Clinical trial NCT01963585: Evaluating the Capacity of High-sensitivity Serum CRP Levels to Predict Bronchial Hyper Responsiveness in School Age Children
Official title: Evaluating the Capacity of High-sensitivity Serum CRP Levels to Predict Bronchial Hyper Responsiveness in School Age Children
Study type: OBSERVATIONAL
Overall status: COMPLETED
Conditions: Hyperreactive Airway
Keywords: C reactive protein
Airway hyperreactivity
Body mass index
Lead sponsor: Rambam Health Care Campus
Sponsor class: OTHER
First posted: 2013-10-16
Enrollment: 131
Sex: ALL
Minimum age (years): 6
Maximum age (years): 18
Standard ages: CHILD
ADULT
Accepts healthy volunteers: yes
Observational model: COHORT
Time perspective: PROSPECTIVE
Sampling method: NON_PROBABILITY_SAMPLE
Study population: subjects (age range 6 to 18 years) referred for Methacholine Challenge Test (MCT)

Brief summary: Background:

Bronchial hyper responsiveness (BHR) assessed by methacholine challenge test (MCT) may aid in the diagnosis of asthma, while negative MCT can help to exclude the diagnosis. Laboratory measures that predict the results of MCT are expected to reduce the number of procedures. The possible capacity of High sensitive C-reactive protein (hs-CRP), a marker of systemic inflammation, to predict negative or positive MCT in children has not been evaluated.

Aim: to evaluate the capacity of hs-CRP to predict positive or negative MCT in school aged children and to compare it with markers of airway inflammation: Fractional exhaled Nitric Oxide (FeNO) and markers of allergic sensitization (IgE and peripheral blood eosinophils).

Design: Prospective study evaluating these parameters in patients with positive and negative MCT.

Participant selection: The study population included subjects (age range 6 to 18 years) referred for Methacholine Challenge Test (MCT)

Sample size: 130 participants in the two groups. Intervention: Each subject will undergo evaluation including a respiratory questionnaire, methacholine challenge test with determination of PC20(the provocative concentration that reduced FEV1 by 20% from baseline), exhaled nitric oxide (eNO). Venous blood will be analyzed for complete blood count + eosinophils, IGE levels, hs-CRP. All measurements will be evaluated in a single 3 hour visit, with no follow up study visits.

Primary end point: hs-CRP levels as add on tool to predict negative or positive MCT in children Secondary outcome parameters: All other parameters are the secondary end points.


Eligibility criteria: Inclusion Criteria:

* Age range 6 to 18 years
* Patient referred for Methacholine Challenge Test (MCT)

Exclusion Criteria:

* Base line FEV1(forced expiratory volume in the first second) \< 65%
* The presence of other systemic or lung disease
* Anti-inflammatory drugs
* Upper respiratory tract infection in the last month

Primary outcomes:
measure: HIgh sensitive C-reactive protein
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
Secondary outcomes:
measure: Metacholine Challenge Test
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
measure: IgE
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
measure: complete blood count
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
measure: Fractional Exhaled NO
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
measure: body mass index
timeFrame: participants will be followed for the duration of hospital visit, an average of 3 hours
Other outcomes:
Locations:
Study officials:
References:
citation: Livnat G, Yoseph RB, Nir V, Hakim F, Yigla M, Bentur L. Evaluation of high-sensitivity serum CRP levels compared to markers of airway inflammation and allergy as predictors of methacholine bronchial hyper-responsiveness in children. Lung. 2015 Feb;193(1):39-45. doi: 10.1007/s00408-014-9658-6. Epub 2014 Oct 21.