摘要

Objectives: To demonstrate clinical and ultrasound evidence of the effectiveness of a multi-layer application of high-intensity microfocused ultrasound for the treatment of sagging and fat in the submental region. Introduction: Double chin is the result of changes in the skin, subcutaneous tissue (fat) and muscles of the submental region. The use of microfocused ultrasound in multiple layers in this region theoretically allows the treatment of these alterations that are at different depths. Clinical evaluation with the aid of three-dimensional and ultrasound imaging systems can be objective tools to confirm the effectiveness of this treatment. Materials / method: Twelve individuals with CR-SMFRS 2 to 4 were selected, all female. Patients underwent a single session of microfocused ultrasound with the association of linear applicators and pen. The treatment was performed in multilayers: 800 shots with the 7.0mm pen (1.2J), 45 lines of 4.5mm (1.2J), 45 lines of 3.0mm (0.6J) and 800 shots with the 2.0mm pen (0.5 J). Three-dimensional photographs and ultrasound examination were repeated at 6 weeks. In the ultrasound evaluation, an average measurement of preplatysmal fat was used at 9 standardized points in the submental region. Results: All subjects showed improvement in double chin 6 weeks after the single session of microfocused ultrasound. Ultrasound evaluation demonstrated a mean reduction of 1.2cm (0.3 - 2.34%) in submental fat. The percentage reduction ranged from 6 to 27% (average of 16%). Analysis of the three-dimensional images identified an improvement of one degree in CR-SMFRS in 8 patients and of two degrees in 4 of them. Only mild adverse effects (erythema and local pain) were observed. Conclusion: The application of multi-layer microfocused ultrasound demonstrated efficacy for the treatment of double chin through three-dimensional clinical images and ultrasound evaluation of preplatysmal fat.