The client has an increased anteroposterior chest diameter, dyspnea, and nasal flaring. the most appropriate nursing diagnosis is:

Dyspnea may be defined as the sign of the harmful disease of the lungs, heart or the airway. This onset must not be ignored and requires a proper medical attention.

The individual that has nasal flaring and other symptoms mentioned in the question. This illustrates the ineffective breathing pattern. This may also relate to the hyperventilation. In hyperventilation, the anteroposterior chest diameter increases.

so what is your question?