title: Inhaled steroids for episodic viral wheeze of childhood.
abstract: BACKGROUND
  Recurrent episodic wheeze in association with viral upper respiratory tract infection (URTI) is a specific clinical illness distinct from persistent atopic asthma.
  
  
  OBJECTIVE
  The objective of this review was to identify whether corticosteroid treatment, given episodically or daily, is beneficial to children with viral episodic wheeze.
  
  
  METHODS
  We searched the Cochrane Airways Group trials register and reference lists of articles.
  
  
  METHODS
  Randomised controlled trials (RCTs) of corticosteroid treatment versus placebo in children under 17 years of age who suffer from 'episodic viral wheeze', which is defined by wheeze in association with coryzal symptoms with minimal or no intercurrent lower respiratory tract symptoms.
  
  
  METHODS
  Trial quality was assessed independently by two reviewers. Study authors were contacted for missing information. Studies were categorised according to whether treatment was given episodically or daily (maintenance). The primary outcome was episodes requiring oral corticosteroids. Secondary outcomes addressed episode severity, frequency and duration and parental treatment preference.
  
  
  RESULTS
  Five randomised controlled trials in children with a history of mild episodic viral wheeze were identified. Most of the children had previously required no or infrequent oral corticosteroids and had very infrequent hospital admissions. There were three studies of preschool children given episodic high dose inhaled corticosteroid (1.6 - 2.25 mg per day), two using a crossover and one a parallel design. The two studies of maintenance corticosteroid (400 micrograms per day) were parallel in design, one of pre-school children the other of children aged 7 -9 years. Results from the two cross-over studies of episodic high dose inhaled corticosteroids showed a reduced requirement for oral corticosteroids (Relative risk (RR)=0.53, 95% CI: 0.27, 1.04). In these 2 double blind studies, this treatment was preferred by the children's parents over placebo (RR=0.64, 95% CI: 0.48,0.87). Maintenance low dose inhaled corticosteroids did not show any clear reduction over placebo in the proportion of episodes requiring oral corticosteroids (N=2 trials, RR=0.82, 95%CI: 0.23,2.90) or in those requiring hospital admission (N=1 trial, RR=0.21, 95% CI: 0.01,4.11).
  
  
  CONCLUSIONS
  Episodic high dose inhaled corticosteroids provide a partially effective strategy for the treatment of mild episodic viral wheeze of childhood. There is no current evidence to favour maintenance low dose inhaled corticosteroids in the prevention and management of episodic mild viral induced wheeze.
authors.affiliation: Department of Child Health, University of Leicester, Robert Kilpatrick Clinical Sciences Building, Royal Infirmary P.O. Box 65, Leicester, UK, LE2 7LX. mcm5@leicester.ac.uk
authors.forename: M
authors.initials: M
authors.lastname: McKean
authors.forename: F
authors.initials: F
authors.lastname: Ducharme
mesh_terms: D000280:Administration, Inhalation; D000293:Adolescent; D000305:Adrenal Cortex Hormones / Q000008:administration & dosage / Q000627:therapeutic use*; D001249:Asthma / Q000188:drug therapy*; D002648:Child; D002675:Child, Preschool; D006801:Humans; D012141:Respiratory Tract Infections / Q000188:drug therapy*; D014777:Virus Diseases / Q000188:drug therapy*
chemical_list: D000305:Adrenal Cortex Hormones