CardioSoft - Jaken Medical...

Miscellaneous: Reference Value Equations, Interpretation Modes, Measurements
Curve typical of restriction?
Possible causes
reduced lung volume (restriction), elevated pulmonary
elasticity (fibrosis)
Criterion FVC Act. < xx % FVC Ref. and (VC MAX / (2 x MEF50) <
0.8)
Definition
Interpretative Statement
> 70 % normal*
50 ... 70 % curve typical of mild restriction
< 49 % curve typical of moderate to severe restriction
if < 70 %
further lung function measurement recommended
Expiratory stenoses?
Possible causes
Stenoses in the large airways, extrathoracic flow obstruction,
expiratory tracheal stenosis
Criterion FVC Act. / PEF > 0.8
Definition
Interpretative Statement
< 0,8 normal*
> 0,8 Further examination for extrathoracic flow obstruction and
expiratory tracheal stenosis recommended. Watch patient
cooperation.
* If all four interpretation criteria are normal, the interpretative
statement Normal lung function values is displayed.
Revision A CardioSoft B-17
2023324-053