Final answer:
The wheezing becoming louder is an assessment finding that indicates improvement after treatment for an acute asthma exacerbation.
Step-by-step explanation:
The assessment finding that indicates a client with an acute asthma exacerbation is beginning to improve after treatment is that the wheezing becomes louder. When the airways are narrowed and inflamed during an asthma attack, wheezing is often heard. As the airways open up and become less constricted due to treatment, the wheezing becomes louder and more pronounced as air is able to pass through more easily.
Vesicular breath sounds are normal breath sounds; a decrease in vesicular breath sounds would not be a positive sign. Nurses also look for clinical signs such as reduced chest tightness, the ability to complete sentences without gasping for air, and normalizing pulse and oxygen saturation levels.