Maximum expiratory flow rates in induced bronchoconstriction in man

Peak expiratory flow rates in Libyan adolescents.

Peak expiratory flow rates of 578 Libyan boys and 527 Libyan girls aged 12 to 21 years were determined. The prediction formulae that best describe the data are as follows: Boys: PEFR = 160 X Stature 1.87 Girls: PEFR = 130 X Stature2.44 Statistically significant correlations were found between peak expiratory flow rate (PEFR) and standing height, sitting height, body mass index, body surface are...

Analysis of tidal expiratory flow pattern in the assessment of histamine-induced bronchoconstriction.

BACKGROUND There are times in clinical practice when it would be useful to be able to assess the severity of airways obstruction from tidal breathing. Three indices of airways obstruction derived from analysis of resting tidal expiratory flow have previously been described: (1) Tme/TE = time to reach maximum expiratory flow/expiratory time; (2) Krs = decay constant of exponential fitted to tida...

Peak expiratory flow rates in elderly Indians.

Peak expiratory flow rates were measured in 124 normal elderly men (55-85 yr) using the Wright's peak flow meter. In the less than 60 yrs age group (n = 32; mean age 57.7 yr) the PEFR was 431 +/- 13 lpm, while for the group greater than 60 yr (mean age 69.0 +/- 6.0; n = 92), the PEFR value was 373 +/- 11 1pm. These values are similar to those reported in other Indian studies, suggesting that th...

Histamine induced bronchoconstriction and end tidal inspiratory activity in man.

BACKGROUND End tidal inspiratory activity (ETIA) in diaphragm and parasternal intercostal muscles can be evoked in man and in animals by administration of histamine. Exacerbations of asthma and administration of histamine are often accompanied by hyperinflation. The aims of the study were to determine (1) the magnitude of ETIA in response to histamine in man, (2) the relative contributions of c...

Relationships between the Maximum Voluntary Ventilation and Various Expiratory Flow Rates.