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Flashcards in PFTs Deck (37)
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31

How is DLCO measured?

SINGLE breath (requires inhaled VC of greater than 1 L and 10 of breath holding)

32

Interpreting DLCO

Change is DLCO 7% per gram of Hb

33

What is a normal DLCO?

81-140%
(76-80%- borderline)

34

What things can increase DLCO?

putting blood/Hb in the lungs (e.g. CHF, pulmonary hemorrhage)

35

What are the uses of DLCO?

-differentiate between asthma and COPD, or interstitial and chest wall disease

- diagnose pulmonary vascular disease

36

What things would show normal PFT and low DLCO?

pulmonary emboli or HTN

37

A negative methacholine challenge rules out ____

asthma (more than 20+% decrease with less than 1mg/ml methacholine in FEV1= hypersensitivity)