Final answer:
The nurse should administer a PRN dose of albuterol to a client admitted with a severe asthma attack.
Step-by-step explanation:
In this scenario, the client is admitted with a severe asthma attack, experiencing increasing shortness of breath for the last three hours. The arterial blood gas results indicate a pH of 7.22, pCO2 of 55 mmHg, and HCO3 of 25 meq/L (25 mmol/L). Based on these findings, the most appropriate intervention for the nurse to implement is to administer a PRN dose of albuterol. Albuterol is a bronchodilator medication commonly used in the treatment of asthma to relieve bronchospasm and improve airflow.