title: Split-face comparison of ultrapulse-mode and superpulse-mode fractionated carbon dioxide lasers on photoaged skin.
abstract: BACKGROUND
  Both ultrapulse-mode and superpulse-mode fractional CO2 lasers (UPCO2 and SPCO2) could be successfully used in treating photoaged skin.
  
  
  OBJECTIVE
  This evidence-based study was intended to compare the therapeutic and adverse effects of UPCO2 and SPCO2 in treating photoaged skin in Chinese subjects.
  
  
  METHODS
  Eighteen Chinese subjects with Fitzpatrick skin type IV were enrolled in a randomized, split-face trial. Subjects received SPCO2 on one half of the face and UPCO2 on the other half. Before and after photos, skin color, epidermal water content, sebum level, periorbital wrinkles, skin roughness, and self-esteem questionnaires were used.
  
  
  RESULTS
  Global evaluation and subjects' self-esteem assessments showed a similar trend at 1-month and 3-month follow-up visits on both sides. The UPCO2 laser has a shorter downtime of 6.25±2.71 days compared with 6.41±2.67 days for SPCO2, but has a higher incidence of edema, spot bleeding, prolonged redness and postinflammatory hyperpigmentation. More subjects prefer SPCO2 treatment because of similar efficacy and fewer adverse effects.
  
  
  CONCLUSIONS
  The effectiveness of the SPCO2 laser in treating photoaged skin is very similar to the UPCO2 laser, with less erythema, but more crusting and longer downtime.
authors.affiliation: Department of Dermatology, No 1 Hospital of China Medical University, Shenyang, Liaoning, China.
authors.forename: Yao-Jia
authors.initials: YJ
authors.lastname: Luo
authors.forename: Xue-Gang
authors.initials: XG
authors.lastname: Xu
authors.forename: Yan
authors.initials: Y
authors.lastname: Wu
authors.forename: Tian-Hua
authors.initials: TH
authors.lastname: Xu
authors.forename: John Z S
authors.initials: JZ
authors.lastname: Chen
authors.forename: Xing-Hua
authors.initials: XH
authors.lastname: Gao
authors.forename: Hong-Duo
authors.initials: HD
authors.lastname: Chen
authors.forename: Yuan-Hong
authors.initials: YH
authors.lastname: Li
mesh_terms: D000328:Adult; D044466:Asian People; D002681:China; D003357:Cosmetic Techniques; D004487:Edema / Q000453:epidemiology / Q000209:etiology; D019317:Evidence-Based Medicine; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D017495:Hyperpigmentation / Q000453:epidemiology / Q000209:etiology; D054020:Lasers, Gas / Q000009:adverse effects / Q000627:therapeutic use*; D008875:Middle Aged; D057240:Patient Preference; D012060:Rejuvenation; D012649:Self Concept; D016037:Single-Blind Method; D015595:Skin Aging; D012880:Skin Pigmentation; D011795:Surveys and Questionnaires; D013997:Time Factors; D016896:Treatment Outcome