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Clinical Trial
Journal Article
Research Support, Non-U.S. Gov't
The effect of inhaled adrenaline on lung function of recurrently wheezy infants less than 18 months old.
Pediatric Pulmonology 1995 July
Inhaled bronchodilators have been shown not to improve lung function in infants with wheeze. This observation has led to the suggestion that airway wall edema may be more important than bronchoconstriction in infants with airway narrowing. Inhaled adrenaline is used to relieve upper airway edema in children with croup and has been demonstrated to improve clinical scores and lower pulmonary resistance in some infants with wheeze associated with bronchiolitis. The aim of the present study was to examine the effect of inhaled adrenaline on lung function in a group of infants with recurrent wheeze. Eleven infants aged 10 to 18 months with a history of recurrent wheeze were studied during an asymptomatic interval. Respiratory function was assessed (1) by measuring maximal expiratory flow at functional residual capacity (VmaxFRC) during a forced partial expiratory maneuver and (2) by measuring conductance of the respiratory system (Grs) using a single expiratory occlusion technique. Following baseline measurements, the infants received 0.5 mg/kg adrenaline by nebulizer and serial lung function tests were repeated at 5 min intervals. Ten infants had abnormal baseline lung function (median VmaxFRC 44.2% predicted; median Grs 34% predicted). Using a random effects model, VmaxFRC and Grs declined significantly at 10 and 5 min after adrenaline, respectively. No significant improvements from baseline were observed in either measurement for up to 30 min following adrenaline delivery. It is concluded that inhaled adrenaline did not relieve airways obstruction in this group of asymptomatic infants with recurrent wheeze.
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