title: A double-blind, randomized, intra-individual controlled feasibility trial comparing the use of 1,470 and 940 nm diode laser for the treatment of hyperplastic inferior nasal turbinates.
abstract: BACKGROUND
  Various laser systems have been used for volume reduction of hyperplastic nasal turbinates. For endonasal application, fiber controlled diode lasers are preferred over conventional laser systems for reasons of cost and practicability. This study compares coagulative tissue effects using λ = 1,470 nm and λ = 940 nm lasers in treatment of hyperplastic inferior nasal turbinates in an intraindividual manner.
  
  
  METHODS
  Twenty patients underwent laser coagulation for hyperplastic inferior nasal turbinates in this prospective, randomized, double-blind, clinical feasibility trial. In each case, one nasal cavity was treated using 1,470 nm laser (4-5 W power), the other one with 940 nm laser (12 W power), endoscopically controlled in noncontact mode. Clinical presentation and patients symptoms were documented preoperatively and on day 1, 3, 7, 14, and 21 postoperatively using rhinomanometry, standardized questionnaires including SNOT 20 GAV (German adapted version), and separate endoscopic examination, respectively.
  
  
  RESULTS
  No infections, hemorrhages, or other complications occurred intra- or postoperatively. The mean operation time was significantly shorter using the 1,470 nm diode laser as compared to the 940 nm laser. There was a significant reduction of nasal obstruction on day 21 postoperatively compared to the preoperative condition on both sides regardless of the laser system used. Evaluation of the SNOT-Scores as assessed before and 3 weeks after surgery showed significant subjective improvements.
  
  
  CONCLUSIONS
  1,470 nm diode laser system offers an efficient method for tissue reduction in hyperplasia of inferior nasal turbinate. Compared with our standard practice (940 nm diode laser), 1,470 nm diode laser application provides an equivalent tissue reduction in shorter operation time using less total energy and a comparable relief of nasal obstruction postoperatively.
authors: Department of Otorhinolaryngology, Head & Neck Surgery, Ludwig Maximilian University, Munich, Germany. miriam.havel@med.uni-muenchen.de
authors: Miriam
authors: M
authors: Havel
authors: Ronald
authors: R
authors: Sroka
authors: Andreas
authors: A
authors: Leunig
authors: Parag
authors: P
authors: Patel
authors: Christian S
authors: CS
authors: Betz
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D004311:Double-Blind Method; D005240:Feasibility Studies; D005260:Female; D006801:Humans; D006965:Hyperplasia / Q000601:surgery; D017075:Laser Coagulation; D054023:Lasers, Semiconductor / Q000627:therapeutic use*; D008297:Male; D008875:Middle Aged; D011446:Prospective Studies; D014420:Turbinates / Q000473:pathology* / Q000601:surgery*; D055815:Young Adult