title: Gamma-glutamyl transferase and airflow obstruction in middle-aged men.
abstract: BACKGROUND
  A relationship between pulmonary dysfunction and cardiovascular mortality has been described. The mechanism responsible for the relationship remains largely unknown.
  
  
  METHODS
  The association between airflow obstruction and selected cardiovascular risk factors including gamma-glutamyl transferase (gamma-GT) and total homocysteine was analyzed cross-sectionally in 954 middle-aged men. Airflow obstruction was assessed with %FEV(1) (FEV(1)/FVC).
  
  
  RESULTS
  Serum gamma-GT and white blood cell (WBC) count were higher in subjects with airflow obstruction (%FEV(1)<70%) than in those without it (76.9+/-164.3 IU/L vs. 55.9+/-67.9 IU/L, P=0.030; 6290+/-1590/microL vs. 5590+/-1410/microL, P<0.001). Airflow obstruction was not associated with body mass index, total cholesterol, triglycerides, fasting glucose, or systolic blood pressure, but there was a marginal association with total homocysteine. In a logistic regression analysis adjusted for smoking status and alcohol consumption, the odds ratios (95% confidence interval) of Delta100 IU/L increase in gamma-GT and Delta1000/microL increase in WBC count for the presence of airflow obstruction were 1.20 (0.97-1.48, P=0.090) and 1.21 (1.02-1.44, P=0.036), respectively.
  
  
  CONCLUSIONS
  Airflow obstruction was associated with gamma-GT. The association was independent of alcohol consumption category, but was attenuated by the addition of cigarette smoking status.
authors.affiliation: Department of Internal Medicine, Self-Defense Forces Central Hospital, 1-2-24 Ikejiri, Setagaya-ku, Tokyo 154-8532, Japan.
authors.forename: Hidenari
authors.initials: H
authors.lastname: Sakuta
authors.forename: Takashi
authors.initials: T
authors.lastname: Suzuki
authors.forename: Hiroko
authors.initials: H
authors.lastname: Yasuda
authors.forename: Teizo
authors.initials: T
authors.lastname: Ito