TRANSIT-TIME INDEXES DERIVED FROM FORCED EXPIRATORY SPIROGRAMS - REPEATABILITY AND CRITERIA FOR CURVE SELECTION AND TRUNCATION

被引:1
作者
CHINN, DJ
COTES, JE
机构
[1] UNIV NEWCASTLE UPON TYNE, DEPT PHYSIOL SCI, RESP & EXERCISE LAB, NEWCASTLE UPON TYNE NE1 7RU, TYNE & WEAR, ENGLAND
[2] CITY HOSP EDINBURGH, EDINBURGH EH10 5SB, MIDLOTHIAN, SCOTLAND
基金
英国惠康基金;
关键词
FORCED EXPIRATION; MOMENTS ANALYSIS; REPEATABILITY; SPIROMETRY; STANDARDIZATION; TRANSIT TIMES;
D O I
10.1183/09031936.94.07020402
中图分类号
R56 [呼吸系及胸部疾病];
学科分类号
摘要
Transit time analysis applied to spirograms truncated with respect to volume, not time, could be informative in population surveys. The present paper asks the questions: How does averaging several forced expirations affect the within subject variability at different levels of truncation? If only one spirogram is analysed, how should it be chosen? Are the results likely to be influenced by prior bronchodilatation? The subjects were 46 men, selected by stratified random sampling from a ship yard population. Spirograms were obtained in quintuplicate, on two occasions, an average of nine days apart, Using the three ''best'' spirograms, transit time indices were calculated from averaged moments and from single carves selected in eight different ways; the analyses were performed on complete expirations, and after truncation by volume at levels between 75-99% of forced vital capacity (FVC), and by time (at 6 s). Indices from averaged moments were found to be more reproducible and yielded higher intra-class correlations than indices from single curves. Of the latter, the curve selected as having the largest forced vital capacity also yielded acceptable results. Prior inhalation of a bronchodilator aerosol did not reduce the variability. The averaging procedure is recommended for respiratory surveys of working men. For this application, the optimal level of truncation appeared to be by volume at 90% FVC, but on theoretical grounds truncation at 75 and 99% of FVC could also be informative.
引用
收藏
页码:402 / 408
页数:7
相关论文
共 18 条
[1]  
[Anonymous], 1987, AM REV RESPIR DIS, V136, P1285
[2]   STATISTICAL METHODS FOR ASSESSING AGREEMENT BETWEEN TWO METHODS OF CLINICAL MEASUREMENT [J].
BLAND, JM ;
ALTMAN, DG .
LANCET, 1986, 1 (8476) :307-310
[3]  
CHINN DJ, 1986, B EUR PHYSIOPATH RES, V22, P461
[4]   THE ASSESSMENT OF METHODS OF MEASUREMENT [J].
CHINN, S .
STATISTICS IN MEDICINE, 1990, 9 (04) :351-362
[5]  
Cotes JE, 1993, LUNG FUNCTION ASSESS
[6]   TRANSIT-TIME ANALYSIS OF THE FORCED EXPIRATORY SPIROGRAM DURING CLINICAL REMISSION IN JUVENILE ASTHMA [J].
LIANG, A ;
MACFIE, AE ;
HARRIS, EA ;
WHITLOCK, RML .
THORAX, 1979, 34 (02) :194-199
[7]   TRANSIT-TIME ANALYSIS OF THE FORCED SPIROGRAM IN HEALTHY CHILDREN AND ADULTS [J].
MACFIE, AE ;
HARRIS, EA ;
WHITLOCK, RML .
JOURNAL OF APPLIED PHYSIOLOGY, 1979, 46 (02) :263-267
[8]   DIGITAL INCREMENTAL TECHNIQUES APPLIED TO SPIROMETRY [J].
MCDERMOTT, M ;
MCDERMOTT, TJ .
PROCEEDINGS OF THE ROYAL SOCIETY OF MEDICINE-LONDON, 1977, 70 (03) :169-171
[9]  
MILLER MR, 1985, AM REV RESPIR DIS, V132, P1041
[10]   REPEATABILITY OF THE MOMENTS OF THE TRUNCATED FORCED EXPIRATORY SPIROGRAM [J].
MILLER, MR ;
PINCOCK, AC .
THORAX, 1982, 37 (03) :205-211