title: Radiofrequency vs laser in the management of mild to moderate obstructive sleep apnoea: does the number of treatment sessions matter?
abstract: OBJECTIVE
  Obstructive sleep apnea (OSA) is a relatively common and serious problem with many medical and social consequences. Laser and radiofrequency are two recent techniques used to treat OSA and they can be carried out under local anaesthesia, but they need multiple sessions to achieve satisfactory outcome and are associated with better short-term than long-term outcomes. In this work we compare the two modalities as regards the optimal number of treatment sessions needed to achieve a favourable outcome in the short and long term.
  
  
  METHODS
  A total of 150 patients with apnoea hypopnoea index (AHI) between 5 and 30 events per hour, no morbid obesity and retropalatal site of obstruction were included in this prospective study.
  
  
  METHODS
  Patients were randomly and equally divided into two groups, each comprising 75 patients. The first group was treated with bipolar radiofrequency volumetric tissue reduction of the palate (BRVTR) and the second group was treated with laser-assisted uvulopalatoplasty (LAUP). Each group was further subdivided into five subgroups each consisting of 15 patients. The first group received one treatment session, the second received two sessions, the third received three sessions, the fourth received four sessions and the fifth group received five treatment sessions. Evaluation of efficiency of both techniques in treating OSA was assessed objectively by polysomnography.
  
  
  RESULTS
  In those treated with BRVTR; at least three sessions were needed to achieve a favourable outcome in OSA in the short and long term. In those treated with LAUP, a single treatment session was enough to achieve a favourable outcome on OSA in the short term, while two sessions were needed to achieve the same long-term outcome.
  
  
  CONCLUSIONS
  In OSA, fewer treatment sessions are needed with LAUP (one session) than with BRVTR (three sessions) to achieve a favourable outcome. In LAUP more treatment sessions (two) are needed to maintain a longer-term favourable outcome than those needed to achieve short-term favourable outcome (one session), which is not the case with BRVTR (three sessions are needed to achieve both short- and long-term favourable results).
authors.affiliation: Department of Otolaryngology, Faculty of Medicine, Cairo University, Egypt. amaratef@dr.com
authors.forename: Ahmed
authors.initials: A
authors.lastname: Atef
authors.forename: Mohammed
authors.initials: M
authors.lastname: Mosleh
authors.forename: Mohammed
authors.initials: M
authors.lastname: Hesham
authors.forename: Ahmed
authors.initials: A
authors.lastname: Fathi
authors.forename: Mohammed
authors.initials: M
authors.lastname: Hassan
authors.forename: Mahmoud
authors.initials: M
authors.lastname: Fawzy
mesh_terms: D000328:Adult; D000772:Anesthesia, Local; D017115:Catheter Ablation / Q000379:methods*; D006801:Humans; D053685:Laser Therapy / Q000379:methods*; D008875:Middle Aged; D010160:Palate, Soft / Q000601:surgery; D017286:Polysomnography; D011446:Prospective Studies; D020181:Sleep Apnea, Obstructive / Q000601:surgery*; D016896:Treatment Outcome; D014609:Uvula / Q000601:surgery