title: The relationship between baseline exhaled nitric oxide levels and acute mountain sickness.
abstract: BACKGROUND
  Acute mountain sickness (AMS) is a common disabling condition observed in people ascending to high altitudes. However, a simple predictive test for AMS is not known. The aim of this study was to assess the relationship between baseline exhaled nitric oxide (FENO) and AMS occurrence.
  
  
  METHODS
  Eighty healthy lowland Chinese adults were recruited for this study. FENO was measured at baseline, as well as 6 and 24 hours after arrival in Tibet. The standard Lake Louise Score (LLS) consensus symptoms questionnaire was used to assess the incidence and severity of AMS.
  
  
  RESULTS
  Individuals with a high LLS (> 3) had higher FENO levels at baseline and after arrival in Tibet than people with a low LLS (≤ 3) (baseline: 22.9 ± 11.9 versus 16.7 ± 6.4; 6 hours: 26.2 ± 16.7 versus 17.9 ± 5.7; 24 hours: 24.9 ± 13.1 versus 16.3 ± 1.7; all P < 0.01). Evaluation of risk factors revealed that female gender, diabetes and not smoking were associated with a high AMS score (all P < 0.05), but that hypertension showed no association (P > 0.05).
  
  
  CONCLUSIONS
  This prospective observational study suggests that baseline FENO levels may be positively correlated with AMS in healthy Chinese lowlanders.
authors.affiliation: Departments of Emergency (X-WR, C-YM, L-C, TS-L), and Geriatric Cardiology (HW, PY), The PLA General Hospital, Beijing, China; Department of Cardiology (HH), Beijing Shi Jing Shan Hospital, Beijing, China; Department of Cardiology (H-YQ), 335 Hospital, Jingdezhen, China; and Department of Cardiology (GZ), Air Force General Hospital, PLA, Beijing, China; Department of research and education of Hui people hospital Beijing (Q-YZ).
authors.forename: Xue-Wen
authors.initials: XW
authors.lastname: Ren
authors.forename: Qiu-ying
authors.initials: QY
authors.lastname: Zhang
authors.forename: Hao
authors.initials: H
authors.lastname: Wang
authors.forename: Heng
authors.initials: H
authors.lastname: Hong
authors.forename: Huai-Yu
authors.initials: HY
authors.lastname: Qiao
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Man
authors.forename: Gang
authors.initials: G
authors.lastname: Zhao
authors.forename: Li
authors.initials: L
authors.lastname: Chen
authors.forename: Tan-shi
authors.initials: TS
authors.lastname: Li
authors.forename: Ping
authors.initials: P
authors.lastname: Ye
mesh_terms: D000208:Acute Disease; D000328:Adult; D000367:Age Factors; D000532:Altitude Sickness / Q000378:metabolism*; D044466:Asian People; D015415:Biomarkers / Q000378:metabolism; D001944:Breath Tests; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009569:Nitric Oxide / Q000378:metabolism*; D012307:Risk Factors; D012737:Sex Factors
chemical_list: D015415:Biomarkers; D009569:Nitric Oxide