Lactobacillus Acidophilus L92 on Markers of Allergic Inflammation by Nasal Provocation With Grass Pollen
This is a placebo controlled double-blind single center study initiated and sponsored by CALPIS, Inc., Japan, and CALPIS U.S.A., Inc., Torrance, CA.
The overall objective of this study is to establish the benefit of a bacterial product, Lactobacillus acidophilus strain L-92 (CALPIS U.S.A., Inc., Torrance, CA), in patients with allergic rhinitis.
|Study Design:||Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Double Blind (Participant, Investigator)
Primary Purpose: Treatment
|Official Title:||A Randomized, Double-blind, Placebo-controlled Trial of Lactobacillus Acidophilus L92 on Markers of Allergic Inflammation by Nasal Provocation With Grass Pollen|
- The objective is to establish the benefit of Lactobacillus acidophilus strain L-92 in patients with allergic rhinitis. The threshold dose of pollen extract required to elicit nasal obstruction as measured by acoustic rhinometry pre-treatment. [ Time Frame: one year ]
- • The dose of pollen extract needed (by progressive dose escalation) to elicit nasal obstruction at the end of treatment if significant nasal obstruction is not reached with the pre-treatment dose. [ Time Frame: one year ]
|Study Start Date:||May 2006|
|Estimated Study Completion Date:||August 2008|
|Estimated Primary Completion Date:||December 2007 (Final data collection date for primary outcome measure)|
In the first phase, subjects with a history of grass pollinosis, with positive skin tests to grass, will be studied out of season and will be randomized to active treatment for 4 months.
Biological: Lactobacillus acidophilus L-92
Nasal challenge and acoustic rhinometry will be performed at the first study visit and again at the end of the 4-month supplement period. Standardized perennial ryegrass pollen extract (Lolium perenne) (Hollister-Stier, Inc., Spokane, WA) will be used. Dilutions of the standard product will be made in sterile saline prior to use. The standard product strength is 100,000 BAU/mL. Provocation will start with 100 BAU/mL, delivered as a 100 microliter puff into each nostril nose during breath holding, followed by expiration. Acoustic rhinometry, performed in each nostril, will be recorded at 15 minutes. A change of 30% from baseline in the composite score is considered significant. The dose will be increased every 20 minutes if there is no response. The concentrations used will be 100 BAU, 330 BAU, 1000 BAU, 3300 BAU, 10,000 BAU or 33,000 BAU/mL.
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Please refer to this study by its ClinicalTrials.gov identifier: NCT00554736
|Principal Investigator:||Fu-Tong Liu, MD, PhD||University of California, Davis|