Leukotriene D4 Bronchial Provocation Test (LTD4-BPT) as an Indicator for the Use of Leukotriene Receptor Antagonist (LTRA)

NCT ID: NCT01414868

Last Updated: 2011-08-18

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: NA
• Total Enrollment: 32 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2010-03-31
• Study Completion Date: 2010-09-30

Brief Summary

Background: Therapeutic outcomes of leukotriene receptor antagonist (LTRA) vary in asthmatics，and there's not an ideal and simple way for prediction at present.

Objective：To investigate whether leukotriene D4 bronchial provocation test (LTD4-BPT) could be an indicator of actual therapeutic outcome of LTRA.

Methods：A single centre, open-labeled trial was performed in 32 asthmatics with positive LTD4-BPT result for a month. All subjects were categorized according to airway responsiveness to leukotriene D4（PD20FEV1-LTD4）. Subjects received montelukast therapy (10mg, once per night), and reassessment was performed (3~5) days after withholding LTRA. The primary end-point was the difference in monthly PEFR. Secondary endpoints included the difference in FENO, PD20FEV1-LTD4, PD20FEV1-MCh, pre-test FEV1, ACT score, AQLQ symptom score, week 4 PEFmax and PEFmin as compared with week 1, gradual decrease in the use of salbutamol and the days without using salbutamol.

Detailed Description

Our primary goal was to determine whether LTD4-BPT could be a clear indicator for assessing efficacy of LTRA. Logistic regression model was adopted for statistical analysis. In this model, pre-treatment PD20FEV1-LTD4 represented anticipated efficacy. The median of PD20FEV1-LTD4 was used for classification of asthmatics, with a lower figure representing a better anticipated outcome. Various variables, including the difference in pre- and post- treatment FENO, PEFmax, PEFmin, PEFR, PD20FEV1 and asthma scores, were introduced in the model representing the actual efficacy of LTRA. We aimed to test whether there would be certain parameters that assist prediction of anticipated outcome.

Conditions

Bronchial Asthma

Study Design

• Allocation Method: NON_RANDOMIZED
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: DIAGNOSTIC
• Blinding Strategy: NONE

Interventions

leukotriene receptor antagonist (montelukast)

montelukast (10 mg, once per night)

Intervention Type: DRUG

Other Intervention Names

singulair

Eligibility Criteria

Inclusion Criteria

• subjects aged between 18 and 65，without acute upper respiratory tract infection for the past 2 weeks
• had a normal chest radiographic result
• had a baseline spirometry with the forced expiratory volume in one second (FEV1) of not less than 60% predicted
• had withheld leukotriene receptor antagonists (LTRA) for over 5 days
• oral glucocorticosteroid or anti-histamine for 3 days
• oral xanthenes or long-acting bronchodilators for 2 days
• inhaled corticosteroid or long-acting bronchodilator for a day as well as short-acting bronchodilator for 4 hours prior to the measurement

Exclusion Criteria

• subjects had a fall of no less than 15% in FEV1 after repetitive forced respiration or a fall of no less than 20% in FEV1 after the inhalation of ethanol diluent control
• had a past confirmed history of respiratory disease other than bronchial asthma (COPD, bronchiectasis, pulmonary thromboembolism, etc.) or other severe systemic disease（myocardial infarction, malignant tumor, etc.）
• had a poor cooperation to the test or limited understandings, were immunocompromised, or had participated other clinical trials for the past 3 months.

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Guangzhou Institute of Respiratory Disease

OTHER

Sponsor Role: lead

Responsible Party

Guangzhou Institute of Respiratory Disease

Locations

The First Affiliated Hospital of Guangzhou Medical College

Guangzhou, Guangdong, China

Countries

China

References

Guan WJ, Shi X, Zheng JP, Gao Y, Jiang CY, Xie YQ, Liu QX, Zhu Z, Guo E, An JY, Yu XX, Liu WT, Zhong NS. Leukotriene D4 inhalation challenge for predicting short-term efficacy of montelukast: a pilot study. Clin Respir J. 2015 Jan;9(1):111-20. doi: 10.1111/crj.12117. Epub 2014 Mar 5.

Reference Type: DERIVED

PMID: 24506412 (View on PubMed)

Other Identifiers

LTD4-BPT20110806

Identifier Type: -

Identifier Source: org_study_id