title: [Standard values and normal limits for arterial blood gases in healthy elderly Japanese subjects].
abstract: We studied the standard values and normal limits for arterial blood gases in healthy elderly Japanese subjects. The criteria for inclusion were; 1) older than 60 years and able to walk independently, 2) non-smoker, 3) no respiratory symptoms, 4) no thoracic deformity, 5) no clinical signs of chest disease, 6) no abnormal findings in chest X ray, and 7) no cardiac disease or obesity. The number of subjects was 78. The oldest subject was a 96-year-old female. Arterial punctures were performed with the subjects in a recumbent position. PaO2 ranged from 79 to 106 Torr, with a mean value of 89.8 Torr. PaCO2 ranged from 32 to 48 Torr with a mean value of 39.6 Torr. Maximum values of alveolar-arterial O2 tension difference and arterial-alveolar N2 tension difference were 20.2 Torr and 11.6 Torr, respectively. The regression equation for PaO2 with respect to age was; PaO2 = 99.32-0.126 x (age), and its residual standard deviation was 6.06 Torr. These values were not different from those obtained in healthy young Japanese subjects.
authors.affiliation: Department of Medicine, School of Medicine, Keio University.
authors.forename: F
authors.initials: F
authors.lastname: Yamasawa
authors.forename: T
authors.initials: T
authors.lastname: Kawashiro
authors.forename: T
authors.initials: T
authors.lastname: Yokoyama
authors.forename: N
authors.initials: N
authors.lastname: Ohtsuka
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D002245:Carbon Dioxide / Q000097:blood*; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008875:Middle Aged; D010100:Oxygen / Q000097:blood*; D010313:Partial Pressure; D012015:Reference Standards; D012016:Reference Values
chemical_list: D002245:Carbon Dioxide; D010100:Oxygen