Insights Into the Pathophysiology of Cellulite: A Review.

BACKGROUND: The etiology of cellulite is unclear. Treatment of cellulite has targeted adipose tissue, dermis, and fibrous septae with varying degrees of success and durability of response. OBJECTIVE: Results from clinical trials that target different anatomical aspects of cellulite can provide insights into the underlying pathophysiology of cellulite. MATERIALS AND METHODS: A search of the PubMed database and ClinicalTrials.gov website was conducted to identify clinical trials that have investigated treatments for cellulite. RESULTS: A lack of trial protocol standardization, objective means for quantification of improvement and reported cellulite severity, and short-term follow-up, as well as variation in assessment methods have made comparisons among efficacy studies challenging. However, the lack of durable efficacy and inconsistency seen in clinical results suggest that dermal or adipose tissue changes are not the primary etiologies of cellulite. Clinical studies targeting the collagen-rich fibrous septae in cellulite dimples through mechanical, surgical, or enzymatic approaches suggest that targeting fibrous septae is the strategy most likely to provide durable improvement of skin topography and the appearance of cellulite. CONCLUSION: The etiology of cellulite has not been completely elucidated. However, there is compelling clinical evidence that fibrous septae play a central role in the pathophysiology of cellulite.

Increased Tattoo Fading in a Single Laser Tattoo Removal Session Enabled by a Rapid Acoustic Pulse Device: A Prospective Clinical Trial.

BACKGROUND AND OBJECTIVES: The ability to provide improved tattoo fading using multiple laser passes in a single office laser tattoo removal session is limited. In part, this is due to the loss of laser effectiveness caused by epidermal and dermal vacuole "whitening" generated during the initial laser pass at the tattoo site. The Rapid Acoustic Pulse (RAP) device generates acoustic shock wave pulses that clear epidermal and dermal vacuoles to enable multiple laser passes in a single office laser tattoo removal session. The objectives of this study were to determine if the RAP device, when used as an accessory to the 1064 nm Nd:YAG Q-switched (QS) laser can enable delivery of multiple laser passes in a single office laser tattoo removal session, and therefore result in increased tattoo fading compared to the clinical standard single-pass QS laser tattoo removal session. STUDY DESIGN/MATERIALS AND METHODS: The RAP device was evaluated in a single-center (SkinCare Physicians), prospective, IRB approved study. A total of 32 black ink tattoos, from 21 participants, were divided into three zones and treated with either multiple QS laser passes, each followed by 1 minute of RAP device application (Laser + RAP) in zone one and single-pass QS laser treatment (Laser-Only) in zone two, separated by an untreated control zone. The treatment sites were assessed for the number of laser passes and adverse events immediately, 6 weeks, and 12 weeks following the treatment session. Photographs of the treatment sites were assessed for percent fading at 12 weeks post-treatment by three blinded reviewers. RESULTS: When the RAP device was applied as an accessory to the QS laser in a multi-pass laser tattoo removal treatment, an average of 4.2 laser passes were delivered in a single session, with no unexpected or serious RAP device-related adverse events. At the 12-week follow-up, tattoos treated with Laser + RAP showed a statistically significant increase in average fading (44.2%) compared with tattoos treated with Laser-Only (24.8%) (P < 0.01). Additionally, a significantly higher overall proportion of tattoos treated with Laser + RAP (37.5%) had a response of >50% fading compared with tattoos treated with QS Laser-Only (9.4%) (P < 0.01) as well as a response of >75% fading from Laser + RAP treatment (21.9%) compared with Laser-Only treatment (3.1%) (P < 0.05). CONCLUSIONS: The RAP device, applied as an accessory to the 1064 nm Nd:YAG QS laser, safely enables multiple QS laser treatments in a single office laser tattoo removal session by clearing the whitening caused by the previous QS laser pass. Enabling multiple QS laser passes results in a statistically significant increase in tattoo fading in a single office laser tattoo removal session compared to the clinical standard single-pass QS laser tattoo removal session. © 2019 The Authors. Lasers in Surgery and Medicine Published by Wiley Periodicals, Inc.

Clinical effect of a single pulsed dye laser treatment of fresh surgical scars: randomized controlled trial.

BACKGROUND: Pulsed dye laser has been used to decrease erythema and telangiectasia associated with scars, including surgical scars. There is limited evidence indicating improved surgical scar appearance if pulsed dye laser treatments are commenced immediately at the time of suture removal. OBJECTIVE: To determine whether a single one-pass pulsed dye laser treatment at the time of suture removal can improve the appearance of surgical scars. METHODS: Randomized controlled trial enrolling 20 patients (complete data for 17 patients) at two geographic sites, with blinded ratings of pre- and post-treatment photographs obtained at various time points. Included patients underwent elliptical excision for atypical nevi of the trunk and/or extremities, with at least one resulting scar of at least 5 cm in length or two scars of at least 2.5 cm in length. For each patient, each scar or half-scar (if a larger scar was used) was randomized to treatment or control groups. Treatment scars received a single one-pass treatment with a 595 nm pulsed dye laser (Vbeam, Candela Corporation, Wayland, MA, USA) at the time of suture removal (ie, 2 weeks after excision) at the following parameters: 7 J/cm2 fluence, 7 mm spot size, 1.5-millisecond pulse duration, and 30-millisecond spray, 20-millisecond delay of dynamic cooling. The treatment area included 1 cm on either side of the scar, and the round laser spots were overlapped 10%. Control scars were not treated with laser. RESULTS: Immediate purpura was induced from the laser treatment Six weeks after laser treatment, no significant difference was found in the clinical appearance of surgical scars treated with a single pulsed dye laser treatment on suture removal day versus those surgical scars not treated with laser. Parameters on which no significant difference was found included visibility of incision, erythema, hyperpigmentation, hypopigmentation, induration, and atrophy. Both sets of scars improved over time. CONCLUSIONS: A single pulsed dye laser treatment at the time of suture removal does not appear to have a beneficial effect on clinical scar appearance. The point of minimal benefit for such laser treatments may lie somewhere between one and three treatments.