Correct Answer: A

Rationale: The correct answer is A: Reye's syndrome. Aspirin use in children with viral infections has been associated with Reye's syndrome, a serious condition that causes swelling in the liver and brain. Visual disturbances (choice B) are not typically associated with aspirin use in children with viral infections. Diabetes mellitus (choice C) and Wilms' tumor (choice D) are not adverse effects of aspirin use in this context.

Correct Answer: A

Rationale: To find the dose per administration, first convert the toddler's weight to kg: 28.6 lb · 2.2 = 13 kg. Then calculate the total daily dose: 20 mg/kg 13 kg = 260 mg/day. Since it is divided into two doses, each dose is 130 mg. The concentration of the oral suspension is 250 mg/5 mL = 50 mg/mL. Therefore, to find the volume needed per dose, divide the dose by the concentration: 130 mg · 50 mg/mL = 2.6 mL per dose. Hence, the nurse should administer 2.6 mL per dose. Choices B, C, and D are incorrect as they do not accurately calculate the dosage of chlorothiazide needed per dose based on the toddler's weight and the concentration of the oral suspension.

Correct Answer: B

Rationale: Filgrastim is a medication used to stimulate the production of neutrophils in patients with neutropenia. Neutrophils are a type of white blood cell that plays a crucial role in fighting off infections. Therefore, an increase in neutrophil count would indicate a therapeutic effect of filgrastim. The other options, such as erythrocyte count (red blood cells), lymphocyte count, and thrombocyte count (platelets), are not directly affected by filgrastim and would not indicate a therapeutic effect of this medication.

Correct Answer: D

Rationale: The correct answer is D: Dizziness. Zolpidem is known to cause dizziness, especially in older adults. This adverse effect can increase the risk of falls and injuries in the elderly population. Monitoring for dizziness is crucial to ensure patient safety. Choice A, Ecchymosis, is the development of bruising and is not a common adverse effect of zolpidem. Choices B and C, Decreased urine output and Increased blood pressure, are not typically associated with zolpidem use. Therefore, they are incorrect choices in this scenario.

Correct Answer: D

Rationale: Clients taking digoxin and furosemide are at risk for hypokalemia. Eating potassium-rich foods can help maintain normal potassium levels.