Daily Cosmetic Research Analysis
Today’s top cosmetic-medicine papers center on injectable filler safety and device-based facial rejuvenation. New vascular anastomotic routes explain blindness risk from temple injections, a small clinical series proposes heparin/nitroglycerin for PCL filler embolism, and a prospective study shows synchronized RF with HIFES can increase midface muscle thickness and volume.
Summary
Today’s top cosmetic-medicine papers center on injectable filler safety and device-based facial rejuvenation. New vascular anastomotic routes explain blindness risk from temple injections, a small clinical series proposes heparin/nitroglycerin for PCL filler embolism, and a prospective study shows synchronized RF with HIFES can increase midface muscle thickness and volume.
Research Themes
- Filler safety and vascular complications
- Noninvasive facial rejuvenation via energy-based devices
- Clinical management strategies for irreversible fillers
Selected Articles
1. Risk of Blindness From Temple Filler Injections: Investigating Vascular Anastomoses Between the Deep Temporal and Ophthalmic Arteries.
Retrospective angiographic analysis identified four anastomotic routes linking deep temporal arteries to the ophthalmic artery, explaining how temple filler can cause vision loss via retrograde and anterograde flow. The work challenges assumptions about the safety of the supraperiosteal plane and highlights a mechanistic basis for rare but catastrophic complications.
Impact: First mechanistic mapping of deep temporal–ophthalmic anastomoses directly informs injection safety in a high-risk region. It may reshape training and guidelines for temple filler injections.
Clinical Implications: Even with supraperiosteal injections, embolization to the ophthalmic artery is anatomically plausible. Practitioners should minimize bolus volume/pressure, consider cannula orientation and aspiration limits, and prioritize risk communication and emergency protocols.
Key Findings
- Identified four DTA-to-OA anastomotic routes enabling filler migration via combined retrograde and anterograde flow.
- Direct DTA–lacrimal artery anastomosis demonstrated; other routes involve IMAX with subsequent connections (superficial temporal, infraorbital, middle meningeal arteries).
- Findings challenge the presumed safety of the supraperiosteal plane in the temple region.
Methodological Strengths
- Angiographic visualization leveraging cases with enhanced collateralization to reveal rare anastomoses.
- Mechanistic framing (retrograde then anterograde flow) consistent with prior embolic hypotheses.
Limitations
- Small, retrospective, selected angiogram cases limit generalizability and do not quantify risk.
- No interventional validation; anatomical routes inferred without direct filler injection experiments.
Future Directions: Prospective imaging with standardized injection simulations, flow modeling, and cadaveric perfusion to quantify risk by plane, volume, and pressure; translation into practical injection safety protocols.
PURPOSE: Soft-tissue filler injections, particularly hyaluronic acid, are popular for temple volume restoration. Although uncommon, this area poses risk for vision loss from embolic occlusion. Guidelines recommend injecting into the supraperiosteal plane for safety; however, the deep temporal arteries (DTAs) in this plane pose a risk. This study investigates potential pathways from the DTA to the ophthalmic artery (OA) and mechanisms of filler travel. METHODS: Retrospective analysis of carotid angiograms from patients with marked carotid artery stenosis or vascular malformations, given that collaterals are more visible in the presence of vascular blockages. Select cases were identified by the neurosurgery team. RESULTS: Four anastomotic pathways between the DTA and OA were identified, displaying a combination of anterograde and retrograde flow. Case 1 shows direct DTA-lacrimal artery anastomosis. In cases 2 to 4, the DTA is shown originating from the internal maxillary artery (IMAX) following its anatomical course. Retrograde flow from the DTA into the IMAX can then lead to anterograde flow into branches connecting to the IMAX including the superficial temporal artery, infraorbital artery, and middle meningeal artery. These arteries then form collaterals with the OA. CONCLUSIONS: This study is the first to elucidate 4 potential routes for filler-induced OA occlusion originating from DTAs in the supraperiosteal plane. These pathways involve retrograde flow, a mechanism previously suggested for filler-induced occlusion. Notably, the likelihood of these pathways being traversed may be low due to their length and amount of filler volume required; however, it is not impossible.
2. Impact of Synchronized Radiofrequency and High-intensity Facial Electrical Stimulation on Facial Muscles and the Superficial Fascial System in the Midface.
In a 24-week prospective study (n=37), synchronized RF with HIFES increased zygomaticus major thickness, EMG activity, and midface volume, with supportive porcine histology. The multimodal assessments suggest functional and structural rejuvenation of the midface.
Impact: Provides early objective evidence that neuromuscular stimulation synchronized with RF can enhance facial muscle and soft-tissue parameters, informing noninvasive rejuvenation strategies.
Clinical Implications: Clinicians may consider synchronized RF+HIFES for patients seeking noninvasive midface rejuvenation, while counseling on the need for further randomized data and long-term durability evidence.
Key Findings
- Zygomaticus major thickness increased from 2.06 mm to 2.80 mm with 39.3% EMG signal rise, indicating improved muscle function.
- 3D analysis showed horizontal (0.90 mm) and vertical (1.01 mm) skin displacement, with midface volume gain of 1.43 cm³ at 24 weeks.
- Porcine histology demonstrated increased muscle fiber size, myonuclei, and mass density supporting the human findings.
Methodological Strengths
- Prospective design with multimodal objective measurements (ultrasound, EMG, 3D imaging).
- Translational support via porcine histology aligning with human outcomes.
Limitations
- Nonrandomized, single-arm study with modest sample size.
- Follow-up limited to 24 weeks; no durability beyond 6 months or comparative effectiveness data.
Future Directions: Randomized controlled trials comparing RF+HIFES to sham or RF-only, dose–response optimization, and long-term durability/safety assessments.
BACKGROUND: Midfacial aging involves skeletal changes, muscle weakening, and fat redistribution, resulting in volume loss, skin sagging, and deepened nasolabial folds. High-intensity facial electrical stimulation (HIFES) combined with radiofrequency (RF) is a novel noninvasive method for addressing these changes by enhancing muscle mass and remodeling subcutaneous tissue. OBJECTIVES: The goal of this study was to assess the efficacy of HIFES and synchronized RF in improving midfacial aesthetics, specifically muscle thickness, skin displacement, and facial volume. METHODS: This prospective, nonrandomized study included 37 participants who underwent 4 HIFES and RF treatments over 24 weeks. Assessments at baseline, 4, 16, and 24 weeks were performed with ultrasound imaging, electromyography (EMG), 3-dimensional surface imaging, and the Modified Fitzpatrick Wrinkle Scale. A related porcine study evaluated the treatment's histological effects. RESULTS: Zygomaticus major muscle thickness increased from 2.06 mm to 2.80 mm, with a 39.3% rise in EMG signal strength, indicating improved muscle function. Skin displacement analysis revealed horizontal (0.90 mm) and vertical (1.01 mm) shifts, particularly laterally. Midface volume increased by 1.43 cm³ at 24 weeks. The porcine study confirmed increased muscle fiber size, myonucleus count, and mass density, aligning with human results. CONCLUSIONS: HIFES and synchronized RF treatments significantly improved muscle thickness, skin displacement, and facial volume, effectively rejuvenating the midface. These clinical findings, supported by histological evidence, suggest a promising noninvasive approach for facial rejuvenation. Further randomized studies are needed to confirm...
3. The Efficacy of Heparin and Nitroglycerin in Managing Vascular Embolism Complications from Polycaprolactone (PCL) Fillers: A Clinical Study.
In a retrospective series of 10 PCL embolism cases, systemic heparin and topical/systemic nitroglycerin improved perfusion and reduced ischemia with few adverse events. This offers a pragmatic approach for non-hyaluronidase-responsive filler complications.
Impact: Addresses an urgent therapeutic gap for PCL filler embolism where dissolution is not possible, translating animal data into initial clinical practice.
Clinical Implications: For suspected PCL-related ischemia, early anticoagulation (heparin) and vasodilation (nitroglycerin) may be considered alongside standard supportive measures, with imaging-guided monitoring.
Key Findings
- Retrospective clinical series (n=10) showed improved blood flow and reduced ischemia after heparin and nitroglycerin therapy.
- Adverse reactions were minimal across 1 month to 1-year follow-up.
- Provides a management pathway for PCL filler embolism where enzymatic dissolution is not feasible.
Methodological Strengths
- Translational continuity from prior animal work to clinical application.
- Imaging-based assessment to document perfusion changes.
Limitations
- Small, retrospective, single-arm series without controls.
- Heterogeneity in timing, dosing, and routes of nitroglycerin/heparin administration not standardized.
Future Directions: Develop standardized protocols (dose, timing, route) and validate in multicenter prospective registries or controlled trials; explore adjuncts (e.g., hyperbaric oxygen) and tissue outcomes.
BACKGROUND: The use of PCL fillers has increased due to their long-lasting effects and collagen stimulation properties. However, managing vascular embolisms caused by PCL fillers is challenging due to the inability to dissolve them quickly. This study builds upon our previous findings from animal studies, which provided valuable insights into the management of PCL-related vascular complications. OBJECTIVES: To evaluate the efficacy of heparin and nitroglycerin in managing vascular embolism complications resulting from PCL fillers in a clinical setting. METHODS: A retrospective clinical study involves 10 patients with vascular embolisms following PCL injections. Treatments included heparin and nitroglycerin administration, imaging for embolism assessment and follow-up ranging from 1 month to 1 year. RESULTS: The study demonstrated a significant improvement in blood flow and reduction in ischemia with minimal adverse reactions. CONCLUSIONS: Heparin and nitroglycerin are effective in managing PCL-related vascular embolisms, providing a viable alternative for clinicians. LEVEL OF EVIDENCE III: This journal requires that authors assign a level of evidence to each article. For a full description of these Evidence-Based Medicine ratings, please refer to the Table of Contents or the online Instructions to Authors www.springer.com/00266 .