A 6-week-old infant with poor weight gain is scheduled for a pyloromyotomy. Which pre-operative nursing action has the highest priority?

Choice C is correct because serum potassium, calcium, and phosphorus are electrolytes that can be affected by ESRD. ESRD is a condition in which the kidneys lose their ability to filter waste products and excess fluids from the blood. This can cause electrolyte imbalances that can lead to serious complications, such as cardiac arrhythmias, bone disorders, or metabolic acidosis. The nurse should closely monitor these electrolytes and report any abnormal values.

Choice A is incorrect because blood pressure, heart rate, and temperature are vital signs that are not specific to ESRD. Vital signs can be influenced by many factors and may not reflect the severity of kidney damage. The nurse should monitor vital signs regularly, but not as closely as electrolytes.

Choice B is incorrect because leukocytes, neutrophils, and thyroxine are not laboratory results that are directly related to ESRD. Leukocytes and neutrophils are types of white blood cells that are involved in immune response and inflammation. Thyroxine is a hormone that regulates metabolism and growth. These laboratory results may be altered by other conditions or medications, but not by ESRD.

Choice D is incorrect because erythrocytes, hemoglobin, and hematocrit are laboratory results that measure the red blood cell count and oxygen-carrying capacity of the blood. These laboratory results may be decreased in ESRD due to anemia, which is a common complication of chronic kidney disease. However, anemia is not as life-threatening as electrolyte imbalances and can be treated with erythropoietin injections or iron supplements.

Choice A: Monitoring indwelling urinary catheter and measure strict intake and output is not an action that the nurse should immediately take, as this is not relevant or urgent for a client who may have had a stroke. This is a distractor choice.

Choice B: Keeping the bed in the lowest position and initiating seizure and fall precautions is not an action that the nurse should immediately take, as this is a preventive measure that does not address the acute problem of impaired cerebral perfusion. This is another distractor choice.

Choice C: Starting two large bore IV catheters and reviewing inclusion criteria for IV fibrinolytic therapy is an action that the nurse should immediately take, as this can prepare the client for potential administration of tissue plasminogen activator (tPA., which can dissolve blood clots and restore blood flow to the brain if given within 4.5 hours of stroke onset. Therefore, this is the correct choice.

Choice D: Maintaining elevated positioning of the dependent joints on affected side is not an action that the nurse should immediately take, as this can worsen edema and impair circulation in the affected limbs. The recommended position is to keep them at or below heart level. This is another distractor choice.