title: Atrial natriuretic peptide and red cell 2,3-diphosphoglycerate in patients with chronic mountain sickness.
abstract: BACKGROUND
  Individuals with chronic mountain sickness (CMS) show severe hypoxemia, excessive polycythemia, and marked pulmonary hypertension. The pathophysiologic mechanisms of CMS are still not completely understood.
  
  
  METHODS
  We determined plasma atrial natriuretic peptide (ANP), red cell 2,3-diphosphoglycerate (2,3-DPG), hematocrit, hemoglobin, and arterialized ear lobe blood gas values in 13 patients with CMS (9 Hans, 4 Tibetans) and 18 control Han Chinese men of similar age, height, and weight who had been living at 4300 m on the Tibetan plateau of Qinghai Province, China, for approximately 14 years.
  
  
  RESULTS
  A significantly higher level of ANP was found in the CMS patients compared to the non-CMS patients (113.4+/-5.5 pg/mL vs 87.6+/-4.7 pg/mL, P < .01), and the levels of ANP correlated positively with the hemoglobin concentration (r = 0.8282, P < .01). The 2,3-DPG levels in the CMS patients were significantly increased compared to the non-CMS subjects (5.23+/-0.16 mmol/L vs 4.40+/-0.12 mmol/L, P < .01), and the 2,3-DPG concentrations in the CMS patients were negatively correlated with their PaO2 values (r = -0.7898, P < .01). The CMS patients had significantly higher PaCO2 levels, lower pH values, lower PaO2 levels, and greater alveolar-arterial oxygen differences (PAO2 - PaO2) compared to the non-CMS subjects.
  
  
  CONCLUSIONS
  These findings suggest that overproduction of ANP and 2,3-DPG at high altitudes may play an important role in the pathophysiology of chronic mountain sickness.
authors: Qinghai High Altitude Medical Science Institute, Xinging, Qinghai, China.
authors: R L
authors: RL
authors: Ge
authors: H R
authors: HR
authors: Shai
authors: M
authors: M
authors: Takeoka
authors: M
authors: M
authors: Hanaoka
authors: T
authors: T
authors: Koizumi
authors: Y
authors: Y
authors: Matsuzawa
authors: K
authors: K
authors: Kubo
authors: T
authors: T
authors: Kobayashi
mesh_terms: D019794:2,3-Diphosphoglycerate / Q000378:metabolism*; D000328:Adult; D000532:Altitude Sickness / Q000097:blood / Q000503:physiopathology*; D009320:Atrial Natriuretic Factor / Q000378:metabolism*; D001784:Blood Gas Analysis; D016022:Case-Control Studies; D002908:Chronic Disease; D004912:Erythrocytes / Q000378:metabolism; D006801:Humans; D008297:Male; D012129:Respiratory Function Tests
chemical_list: D019794:2,3-Diphosphoglycerate; D009320:Atrial Natriuretic Factor