A 13-year-old male has begun having spells of wheezing and difficulty breathing while playing outside. He is diagnosed with asthma and given an inhaler to treat acute attacks. His medication is working well, but he would also like something to prevent attacks from happening. Which of the following drugs would be best to add to his regimen?

Correct Answer: D

Rationale: Asthma prevention in a child needs a long-acting agent. Salmeterol , a long-acting β2-agonist, reduces attack frequency. Albuterol and Epinephrine are short-acting. Ipratropium aids acute relief. Isoproterenol (E) is outdated. Salmeterol's prolonged bronchodilation suits prophylaxis.

Correct Answer: C

Rationale: Furosemide, a loop diuretic, promotes the excretion of potassium, sodium, and water. Hypokalemia (low potassium) is a common side effect and can lead to muscle weakness, arrhythmias, and other complications. Hyperkalemia (A) is unlikely with furosemide. Hypernatremia (B) and hyponatremia (D) are less common but should still be monitored.

Correct Answer: D

Rationale: Packed red blood cells (PRBCs) are the most appropriate blood product for a severely anemic patient who needs an increase in hemoglobin and hematocrit levels. PRBC transfusions provide a concentrated dose of red blood cells to improve oxygen-carrying capacity in the blood. This can help address the anemia and improve symptoms related to decreased oxygen delivery to tissues, such as fatigue and weakness. Fresh frozen plasma, albumin, and whole blood do not specifically target the anemia in this scenario and are not the primary choice for raising hemoglobin and hematocrit levels in a patient with severe anemia and acute heart failure.

Correct Answer: A

Rationale: Phenytoin is an antiepileptic drug that can commonly cause drowsiness, ataxia (loss of full control of bodily movements), and dry mouth as side effects. These side effects are important to monitor in patients taking Phenytoin to ensure their safety and well-being. Increased suicidal thoughts are not a common side effect associated with Phenytoin.

Correct Answer: D

Rationale: A phenytoin level of 25 mcg/ml is above the therapeutic range (10-20 mcg/ml) and can cause toxicity symptoms such as nystagmus, ataxia, and confusion. Hyperactivity and tremors are not typical signs of phenytoin toxicity. Therefore, nystagmus is the expected symptom.