Cosmed Quark PFT, Руководство пользователя

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146 - Quark PFT User Manual
Automatic diagnosis (algorithm)
Reference: “Lung Function Testing: selection of reference values and interpretative
strategies”, A.R.R.D., 144/ 1991:1202-1218.
LLN=Pred-0.674*SD (ATS, 50° percentile)
LLN=Pred-1.647*SD (ERS, 95° percentile)
LLN=Pred*0.8
(80%Pred)
Message interpretation Criterion
Normal Spirometry FVC and FEV1/FVC > LLN
Obstructive abnormality (it may be physiological) % Pred FEV1 >= 100
Obstructive abnormality: mild % Pred FEV1 < 100 and >= 70
Obstructive abnormality: moderate % Pred FEV1 < 70 and >= 60
Obstructive abnormality: moderately severe % Pred FEV1 < 60 and >= 50
Obstructive abnormality: severe % Pred FEV1 < 50 and >= 34
Obstructive abnormality: very severe % Pred FEV1 < 34
Restrictive abnormality: mild FVC < LLN and % Pred FVC >= 70
Restrictive abnormality: moderate % Pred FVC < 70 and >= 60
Restrictive abnormality: moderately severe % Pred FVC < 60 and >= 50
Restrictive abnormality: severe % Pred FVC < 50 and >= 34
Restrictive abnormality: very severe % Pred FVC < 34
Quality Control Messages
Reference : Spirometry in the Lung Health Study: Methods and Quality Control, ARRD
1991; 143:1215-1223.
Message Criterion
Start faster VEXT >5% of the FVC and >150ml
Blast out harder PEFT >120 msec
Avoid coughing 50% drop in the flow in first second
Blow out longer FET100% <6 sec.
Blow out more air flow >0.2l/s within 20 ml of FVC
Blow out harder dPEF<10%
Take a deeper breath dFVC<200ml and 5% best FVC
Blow out faster dFEV1<200ml and 5% FEV1
That was a good test No errors
FVC reproducible diff. 2 max FVC within 0.2 l
FEV1 reproducible diff. 2 max FEV1 within 0.2 l
PEF reproducible diff. 2 max PEF within 10 %
MVV time too short MVV time less than 12 sec