Conclusion
Both static hyperinflation and airflow limitation contributed
greatly to dyspnea in COPD patients. Our conclusion
does not support the hypothesis that the
perception of breathlessness in COPD is attributable to
static hyperinflation. One possible reason for this inconsistent
conclusion may be that different types of dyspnea
(clinical dyspnea vs. laboratory dyspnea) have been
assessed in previous investigations.