Final answer:
The most appropriate nursing intervention for a client experiencing an asthma attack and shortness of breath is to place the head of the bed in a Fowler position to facilitate easier breathing.
Step-by-step explanation:
When planning care for a client experiencing an asthma attack, addressing shortness of breath is critical. The most appropriate nursing intervention would be to place the head of the bed in a Fowler position. This position involves the client sitting upright (typically at a 45- to 60-degree angle) which facilitates easier breathing by maximizing lung expansion and reducing the work of breathing. Other interventions, such as reducing external stimuli, using relaxation techniques, and assessing the level of anxiety are also important but secondary to ensuring the client can breathe effectively.