MEASUREMENTS OF MORNINGS AND EVENING AIR-FLOW GROSSLY UNDERESTIMATE THE CIRCADIAN VARIABILITY OF FEV(1) AND PEAK EXPIRATORY FLOW-RATE IN ASTHMA

被引:37
作者
DALONZO, GE [1 ]
STEINIJANS, VW [1 ]
KELLER, A [1 ]
机构
[1] BYK GULDEN LOMBERG GMBH,W-7750 CONSTANCE,GERMANY
关键词
D O I
10.1164/ajrccm.152.3.7663789
中图分类号
R4 [临床医学];
学科分类号
1002 ; 100602 ;
摘要
Peak expiratory flow rate (PEF) or forced expiratory volume in 1 s (FEV(1)) monitoring is an important clinical tool to assess the degree of 24-h variation (circadian) in lung function, which correlates with the degree of airway hyperresponsiveness. Ideally, PEF measurements should be taken frequently during the 24-h period to reflect the true variability. In practice, however, measurements are generally taken twice daily, usually upon arising and in the evening before bedtime. The effect of reducing the frequency of lung function measurement on the reported 24-h time average (mesor) and the circadian variability were evaluated. Four measurements taken 8 h apart and two measurements derived upon arising and the other, either 12 h later or before retiring, were compared with the full 24-h lung function profile, which included thirteen 2-hourly measurements. Based on the data from a 24-h lu ng function study in 20 adult patients with asthma, the corresponding values were separately compared at baseline and under two theophylline treatments, one being administered twice daily and the other once daily. The results are as follows: Whereas the 24-h time average (mesor) is hardly effected by the reduced measurements schemes, variability was grossly underestimated. Only 60 to 80% of the actual variability is picked up in the case of the four 8-hourly measurements, and only 20 to 45% in the case of the two measurements. The loss of accuracy in assessing 24-h airflow variability has potentially important implications on clinical practice and the investigation of therapeutics in asthma. In conclusion, it would be ideal to be able to perform airflow measurements every 2 h around the dock, but this is clinically impractical. While the error in assessing circadian airflow variability is unacceptably high in taking only two measurements, it is reduced to acceptable levels by taking four measurements a day.
引用
收藏
页码:1097 / 1099
页数:3
相关论文
共 17 条
  • [1] ARKINSTALL WW, 1987, AM REV RESPIR DIS, V135, P316
  • [2] NOCTURNAL ASTHMA AND CHANGES IN CIRCULATING EPINEPHRINE, HISTAMINE, AND CORTISOL
    BARNES, P
    FITZGERALD, G
    BROWN, M
    DOLLERY, C
    [J]. NEW ENGLAND JOURNAL OF MEDICINE, 1980, 303 (05) : 263 - 267
  • [3] BARNES PJ, 1982, LANCET, V1, P299
  • [4] INTERPRETATION OF BRONCHODILATOR RESPONSE IN PATIENTS WITH OBSTRUCTIVE AIRWAYS DISEASE
    BRAND, PLP
    QUANJER, PH
    POSTMA, DS
    KERSTJENS, HAM
    KOETER, GH
    DEKHUIJZEN, PNR
    SLUITER, HJ
    [J]. THORAX, 1992, 47 (06) : 429 - 436
  • [5] 24 HOUR LUNG-FUNCTION IN ADULT PATIENTS WITH ASTHMA - CHRONOPTIMIZED THEOPHYLLINE THERAPY ONCE-DAILY DOSING IN THE EVENING VERSUS CONVENTIONAL TWICE-DAILY DOSING
    DALONZO, GE
    SMOLENSKY, MH
    FELDMAN, S
    GIANOTTI, LA
    EMERSON, MB
    STAUDINGER, H
    STEINIJANS, VW
    [J]. AMERICAN REVIEW OF RESPIRATORY DISEASE, 1990, 142 (01): : 84 - 90
  • [6] PHYSIOLOGICAL MEASURES - PULMONARY-FUNCTION TESTS - ASTHMA OUTCOME
    ENRIGHT, PL
    LEBOWITZ, MD
    COCKROFT, DW
    [J]. AMERICAN JOURNAL OF RESPIRATORY AND CRITICAL CARE MEDICINE, 1994, 149 (02) : S9 - S18
  • [7] MULTICENTER COMPARISON OF ONCE-DAILY UNIPHYL TABLETS ADMINISTERED IN THE MORNING OR EVENING WITH BASELINE TWICE-DAILY THEOPHYLLINE THERAPY IN PATIENTS WITH NOCTURNAL ASTHMA
    GROSSMAN, J
    [J]. AMERICAN JOURNAL OF MEDICINE, 1988, 85 (1B) : 11 - 13
  • [8] CIRCADIAN VARIATIONS IN THEOPHYLLINE CONCENTRATIONS AND THE TREATMENT OF NOCTURNAL ASTHMA
    MARTIN, RJ
    CICUTTO, LC
    BALLARD, RD
    GOLDENHEIM, PD
    CHERNIACK, RM
    [J]. AMERICAN REVIEW OF RESPIRATORY DISEASE, 1989, 139 (02): : 475 - 478
  • [9] NEUENKIRCHEN H, 1985, EUR J RESPIR DIS, V66, P196
  • [10] SAFETY AND EFFICACY OF ONCE-DAILY UNIPHYL TABLETS COMPARED WITH TWICE-DAILY THEO-DUR TABLETS IN ELDERLY PATIENTS WITH CHRONIC AIR-FLOW OBSTRUCTION
    RIVINGTON, RN
    CALCUTT, L
    HODDER, RV
    STEWART, JH
    AITKEN, TL
    [J]. AMERICAN JOURNAL OF MEDICINE, 1988, 85 (1B) : 48 - 53