Novel Expanded Safe Zone for Reduction of Submental Fullness with ATX-101 Injection

ATX-101 (deoxycholic acid injection; Kybella) provides an approved nonsurgical treatment option for reduction of submental fullness caused by submental fat. Current one-size-fits-all recommendations for the use of ATX-101 limit treatment to a central area, which may not provide complete resolution of submental fat for some patients. An expanded safe zone is described, allowing for individualized, comprehensive treatment of submental fat with ATX-101 according to each patient's anatomy and desired outcomes.

A retrospective review was conducted of patients treated with ATX-101 for excess submental fat between June of 2015 and December of 2016 at a single plastic surgery practice. The expanded safe zone was developed to isolate the distinct fat compartments of the submental area and includes a no-treatment zone to avoid the marginal mandibular nerve. The extent of ATX-101 treatment required in each zone was determined by assessment of subcutaneous adipose tissue. A 1-cm grid was used to mark the treatment area before injection of ATX-101 (2 mg/cm). Improvement (defined as decreased palpable and/or visible submental fullness) was determined at least 4 months after the final treatment. Adverse events were recorded at each visit and reported by patients by means of telephone.

Overall, 167 patients were included in this analysis. Improvement in submental fullness was achieved in 160 of 167 patients (95.8 percent). The majority of adverse events consisted of temporary injection-site edema, numbness, and tenderness.

An understanding of submental anatomy and careful assessment of each patient's submental fat allows for individualized treatment with ATX-101 beyond the central region of the neck without increased risk of adverse events.

Therapeutic, IV.