Investigation of intrinsic disturbance wave near the end of expiration
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Correlation with flowrate. If flowrate was defined between 0.3–0.5 1/s, definite IP was shown at the point when the mean flowrate ranged from more than 0.3 1/s to less than 0.3 1/s and the moment flowrate was 0.3 1/s in every examined case. From the data mentioned above CPV/VC % could be calculated.
Correlation with age.
Correlation with chronic obstructive pulmonary disease. This study also demonstrated that significant differences were found between the group of normal subjects, the groups of patients with chronic bronchitis, emphysema and chronic pulmonary heart disease and the group of other patients.
Key wordsintrinsic disturbance wave inflection point of intrinsic disturbance wave flowmeter with differentiator airway closing polygraph closing point volume
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