Final answer:
The most appropriate nursing intervention for the patient's symptoms associated with stress is to direct them in slow and deep breathing to help reduce tachycardia and high blood pressure by activating the parasympathetic nervous system.
Step-by-step explanation:
Given the patient's reported stress about potential job loss and the associated physiological symptoms of an elevated heart rate (tachycardia), increased respirations, and high blood pressure, the most appropriate nursing intervention is to direct the patient in slow and deep breathing. Slow and deep breathing exercises can help activate the parasympathetic nervous system, which will counteract the sympathetic surge that occurs in response to stress, potentially reducing both heart rate and blood pressure. This immediate, non-pharmacological intervention can offer quick relief and is a recognized method to calm anxiety. The patient's vital signs suggest acute stress response, and the best immediate intervention in the options provided is B: Direct the patient in slow and deep breathing via use of a positive, repeated. While other suggestions may be beneficial in a long-term management plan, they do not address the immediate need to stabilize the patient's physiological response to stress.