Key result
In patients with COPD, inspiratory capacity decreased significantly by 15.8% at 40 breaths/min during incremental hyperventilation compared to a 3.3% decrease in healthy volunteers.
Why the study?
Can a newly developed spirometer quantitatively assess dynamic lung hyperinflation following incremental hyperventilation in patients with COPD?
Cross-Sectional (n=79)
No
Can a newly developed spirometer quantitatively assess dynamic lung hyperinflation following incremental hyperventilation in patients with COPD?
Absolute Event Rate: -15.8% vs -3.3%
p-value: p=<0.01
A newly developed spirometer can quantitatively assess dynamic lung hyperinflation following incremental hyperventilation, which correlates with exercise capacity in COPD patients.
Enables quantitative spirometric assessment of dynamic hyperinflation in COPD; leaves open its clinical utility pending prospective validation.
Objective This study was performed to determine the usefulness of a newly developed spirometer for the quantitative assessment of dynamic lung hyperinflation (DLH) following incremental hyperventilation in chronic obstructive pulmonary disease (COPD). Methods The subjects were 54 patients with COPD and 25 healthy volunteers. Each subject was asked to hyperventilate for 30 seconds with stepwise increments starting at the resting respiration rate and increasing to respiratory rates of 20, 30, and finally 40 breaths/min while using a newly developed spirometer. The relationship between the observed inspiratory capacity (IC) reduction following incremental hyperventilation as an index of DLH and spirometry or the 6-minute walking distance was examined. Results The IC did not decrease significantly from the resting IC, even when the respiratory rate was increased, in the healthy volunteer group. However, in the COPD patient group, the IC decreased with increases in the respiratory rate. Significant correlations were found between all IC parameters and the severity of COPD. A significant negative correlation was also found between the decreased IC and the 6-minute walking distance. Conclusion These findings suggest that the quantitative assessment of DLH following incremental hyperventilation using the newly developed spirometer may be useful for the assessment of pathophysiological impairment in patients with COPD.
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Kawachi et al. (2018) conducted a cross-sectional in Chronic Obstructive Pulmonary Disease (n=79). Metronome-paced incremental hyperventilation using a newly developed spirometer vs. Healthy volunteers was evaluated on Percentage change in inspiratory capacity at 40 breaths/min (ΔIC40) (p=<0.01). In patients with COPD, inspiratory capacity decreased significantly by 15.8% at 40 breaths/min during incremental hyperventilation compared to a 3.3% decrease in healthy volunteers.
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