How fast does oral dexamethasone work in mild to moderately severe croup? A randomized double-blinded clinical trial

Area of Science:

• Pediatric Emergency Medicine
• Pharmacology
• Clinical Trials

Background:

• Controversy exists regarding optimal dexamethasone dosage and onset of action for pediatric croup.
• Previous reviews suggested higher doses (0.6 mg/kg) with expected benefit after 4-6 hours.

Purpose of the Study:

• To evaluate the efficacy of a lower dose (0.15 mg/kg) of oral dexamethasone in treating pediatric croup.
• To determine if this lower dose provides therapeutic benefit within 30 minutes.

Main Methods:

• A randomized, double-blinded clinical trial involving children aged over 6 months with mild to moderate croup (Westley score 1-6).
• Participants received either 0.15 mg/kg dexamethasone or placebo.
• Croup scores and vital signs were monitored every 10 minutes for up to 1 hour.

Main Results:

• A statistically significant reduction in croup scores was observed in the dexamethasone group by 30 minutes post-administration.
• A trend towards lower croup scores was evident from 10 minutes in the dexamethasone group.
• Baseline characteristics were comparable between groups, except for a higher respiratory rate in the placebo group.

Conclusions:

• Oral dexamethasone at 0.15 mg/kg offers rapid therapeutic benefit for pediatric croup, with effects seen by 30 minutes.
• This early onset of action contrasts with the previously suggested 4-hour timeframe.
• The findings may support earlier and broader treatment of croup, potentially reducing parental and physician concerns about delayed benefits.