Asthma Clinical Trial
Official title:
An Association Between Asthma Severity and Capnography Parameters
Asthma is a common chronic disorder of the airways characterized by periods of reversible airflow obstruction known as asthma episodes or attacks. Asthma attacks are caused by chronically hyperactive (contraction of the muscles surrounding the airways) and inflamed airways, leading to airflow obstruction, and may be mild, moderate, or severe enough to become life-threatening events. Severity of asthma exacerbation is assessed through medical history and lung function measurements with Spirometer and requires full cooperation of the patient. Thus, in uncooperative populations or during emergency medical situations the spirometer cannot be used. As an alternative, capnography data has been proposed as an indicator of bronchospasm in asthma. Previous studies found correlations between the capnography parameters and methacholine challenge in asthma patients. However, the relationship between capnography parameters and severity of asthma or severity of asthma exacerbation have not been well characterized. The study hypothesis is that within the clinical population that is invited to do the methacholine challenge, a different waveform pattern in asthma patients will be detected and possibly a correlation between the severity of obstruction and pattern of waveform during the methacholine challenge. In this proposed feasibility observational study, sixty subjects, both men and women, who will be invited to participate in the methacholine challenge in the Institute of Pulmonary Medicine at Rabin Medical Center, will be recruited to the study. Respiratory information will be recorded using the CapnostreamTM20p while the subjects will wear the non-invasive Smart CapnoLine® Plus sampling line. Additionally, FeNO will be measured using a DENOX 88 device during the methacholine challenge.
n/a
Observational Model: Case Control, Time Perspective: Prospective
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