She also recommends scheduling patients with DI for the end of the day and arranging frequent follow-up visits. “Making them feel valued is the bottom line,” she emphasized. “Remember: They’re less likely to respect socially defined boundaries like time constraints, so you do have to set boundaries, and don’t take what they may say to you personally. You’re not going to be able to care for that individual unless you do that. They may appear defiant, frustrated, and angry, but the fact that they showed up in your office means that you can help that person.”
Phase 2 of care for these patients consists of building a therapeutic rapport by greeting them with a smile and positive attitude and using welcoming body language such as sitting side-by-side during the office visit as opposed to face-to-face, “so it’s a less aggressive approach,” she said. Next, ask about their goal with a question such as, “Is it more important for you to find the bug/virus or to improve your condition?”
During the visit, “you’re continually shifting from etiology — which they are desperate to understand — to a shared desire for treatment,” Dr. Murase said. “No one knows what causes DI and remember, in medicine we treat patients when the exact etiology is unknown. So, we’re not doing anything that differently. Focus on the effect that the symptoms are having on their life. Say something like, ‘it must be so miserable to be living this way. I really want to help you.’ ”
Phase 3 of care for patients with DI involves performing a thorough history and physical exam. The initial office visit should include a full body exam to rule out any underlying dermatologic condition that may be causing the sensation they’re complaining about. She cited a retrospective study of 108 patients who presented to the Mayo Clinic with DI as the main reason for their office visit. Of the 80 patients who had a biopsy, 61% had chronic dermatitis; 48% had excoriation, ulceration, or erosion; and 31% had nonspecific dermal inflammation.
Whether to perform a biopsy or not is controversial, Dr. Murase added, because it’s probably not going to change the clinical impression or diagnosis. “If you agree to do the biopsy, get a verbal contract with the patient,” she advised. “You might say, ‘We’re going to do this. You’re going to choose the site, we’re going to do a biopsy, but we are going to be in agreement here that, if we can’t find the etiology, that you will still be open to going on therapy.’ This is important because it establishes a therapeutic alliance.”
Since patients with DI often bring in their own specimens, she also recommends providing them with microscope glass slides without cover slips and asking them to use clear tape, not tape that is opaque or matted, to cover the specimen.
To rule out other illnesses and conditions that could be triggering the perceived DI, she said lab tests to consider include a complete blood count, comprehensive metabolic panel, thyroid-stimulating hormone, calcium, hemoglobin A1c, vitamin B12, urinalysis, toxicology screen, HIV/hepatitis C, and rapid plasma reagin.