Airway Resistance in Asthma
Author Information
Author(s): Mendonça Nancy T, Kenyon Jennifer, LaPrad Adam S, Syeda Sohera N, O'Connor George T, Lutchen Kenneth R
Primary Institution: Boston University
Hypothesis
The minimal airway resistance achievable during a maximal inspiration (Rmin) is abnormally elevated in subjects with airway hyperresponsiveness.
Conclusion
Baseline Rmin is a useful measurement that can distinguish between asthmatic and nonasthmatic individuals and may serve as a clinical tool for assessing asthma.
Supporting Evidence
- Asthmatics had a higher baseline Rmin % predicted than nonasthmatic subjects.
- Baseline Rmin was able to identify subjects with airway hyperresponsiveness better than most spirometric indices.
- 100% of subjects with Rmin > 145% predicted had hyperresponsive airways.
Takeaway
This study found that people with asthma have a harder time opening their airways fully compared to those without asthma, which can help doctors understand and treat asthma better.
Methodology
Rmin was measured in 34 nonasthmatic and 35 asthmatic subjects using forced oscillations at 8 Hz, before and after bronchodilation and bronchoconstriction.
Potential Biases
The study may not reflect the full spectrum of asthma severity as it included only mild to moderate cases.
Limitations
The sample size was relatively small, the age range was limited, and most subjects were Caucasian, which may affect the generalizability of the results.
Participant Demographics
34 nonasthmatic and 35 asthmatic participants, mostly Caucasian, aged 18-29.
Statistical Information
P-Value
0.0004
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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