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Wheeze monitoring in children for assessment of nocturnal asthma and response to therapy

¹ Division of Paediatric Pulmonology, Rambam Medical Centre and ² Pulmonary Physiology Section, The Bruce Rappaport Faculty of Medicine at Technion - Israel Institute of Technology, Haifa, Israel

CORRESPONDENCE: N. Gavriely, Pulmonary Physiology Section, The Bruce Rappaport Faculty of Medicine, Technion - Israel Institute of Technology, P.O. Box 9697, Haifa, 31096, Israel. Fax: 972 48533185. E-mail: gavriely@tx.technion.ac.il

Keywords: asthma monitoring, automatic wheeze detection, breath sounds, leukotriene receptor antagonist, nocturnal asthma, pulmonary acoustics

Received: May 1, 2002
Accepted November 11, 2002

This study was funded in part by grants from Merck, Sharp & Dohme (MSD), Israel and by Karmel Medical Acoustic Technologies Ltd, Yokneam Illit, Israel.

The utilisation of nocturnal wheeze monitoring and quantification for assessment of asthma activity was studied in symptomatic school-aged children before and during treatment.

Twelve children 6–14 yrs of age with mild or moderate untreated asthma were studied at home three times: before, 48 h and 6 weeks into treatment with 5 mg montelukast daily. Lung sounds were recorded overnight by an automatic wheeze detection device (PulmoTrack®). Per cent wheezing within each respiratory cycle was calculated every 30 s throughout the night and a Nocturnal Wheeze Index (NWI) was calculated for the total night. The results were compared with spirometric indices (forced expiratory volume in one second (FEV₁), forced vital capacity), bronchial reactivity (provocative concentration causing a 20% fall in FEV₁ by adenosine 5'-monophosphate (PC₂₀)) and daily symptom scores, performed in parallel at each stage of the study.

The pretreatment NWI was 814±898 (mean±sd), which declined to 318±199 2 days after onset, and to 137±101 after 6 weeks of treatment. The NWI in seven healthy children was 47±43. The FEV₁, PC₂₀ and symptom scores improved in parallel.

Wheeze monitoring provides quantitative and noninvasive information about the extent of nocturnal wheezing in children, correlates well with conventional indices of asthma activity and can assist in assessing efficacy of treatment.

This article has been cited by other articles:

				L. Bentur, R. Beck, D. Berkowitz, J. Hasanin, I. Berger, N. Elias, and N. Gavriely Adenosine Bronchial Provocation With Computerized Wheeze Detection in Young Infants With Prolonged Cough: Correlation With Long-term Follow-up Chest, October 1, 2004; 126(4): 1060 - 1065. [Abstract] [Full Text] [PDF]