Abnormal Rv Tlc Ratio

Furthermore there was no correlation between fev1 reversibility and rv reversibility r 0 1 p 0 3 conclusions.

Abnormal rv tlc ratio.

A significant bronchodilator response was observed in 32 of the patients. Furthermore a recent study has reported abnormal rv tlc ratios even in presence of normal fev1 fvc ratios in patient with mild to moderate persistent asthma. Agreement and bias normal abnormal kappa bias p value plethysmography actual 40 40 79 5 yes 0 0006. An abnormal rv tlc ratio has been documented in adults with severe persistent asthma.

Then taking the ratio of observed and predicted intro duces an age related bias an undesirable feature. A positive correlation was observed between rv to age r 0 4 and height r 0 3. While fev1 improvement with bronchodilator may be a function of large airway reversibility lack of significant rv reversibility may indicate small airway closure that is non reversible. Adjustment of predicted value downward reduces the sensitivity of the test for detecting abnormality.

8 racial adjustment of predicted value most studies for normal values in us looked at caucasian populations of normals not apppp p g propriate for other ethnic groups if used in african american population more likely to seem abnormal 12 higher controversial. Abnormal rv tlc ratio was a superior criterion for diagnosing obstruction in asthma.