Final answer:
For a client with bulimia nervosa, the nursing plan should include using a screening tool for depression. Other options, such as adjusting blood pressure medication, reducing vitamin B12, or brisk walking before bedtime, are not appropriate without further clinical justification.
Step-by-step explanation:
A nursing intervention plan for a client with bulimia nervosa who is at 5% above ideal body weight should indeed include using a screening tool to evaluate for depression. Considering the client's history of anxiety and recent Alzheimer's diagnosis, along with the loss of a partner and symptoms of decreased appetite, low energy, and insomnia, these are potential indicators of depression, which is common in individuals with eating disorders.
The nurse should not suggest decreasing the dosage of the client's blood pressure medication without foundational evidence and the direction of a physician. Instructing the client to decrease vitamin B12 intake is also not a priority, as this nutrient is not directly linked to the treatment of bulimia nervosa. Advising vigorous activity before bedtime, like a brisk walk, is not advisable as it may hinder sleep rather than promote it.