ATI Pharmacology Test Bank

Correct Answer: C

Rationale: Phenytoin is primarily used to diminish seizure activity and is effective in terminating ventricular arrhythmias. It works by stabilizing neuronal membranes, reducing repetitive neuronal firing, and limiting the spread of seizure activity in the brain. While phenytoin does not have a direct role in preventing thrombus formation or extending existing thrombi, it is crucial in managing seizures and certain arrhythmias.

Correct Answer: B

Rationale: An older adult client with prostatitis who is receiving antibiotics should be monitored for toxicity due to age-related reductions in medication metabolism and excretion. Older adults are more susceptible to antibiotic toxicity, making them a high-risk group for adverse effects.

Correct Answer: A

Rationale: It is crucial to monitor ins and outs in patients using ACE inhibitors to assess for renal impairment. ACE inhibitors can affect renal function, potentially leading to renal impairment. Monitoring the patient's fluid balance helps in early recognition of any renal issues and allows for timely interventions to prevent complications.

Correct Answer: D

Rationale: After a pneumonectomy, positioning the client in a semi-Fowler's position is crucial for optimal ventilation. This position helps improve lung expansion on the remaining side, facilitating better oxygenation and preventing complications like atelectasis. Placing the client prone, on the nonoperative side, or in Sims' position would not provide the same respiratory benefits post-pneumonectomy.

Correct Answer: A

Rationale: An aPTT of 90 seconds is above the therapeutic range for heparin, which typically falls between 60-80 seconds. This indicates that the current heparin dose is too high, and the infusion rate should be decreased to avoid excessive anticoagulation and the risk of bleeding. Monitoring aPTT is crucial in adjusting heparin therapy to maintain it within the therapeutic range.