Final answer:
The next most appropriate step for a 45-year-old woman presenting with panic attacks, depressive symptoms, and excessive worry for the past 6 months would be to refer the patient to a psychiatrist.
Step-by-step explanation:
The next most appropriate step for a 45-year-old woman presenting with panic attacks, depressive symptoms, and excessive worry for the past 6 months would be to refer the patient to a psychiatrist. This is important because the symptoms mentioned can be indicative of a mental health disorder, such as panic disorder or major depression. A psychiatrist specializes in diagnosing and treating these types of conditions and can provide the most appropriate treatment options, which may include psychotherapy and/or medication.