Laser Resurfacing

Laser Resurfacing - Basics & Beams

• Principle: Selective photothermolysis; laser light absorbed by target chromophore (water in skin).
• Mechanism: Converts light to thermal energy, causing controlled tissue ablation or coagulation.
• Ablative Lasers: Vaporize tissue.
  • CO₂ Laser: 10,600 nm; deep penetration, significant thermal injury & collagen remodeling.
  • Er:YAG Laser: 2940 nm; superficial ablation, less thermal damage, faster healing.
• Fractional Lasers: Create microscopic treatment zones (MTZs), sparing surrounding tissue.

⭐ The depth of penetration of a laser is directly proportional to its wavelength; longer wavelengths like CO₂ penetrate deeper than shorter wavelengths like Er:YAG.

Laser Resurfacing - Laser Lineup

• Ablative Lasers: Vaporize tissue; significant downtime.
  • CO₂ (10,600 nm): Water chromophore. Deep penetration for severe wrinkles, acne scars. High efficacy, longer recovery.
  • Er:YAG (2940 nm): Water chromophore (higher affinity). Superficial ablation for fine lines. Less thermal damage, quicker healing.
• Fractional Lasers: Microscopic Treatment Zones (MTZs).
  • Ablative Fractional (CO₂, Er:YAG): Deeper injury, faster recovery than traditional ablative. For moderate wrinkles, scars.
  • Non-Ablative Fractional (e.g., 1550 nm Er:Glass, 1927 nm Thulium): Water chromophore. Dermal heating, collagen remodeling. Mild wrinkles, texture; minimal downtime.

⭐ Fractional lasers create columns of thermal injury (MTZs) surrounded by untreated skin, allowing for faster re-epithelialization and reduced side effects compared to fully ablative lasers.

Laser Resurfacing - Patient Profile

• Ideal Candidates: Fitzpatrick skin types I-III; addressing fine lines, wrinkles, acne scars, photodamage. Realistic expectations crucial.
• Key Considerations/Contraindications:
  • Darker skin (Fitzpatrick IV-VI): ↑ Post-Inflammatory Hyperpigmentation (PIH) risk.
  • Active skin infections (e.g., Herpes Simplex Virus).
  • History of keloid or hypertrophic scarring.
  • Recent isotretinoin use (within 6-12 months).
  • Unrealistic expectations.

⭐ Patients with a history of herpes simplex virus (HSV) require prophylactic antiviral therapy before perioral laser resurfacing to prevent reactivation.

Laser Resurfacing - Procedure Pointers

• Pre-Procedure:
  • Patient selection (Fitzpatrick I-III ideal for ablative).
  • Stop smoking, aspirin/NSAIDs.
  • Prophylaxis: Antiviral (e.g., Acyclovir) for perioral; consider antibiotics.
  • Skin priming: Topical retinoids, hydroquinone (4-6 wks) to ↓ PIH risk.
  • Anesthesia: Topical, local blocks, tumescent, or general.
• Procedure:
  • Mandatory eye protection (patient & staff).
  • Technique: Adjust fluence, pulse duration, density. Overlap passes by 10-30%.
  • Cooling: Zimmer/cryogen spray.
  • Endpoint: Tissue color change (e.g., chamois for CO2, pink for Erbium).
• Post-Procedure:
  • Cooling, occlusive dressings (e.g., Flexan), emollients.
  • Gentle cleansing (e.g., dilute vinegar soaks), antibiotic ointment.
  • Strict sun protection (broad-spectrum SPF 30+).
  • Monitor: Infection, PIH, scarring. Prolonged erythema is common.

⭐ Prophylactic antivirals (e.g., valacyclovir 500mg BID) are crucial for patients with a history of herpes simplex, starting 1-2 days pre-op and continuing for 7-10 days post-op, especially for perioral resurfacing.

Laser Resurfacing - Complication Control

• Infection Prevention & Management:
  • Viral (HSV): Prophylactic antivirals (e.g., valacyclovir 500mg BID) especially for perioral areas.
  • Bacterial: Consider prophylactic antibiotics; treat active infections.
• Pigmentary Alterations:
  • Hyperpigmentation: Sun protection, bleaching agents (hydroquinone). More common in skin types IV-VI.
  • Hypopigmentation: Difficult; avoid over-treatment.
• Scarring: Rare; manage with intralesional steroids, silicone sheets.
• Prolonged Erythema: Topical corticosteroids, cooling measures.

⭐ Herpes simplex virus reactivation is a significant concern; antiviral prophylaxis is key for at-risk patients undergoing perioral laser resurfacing to prevent outbreaks and potential scarring.

High‑Yield Points - ⚡ Biggest Takeaways

• Ablative lasers (CO2, Er:YAG) vaporize tissue; Non-ablative stimulate dermal collagen.
• CO2 laser: Gold standard for deep wrinkles & scars; higher PIH risk.
• Er:YAG laser: Superficial ablation, faster healing, less thermal damage.
• Fractional lasers create MTZs (microscopic treatment zones) for rapid healing, reduced side effects.
• Key uses: Wrinkles, acne scars, photoaging, dyschromia.
• PIH (Post-Inflammatory Hyperpigmentation) is a major risk, especially in darker skin types (Fitzpatrick IV-VI).
• Avoid with active infections, recent isotretinoin use, keloidal tendency.