Continuous Levalbuterol for Treatment of Status Asthmaticus in Children
This study will use a randomized, double-blind, controlled trial design in order to assess the safety and efficacy of levalbuterol (LEV) compared to racemic albuterol (RAC) when delivered continuously in a high-dose regimen for children with severe exacerbations of asthma.
- Children with severe asthma receiving continuous levalbuterol will have a shorter duration of continuous therapy as compared to racemic albuterol.
- Children receiving continuous levalbuterol will have improved lung function measured by forced expiratory volume at 1 second (FEV1) as compared to racemic albuterol.
- Children receiving continuous levalbuterol will have improved clinical asthma score as compared to racemic albuterol.
|Asthma||Drug: Racemic albuterol (R+S albuterol) Drug: Levalbuterol (R albuterol)||Phase 4|
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
|Official Title:||Continuous Levalbuterol for Treatment of Status Asthmaticus in Children|
- Duration of Continuous Therapy [ Time Frame: During hospitalization ]standard intention to treat (ITT) analysis
- Change in Pediatric Asthma Severity Score [ Time Frame: After 12 hours of continuous nebulization ]
Change in Pediatric Asthma Severity Score. Range 0 (best) - 6 (worst)
Score at each time point is calculated by adding 3 elements:
Wheeze (0= None/Mild, 1=Moderate, 2=Severe) Prolonged expiration (0= None/Mild, 1=Moderate, 2=Severe) Work of breathing (0= None/Mild, 1=Moderate, 2=Severe)
- Heart Rate [ Time Frame: After 12 hours of continuous nebulization ]
- Serum Potassium Levels [ Time Frame: After 12 hours of continuous nebulization ]
- Serum Albuterol S Isomer Levels [ Time Frame: After 6 hours of continuous albuterol ]
|Study Start Date:||April 2004|
|Study Completion Date:||February 2006|
|Primary Completion Date:||February 2006 (Final data collection date for primary outcome measure)|
Nebulized levalbuterol 10mg/hr given continuously
Drug: Levalbuterol (R albuterol)
10mg/hr continuous nebulized levalbuterol
Other Name: Xopenex
Active Comparator: 2
Racemic albuterol 20mg/hr given continuously
Drug: Racemic albuterol (R+S albuterol)
20mg/hr continuous racemic albuterol
High-dose nebulized albuterol is standard therapy for severe asthma exacerbations at The Children's Hospital of Philadelphia (CHOP) and other tertiary care pediatric hospitals throughout the United States. For the most severe exacerbations, albuterol is provided continuously at high doses until improvement is observed. This regimen has been standardized in a treatment protocol that has been used at CHOP for more than 5 years. Recently, levalbuterol (LEV), the purified active (R)-enantiomer of albuterol, has been approved for use in acute asthma. Preliminary evidence suggests that LEV may improve pulmonary function and clinical outcomes in children with asthma based on studies using standard dosing regimens. Laboratory and clinical evidence suggest that the (S)-enantiomer of albuterol may have detrimental effects that contribute to poor response to racemic albuterol (RAC). Limited data exist about the efficacy of LEV in high-dose regimens.
This study will use a randomized, double-blind, controlled trial design in order to assess the safety and efficacy of LEV compared to RAC when delivered continuously in a high-dose regimen for severe exacerbations of asthma. Children treated for asthma exacerbations in the CHOP emergency department (ED) will be eligible for study enrollment. Those that meet enrollment criteria will be randomized to receive either high dose RAC according to the standard asthma care protocol or equivalent dosing of LEV. Approximately 128 patients with 64 in each arm of the study will be enrolled. An interim safety analysis will be conducted after the first 40 patients are enrolled. This study should be completed in six to nine months. The primary outcome will be duration of continuous therapy. Secondary outcomes will include improvement of clinical asthma score and change in forced expiratory volume in one second (FEV1). In addition, (R)-albuterol and (S)-albuterol levels will be measured at study entry and at 6-hour intervals in the first 40 patients enrolled. These values will be used to determine prior RAC exposure and to determine serum levels of (R) and (S) albuterol during continuous therapy.
Please refer to this study by its ClinicalTrials.gov identifier: NCT00124176
|United States, Pennsylvania|
|The Children's Hospital of Philadelphia|
|Philadelphia, Pennsylvania, United States, 19104|
|Principal Investigator:||Joseph J Zorc, MD||Children's Hospital of Philadelphia|