In the clinical opinion of Alex G. Ortega-Loayza, MD, MCR, few absolutes drive the initial assessment of patients who present with skin ulcers.
Dr. Alex G. Ortega-Loayza
The causes can be neoplastic, infectious, inflammatory, vasculopathic, external, and genetic. “Sometimes they can be of mixed etiology, which make them even more complicated to heal,” Dr. Ortega-Loayza, of the department of dermatology at Oregon Health & Science University, Portland, said during the annual meeting of the Pacific Dermatologic Association.
In a study published in 2019, he and his colleagues at four academic hospitals evaluated characteristics and diagnoses of ulcers in 274 patients with skin ulcers in inpatient dermatology consultation services between July 2015 and July 2018. Most primary teams requesting the consultation (93%) were from nonsurgical specialties. The median age of these patients was 54 years, 45% were male, and 50% had lower-extremity ulcers. Nearly two-thirds of the ulcers (62%) were chronic in nature, while the remaining 38% were acute. The skin ulcer was the chief reason for admission in 49% of cases and 66% were admitted through the ED. In addition, 11% had a superinfected skin ulcer.
The top three etiologies rendered by dermatologists after assessing these patients were pyoderma gangrenosum (17%), infection (13%), and exogenous causes (12%); another 12% remained diagnostically inconclusive after consultation. Diagnostic agreements between the primary team requesting the consultation and the dermatologist were poor to modest.
These data highlights the role of the dermatologists in the workup of skin ulcers of unknown etiology.
“The diagnosis of skin ulcers can be challenging,” Dr. Ortega-Loayza said. “Subjective factors playing a role in the diagnosis of skin ulcers include the type of level of training/experience you’ve had and general awareness and education about skin ulcers.” In addition, there is also a lack of gold-standard diagnostic criteria for atypical/inflammatory ulcers and a lack of specificity of ancillary testing, such as for pyoderma gangrenosum.
Dr. Ortega-Loayza’s basic workup is based on the review of systems and the patient’s comorbidities. Blood work may include CBC, comprehensive metabolic panel, erythrocyte sedimentation rate/C-reactive protein, glucose-6-phosphate dehydrogenase, albumin/prealbumin, autoimmune panels, and hypercoagulable panels. He may order a skin biopsy with H&E staining and microbiological studies, superficial bacterial wound cultures, and vascular studies, such as ankle brachial index (ABI) and chronic venous reflux tests, and Doppler ultrasound, and he might consider an angiogram for certain type of ulcers. Additional imaging studies may include x-ray, CT scan, and/or MRI.
The four key factors to control in patients with skin ulcers, he continued, include effective management of edema (such as compression garments depending on the results of the vascular studies); infection (with topical/oral antibiotics and debridement); the wound microenvironment (with wound dressings), and pain (mainly with nonopioids). “In my practice, we tend to do multilayered compression,” he said. “This can be two- or four-layer. I do light compression if the patient has peripheral arterial disease. I always bring in the patient 2 days later to check on them, or do a telehealth visit, to make sure they are not developing any worsening of the ulcers.”
Infections can be managed with topical antimicrobials such as metronidazole 1% gel and cadexomer iodine. “Iodine can also help dry the wound when you need to do so,” said Dr. Ortega-Loayza, who directs a pyoderma gangrenosum clinic at OHSU. “Debridement can be done with a curette or with commercially available enzymatic products such as Collagenase, PluroGel, and MediHoney.”
When the ulcer is in an active phase (characterized by significant amount of drainage and erythema), he uses one or more of the following products to control the wound microenvironment: zinc oxide, an antimicrobial dressing, a hyperabsorbent dressing, an abdominal pad, and compression.
During the healing phase, with evidence of re-epithelization, he tends to use more foam dressings and continues with compression. His preferred options for managing pain associated with ulcers are medications to control neuropathic pain including initially gabapentin (100 mg-300 mg at bedtime), pregabalin (75 mg twice a day), or duloxetine (extended release, 30 mg once a day). All of these medications can be titrated up based on patients’ needs. Foam dressings with ibuprofen can also provide comfort, he said.
Dr. Ortega-Loayza also provided a few clinical pearls highlighting the role and utility of interleukin-23 inhibitors in the management of patients with pyoderma gangrenosum, oral vitamin K in patients with calciphylaxis, and stanozolol for lipodermatosclerosis. He is also leading the first open-label trial testing a Janus kinase inhibitor – baricitinib – as a treatment for patients with pyoderma gangrenosum.
Dr. Ortega-Loayza disclosed that he is a consultant to Genentech and Guidepoint and is a member of the advisory board for Bristol-Myers Squibb, Boehringer Ingelheim, and Janssen. He also has received research support from Lilly.