Tissue Fillers for the Nasolabial Fold Area: A Systematic ...

06 May.,2024

 

Tissue Fillers for the Nasolabial Fold Area: A Systematic ...

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Tissue fillers injections remain to be one of the most commonly performed cosmetic procedures. The aim of this meta-analysis was to systematize and present available data on the aesthetic outcomes and safety of treating the nasolabial fold area with tissue fillers. We conducted a systematic review of randomized clinical trials that report outcomes concerning treatment of nasolabial fold area with tissue fillers. We searched the MEDLINE/PubMed, ScienceDirect, EMBASE, BIOSIS, SciELO, Scopus, Cochrane Controlled Register of Trials, CNKI and Web of Science databases. Primary outcomes included aesthetic improvement measured using the Wrinkle Severity Rating Scale score and Global Aesthetic Improvement Scale. Secondary outcomes were incidence rates of complications occurring after the procedure. At baseline, the pooled mean WSRS score was 3.23 (95% CI: 3.20–3.26). One month after the procedure, the pooled WSRS score had reached 1.79 (95% CI: 1.74–1.83). After six months it was 2.02 (95% CI: 1.99–2.05) and after 12 months it was 2.46 (95% CI: 2.4–2.52). One month after the procedure, the pooled GAIS score had reached 2.21 (95% CI: 2.14–2.28). After six months, it was 2.32 (95% CI: 2.26–2.37), and after 12 months, it was 1.27 (95% CI: 1.12–1.42). Overall, the pooled incidence of all complications was 0.58 (95% CI: 0.46–0.7). Most common included lumpiness (43%), tenderness (41%), swelling (34%) and bruising (29%). Tissue fillers used for nasolabial fold area treatment allow achieving a satisfying and sustainable improvement. Most common complications include tenderness, lumpiness, swelling, and bruising.

The aim of this systematic review with meta-analysis was to systematize and present available data on the aesthetic outcomes of treating the nasolabial fold area with tissue fillers and compare the effectiveness and safety of various types of tissue fillers.

Evidence-based medicine (EBM) is currently a gold-standard approach in making decisions concerning the care of individual patients, also in plastic surgery [ 9 ]. Despite the importance of EBM, it is only now being introduced into aesthetic medicine [ 10 ]. Therefore, it seems timely to conduct a systematic review with meta-analyses to further evaluate available tissue fillers. This will allow us to determine the appropriate treatment for the nasolabial fold area for each patient in the future and assess its safety.

The nasolabial fold begins at the junction of the ala nasi, the cheek, and the upper lip and extends in either a straight, convex, or concave shape and ends below and lateral to the corner of the mouth. Its correction was reported to be difficult to achieve by a surgical procedure [ 8 ]. Currently, nasolabial fold area wrinkles are most commonly treated with tissue fillers.

During aging, the skin undergoes significant changes, collagen becomes fragmented, and its amount decreases; this hinders the interaction between extracellular matrix and fibroblasts, which leads to further deterioration [ 1 ]. Various factors can substantially accelerate this process, including ultraviolet exposure leading to rhytids, lentigines, telangiectasias, mottled pigmentation, coarse texture, laxity, and loss of translucency [ 2 ]. There are multiple strategies available to prevent and treat premature aging: cosmetological care, topical agents, invasive procedures (i.e., peelings, wrinkle correction, laser rejuvenation), and systemic agents (antioxidants and hormone replacement therapy) [ 3 ]. However, the use of tissue fillers remains one of the most performed non-surgical aesthetic procedures in the world [ 4 ]. Tissue fillers are currently being used for facial areas (e.g., folds, lip augmentation, depressed scars, enhancement of facial contours), as well as non-facial areas (neck, décolleté, hands) [ 5 ]. Most popular tissue fillers include hyaluronic acid (HA), calcium hydroxyapatite (CaHA), collagen-based products (porcine, bovine, and human-derived), and poly-L-lactic acid (PLLA) [ 6 ]. Selecting the appropriate filler is crucial in achieving satisfactory, predictable, and sustainable results [ 7 ].

Calculations were conducted using MetaXL analysis version 2.0 EpiGear Pty Ltd (Wilston, Queensland, Australia) for the multi-categorical pooled prevalence of different types of complications. Comprehensive Meta-Analysis version 3.0 by Biostat (Englewood, NJ) was used to analyze the morphometric data. The statistical analysis was based on a random-effects model. In case of lacking standard errors or standard deviations of means, they were estimated using a predictive method proposed by Ma et al. [ 12 ].

The Cochrane risk of bias tool (RoB) was used to assess the quality of RCTs included in this meta-analysis. There are seven main domains included in the Cochrane RoB tool: sequence generation, allocation concealment, blinding of participants and personnel, blinding of outcome assessment, incomplete outcome data, selective outcome reports, and other bias. Each domain in each study can be assessed as “high risk of bias”, “low risk of bias”, or “unclear”. Depending on the risk of bias assessment for specific domains overall, each study’s risk of bias was classified as low if all criteria were met (i.e., low risk of bias for each domain) or one criterion was unclear. Alternatively, studies were classified as high risk of bias if one criterion was not met (i.e., high risk of bias for one domain) or two or more criteria were unclear. The risk of bias assessment across studies is presented in Supplementary Material 3.

The following data were extracted from these studies: publication year, study design (double-blinded/single-blinded/non-blinded/single-center/multi-center), location (country), follow-up in months, race, sex (% of women), mean/median age, sample (n), filler type, filler concentration, the amount of filler being injected, location of injection, needle, eventual touch-up injections, the method of injection, GAIS score, WSRS score, overall complications incidence rate and specific complications incidence rate [redness, bruising, swelling, pruritus, skin induration, skin discoloration, pain, nodulus, hematoma, infection, vascular adverse events (AE), migration, numbness and lumpiness]. We have extracted all complications reported in each study. However, if a specific complication was reported in more than one study, a meta-analysis was conducted.

The members of the review team extracted data. Articles in a language other than English were translated into English before the data were extracted. When an assessment of WSRS, GAIS, or complications was conducted by patients and a Medical Doctor/Investigator, results derived from a Medical Doctor/Investigator were considered in the presented meta-analysis. If the assessment of WSRS, GAIS, or complications was conducted by a blinded or a not-blinded investigator, the results from a blinded investigator were included in the meta-analysis.

Three independent reviewers performed an eligibility assessment for the relevant full-text articles that were found during the search process. At least two authors assessed each article. We included only prospective randomized clinical trials, reporting data on the treatment of the nasolabial area, which included the Wrinkle Severity Rating Scale (WSRS) score or Global Aesthetic Improvement Scale (GAIS) or complications occurring after the procedure. We excluded studies without a precise description of used dermal filler (for instance, type of the hyaluronic acid used), studies reporting aesthetic improvement results in accordance with other scales than WSRS or GAIS, conference papers, reviews, video articles, case reports, and other studies without relevant data. In case of a lack of agreement between reviewers, a consensus was reached by the whole review team.

This study was compliant with the guidelines of the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) (Supplement 1) [ 11 ]. Our strategy aimed to find relevant randomized clinical trials investigating the treatment of nasolabial fold area with tissue fillers. A wide search using the MEDLINE/PubMed, ScienceDirect, EMBASE, BIOSIS, SciELO, Scopus, Cochrane Controlled Register of Trials, CNKI, and Web of Science databases was performed until March 3, 2019. The PubMed search strategy is presented in Supplement 2. We did not include any date or language filters. The following terms were combined using Boolean operators “AND” and “OR” and used to conduct a search: “hyaluronic acid”, “dermal filler”, “Hydroxyapatites”, “CaHA”, “Radiesse”, “Polymethyl Methacrylate”, “Injectable filler”, “injectables”, “Polyalkylimide”, “Poly-L-lactic”, “facial”, “nasolabial”, “cosmetic*”, “naso-labial” and “marionette”. We also performed an extensive reference search in the acquired articles for any additional relevant publications.

Overall, the pooled incidence of all complications was 0.58 (95% CI: 0.46–0.7). Among studies reporting the overall complications rate, it was 0.59 (95% CI: 0.46–0.72) for all HA fillers, 0.59 (95% CI: 0.36–0.8) for monophasic HA fillers, 0.6 (95% CI: 0.43–0.76) for biphasic HA fillers, 0.4 (95% CI: 0.12–0.7) for all Collagen fillers, 0.82 (95% CI: 0.69–0.93) for Mesoglow, and 0.88 (95% CI: 0.72–0.99) for IAL-systems. Pooled incidences of specific complications (i.e., redness, bruising, swelling, pruritus, skin induration, tenderness, skin discoloration, pain, nodulus, hematoma, infection, vascular adverse events, migration, numbness, and lumpiness) are presented in Table .

During follow-up examination after a half-month period since the procedure pooled mean GAIS score was 3.21 (95% CI: 3.11–3.32). After the 1 month since the injection, it was 2.21 (95% CI: 2.14–2.28). Two months after the procedure, the pooled mean GAIS score had reached 2.47 (95% CI: 2.43–2.52). At 3, 4, and 5 months since the treatment, the pooled mean GAIS scores were 2.32 (95% CI: 2.21–2.44), 2.24 (95% CI: 2.2–2.29), and 2.78 (95% CI: 2.6–2.96), respectively. At the 6-, 9- and 12-month time points, the pooled mean GAIS scores were 2.32 (95% CI: 2.26–2.37), 1.68 (95% CI: 1.52–1.83), and 1.27 (95% CI: 1.12–1.42), respectively. Pooled mean GAIS scores for specific groups of tissue fillers are presented in Table and Fig. .

At baseline, the pooled mean WSRS score was 3.23 (95% CI: 3.20–3.26). After the first week since the injection, it was 2.91 (95% CI: 2.82–2.99). At half-month since the initial procedure, the pooled mean WSRS score had dropped to 1.78 (95% CI: 1.72–1.85). One month after the procedure, the pooled WSRS score had reached 1.79 (95% CI: 1.74–1.83). After 2 months, it was 1.64 (95% CI: 1.6–1.68). At 3-, 4-, and 5-month follow-ups, the reported pooled mean WSRS scores were 2.03 (95% CI: 1.97–2.1), 1.68 (1.65–1.72), and 1.59 (95% CI: 1.42–1.76), respectively. A meta-analysis of longer-term follow-up outcomes revealed pooled mean WSRS scores of 2.02 (95% CI: 1.99–2.05), 2.25 (95% CI: 2.18–2.31), and 2.46 (95% CI: 2.4–2.52) for examinations after 6, 9, and 12 months from the filler injection. Pooled mean WSRS scores for specific groups of tissue fillers are presented in Table and Fig. .

A total of 4097 patients were included in this meta-analysis. Included studies were published between 2004 and 2019 [ 14 – 64 ]. They were conducted in Canada (two studies, 252 participants), China (four studies, 304 participants), France (two studies, 162 participants), Germany (seven studies, 342 participants), Italy (two studies, 139 participants), Norway (one study, 68 participants), South Korea (13 studies, 749 participants), Spain (one study, 60 participants), Sweden (two studies, 110 participants), Switzerland (one study, 126 participants), the UK (two studies, 80 participants), the United Arab Emirates (one study, 40 participants), and the USA (17 studies, 1945 participants). Overall, 35 studies including 3388 patients were conducted in multiple centers, and 16 single-center studies including 709 patients. WSRS scores were reported by 19 studies, including 1155 patients; GAIS scores were reported by 11 studies including 686 patients; and 39 studies including 3281 patients, reported data on complications. All characteristics of the included studies are presented in Table . The quality of the analyzed studies, according to the Cochrane RoB tool, is low.

Discussion

The presented study is one of the first attempts to conduct a comprehensive summary of available randomized clinical trials on tissue fillers, including HA, as well as other fillers, such as collagen, PLA, PCL, Mesoglow, IAL-system, and autologous fat. The focus was on the nasolabial fold, as it is one of the most common locations for tissue fillers injections [65]. Moreover, injecting soft tissue fillers remained one of the most commonly performed cosmetic minimally invasive procedures [66]. Therefore, the relevancy of this meta-analysis cannot be overstated. The search strategy also included marionette folds; however, we did not find available studies to meet our search criteria.

Our results include outcomes on aesthetic improvement measured using WSRS and GAIS scales, as well as a summary of complications following filler injections into the nasolabial fold area. WSRS and GAIS scales were chosen by authors based on the frequent inclusion of them in randomized clinical trials and straightforward interpretation of the results.

We believe that our study is the most comprehensive and current analysis of randomized clinical trials on dermal fillers, conducted according to the EBM principles. To the best of our knowledge, this is the first such comprehensive study to gather and summarize the details of injection techniques and maneuvers used in the nasolabial area.

Although the dermal fillers injections are generally considered safe, some adverse events can occur. Clinicians should have comprehensive knowledge of the possible adverse reactions and be experienced in performing injections with correct technique. Due to the high diversity of available products, the injection techniques may vary. Despite that, the Global Aesthetics Consensus Group attempted to list general principles to minimize the risk of complications [67]. For example, the authors stressed that HA can be administered safely through both needle and cannula; however, it is recommended to use cannulas in the areas susceptible to vascular complications. Care should be taken to aspirate before injection to minimize the risk of intravascular injection. The decision on selection of the appropriate depth of injection should depend on the type of filler and instructions given by manufacturer. In general, HA gels should be injected intradermally or subdermally. It is important not to inject too superficially to avoid the formation of lumps [68]. However, in case of less reticulated gels and/or gels with lower concentrations of HA more superficial injections may be favorable [69]. In the vast majority of included studies clinicians used linear threading or multiple punctures technique and injected HA in the mid- to deep-dermis layer with 27- and 30-gauge needles, what seems to agree with the principles mentioned above.

Among studies included in presented meta-analysis injection volume was in general below 2 ml per nasolabial fold. Most commonly concentration of the HA oscillated around 20 mg/ml. In case of injection technique, in studies included, it was performed most commonly using 27G or 30G needle in the mid-dermal region using methods described as linear threading, single puncture, retrograde injection, etc. Unfortunately, definitions of injection methods are imprecise, often mean the same or differ despite the description used. The statistical analysis of aesthetic outcomes or complications based on injection methods described without a prior precise classification seems to be impossible.

According to the meta-analysis of reported WSRS scores, patients receive immediate significant improvement for any type of filler, which is observable already during the first follow-up appointment. This positive outcome was the most observable for HA, collagen, PLA, PCL, and autologous fat implantation. Improvement in the WSRS score reached its peak approximately 3–5 months after the procedure and then gradually subsided.

According to the results of the GAIS scores meta-analysis, patients also receive a significant improvement after administering HA, collagen, PLA, and autologous fat implantation. Pooled GAIS scores were highest during the first follow-up examination and then progressively decreased.

A previous meta-analysis by Huang et al. concerning safety and efficacy of HA for nasolabial folds reported improvement in the WSRS score at the 6-month follow-up of 1.21 [70]. Our results report a difference of 1.15 between baseline and 6-month follow-up for all HA fillers, which is comparable. The small difference might result from the fact that Huang et al. also included non-randomized studies, which might have heightened the results in their review. A meta-analysis by Wang et al. of randomized clinical trials investigating the treatment of nasolabial folds using HA with lidocaine reported HA with lidocaine is more effective, when dealing with pain after the injection. There was no difference in product effectiveness and safety [71]. We have decided not to analyze the role of lidocaine in our meta-analysis. However, we believe that its impact on aesthetic outcomes and overall safeness is minor, which is confirmed by the study mentioned above.

Overall, the pooled incidence of complications was 58%. The highest reported total complications rates were for Mesoglow (82%) and IAL-system (88%). However, it is important to notice that outcomes of treatment with Mesoglow and IAL-system were reported by very few studies. Analysis of incidence among specific complications revealed that most common are mild, transient, and reversible. They include lumpiness (43%), tenderness (41%), swelling (34%), bruising (29%), pain (28%), and redness (26%). More severe complications that could potentially lead to irreversible damage occur very sporadically. The pooled incidence of infections was 1%, and the pooled incidence of vascular adverse events was also 1%. These results are mostly consistent with previously published research. Abduljabbar et al. reported that injection-related side effects are the most common and usually transient, whereas vascular occlusion is the most severe complication, which is associated with hyaluronic acid filler injection [72]. A meta-analysis by Huang et al. presented incidence rates of specific complications after HA treatment for nasolabial folds, which were comparable to reported in this study: for example, redness (28.7%), swelling (37.3%), bruising (24.7%), and pruritus (11.5%) [70]. Meta-analysis concerning vascular events occurring after facial filler injections by Sito et al. reported that vascular adverse events causing injury to ophthalmic and retinal arteries could result in irreversible damage [73]. To avoid these complications, physicians administering facial tissue fillers injections should have appropriate training and extensive knowledge of facial anatomy with a particular focus, but not limited to vascular anatomy. As Dr. Foad Nahai mentioned in his letter, many patients believe that fillers are 100% safe and tend to overlook potential dangers [74]. There are multiple reports describing cases of vascular occlusion after injecting tissue filler in the nasolabial fold-area [75–77]. The risk seems to be higher in patients with history of cosmetic rhinoplasty [78]. Unfortunately, vascular adverse events associated with potential skin necrosis can occur even, if patients are treated by experienced practitioners. Usually vascular occlusion presents with pain and ischemic pallor but often the symptoms may be atypical [79]. According to Lee et al., Doppler ultrasound could be useful for the prevention of vascular complications during filler injections into nasolabial folds [80]. Introducing immediate treatment in this cases is crucial. Most commonly resolution of symptoms is achieved by administering hyaluronidase [81, 82]. In reality, we do not have successful treatments for complications resulting from vascular occlusion with tissue fillers not treated instantaneously, which can cause blindness, skin necrosis, or stroke.

This systematic review with meta-analysis is associated with several limitations. There is a high level of heterogeneity among the included studies, which certainly limits the precision and generalizability of the results. Studies were conducted in multiple countries, and the methodology used differed substantially. We decided to include as much data as possible to create as many comprehensive reports as possible. Also, we included studies using only the two most common aesthetic improvement scales (WSRS and GAIS). Studies using other scoring systems were excluded, which is a potential source of selection bias. We were also unable to assess the injection method and volume or concentration of the filler used, due to the lack of appropriate information in many available studies. The physician/surgeon’s technical proficiency performing the procedures could also have a great impact on the outcomes of the treatment [83]. Additionally, it is important to consider that several fillers (PLA, PCL, Mesoglow, IAL-systems, and Autologous fat) were underrepresented in published studies. Therefore, results concerning these treatments might be less precise.

Researchers investigating this subject in the future should consider conducting studies using aesthetic improvement measurement methods that are validated and widely used. It is also important to introduce definitions of complications and their classification that would be easy to adhere to and be informative when describing outcomes. In certain available studies, over-correction, under-correction, and lack of satisfaction were classified as complications. In our opinion, the definition of complications in aesthetic medicine procedures should be constructed similarly to those used for surgical research. For instance, complications should be defined as an adverse event that occurred within 6 months from the procedure and is not directly associated with the operative technique. This meta-analysis highlights the need for conducting randomized clinical trials for tissue fillers other than HA, which are under-represented in high EBM level studies.

In conclusion, tissue fillers used for nasolabial fold area treatment allow achieving a sustainable (up to 1 year) and satisfying improvement. They are unfortunately associated with complications, most common being tenderness, lumpiness, swelling, and bruising. Most mentioned complications seem to be relatively mild and subside in time.

Hyaluronic Acid Fillers Pipeline by Development Stages, ...

Hyaluronic Acid Fillers Pipeline Market Report Overview

Hyaluronic Acid (HA) is a glycosaminoglycan disaccharide, which exists naturally in the body. Approximately 50% of the total HA is found in the skin. Injections of HA are used for reducing wrinkles in the face and for soft tissue augmentation.

The hyaluronic acid fillers pipeline market research report provides a comprehensive understanding of the pipeline products along with their comparative analysis at various stages of development. The report also includes information about the territories wherein the clinical trials are in progress, the regulatory paths followed by the trials, and the companies associated with the trials.

Key Segments ·        Biphasic Hyaluronic Acid Fillers

·        Monophasic Hyaluronic Acid Fillers

Key Territories ·        The US

·        Europe

·        China

·        South Korea

·        Hong Kong

Key Regulatory Paths ·        PMA

·        CE

·        NMPA

·        NIFDS

·        510(k)

Leading Companies ·        Allergan Aesthetics

·        Almirall Ltd

·        Aquavit Pharmaceuticals Inc

·        BioPlus Co Ltd

·        CollPlant Biotechnologies Ltd

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Hyaluronic Acid Fillers Pipeline Market Segmentation by Segments

The key segments for the hyaluronic acid fillers pipeline market are biphasic hyaluronic acid fillers and monophasic hyaluronic acid fillers. As of March 2024, biphasic hyaluronic acid fillers accounted for the highest share of pipeline products.

Hyaluronic Acid Fillers Pipeline Market Analysis by Segments, 2024 (%)

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Hyaluronic Acid Fillers Pipeline Market Segmentation by Territories

A few of the key territories for the hyaluronic acid fillers pipeline market are the US, Europe, China, South Korea, and Hong Kong. As of March 2024, the US accounted for the highest number of pipeline products.

Hyaluronic Acid Fillers Pipeline Market Analysis by Territories, 2024 (%)

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Hyaluronic Acid Fillers Pipeline Market Segmentation by Regulatory Paths

A few of the key regulatory paths in the hyaluronic acid fillers pipeline products market are PMA, CE, NMPA, NIFDS, and 510(k). As of March 2024, PMA was the most followed pathway for pipeline products in the market.

Hyaluronic Acid Fillers Pipeline Market Analysis by Regulatory Paths, 2024 (%)

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Hyaluronic Acid Fillers Pipeline Market – Competitive Landscape

A few of the key companies associated with the hyaluronic acid fillers pipeline market are Allergan Aesthetics, Almirall Ltd, Aquavit Pharmaceuticals Inc, BioPlus Co Ltd, CollPlant Biotechnologies Ltd, among others.

Almirall Ltd: It is headquartered in Uxbridge, Middlesex, the UK. Almirall is a biopharmaceutical company that develops healthcare solutions for dermatology indications. The company offers actikerall cutaneous solution, aknemycin plus cutaneous solution, and balenum dry skin and itch relief cream, among other other products.

CollPlant Biotechnologies Ltd: CollPlant is headquartered in Rehovot, Israel. It is a regenerative and aesthetic medicine company that focuses on developing technologies and products for tissue regeneration and organ manufacturing. The company’s rhCollagen technology is also used in its commercial products, which are available in the European market. CollPlant’s products are used in various applications, including drug discovery, personalized medicine, and medical aesthetics.

Hyaluronic Acid Fillers Pipeline Market Analysis by Companies, 2024

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Segments Covered in the Report

Hyaluronic Acid Fillers Pipeline Market Segments Outlook

  • Biphasic Hyaluronic Acid Fillers
  • Monophasic Hyaluronic Acid Fillers

Hyaluronic Acid Fillers Pipeline Market Territories Outlook

  • The US
  • Europe
  • China
  • South Korea
  • Hong Kong

Hyaluronic Acid Fillers Pipeline Market Regulatory Paths Outlook

  • PMA
  • CE
  • NMPA
  • NIFDS
  • 510(k)

Scope

This report provides:

  • Extensive coverage of the hyaluronic acid fillers under development.
  • Exhaustive list of major pipeline products and their details, including product description, licensing and collaboration details, and other developmental activities.
  • Reviews of major players involved in the development of hyaluronic acid fillers and lists all their pipeline projects.
  • Coverage of pipeline products based on various stages of development ranging from early development to approved/issued stage.
  • Key clinical trial data of ongoing clinical trials specific to pipeline products.
  • Recent developments in the segment/industry.

Reasons to Buy

  • Formulate significant competitor information, analysis, and insights to improve R&D strategies.
  • Identify emerging players with potentially strong product portfolios and create effective counter strategies to gain a competitive advantage.
  • Identify and understand important and diverse types of hyaluronic acid fillers under development.
  • Develop market-entry and market-expansion strategies.
  • Plan mergers and acquisitions effectively by identifying major players with the most promising pipeline.
  • Carry out an in-depth analysis of the product’s current stage of development, territory, and estimated launch date.

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