring for a client who was recently diagnosed with hepatic encephalopathy. What assessment would assist the nurse in identifying elevated serum ammonia levels?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse evaluates a client with acute glomerulonephritis (GN). Which assessment finding would the nurse recognize as a positive response to the prescribed treatment?

Correct Answer is C

Explanation

The nurse is caring for a client with kidney failure. Which assessment data indicates the need for increased fluids?

Correct Answer is A

Explanation

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